Copy trunk to beta2 release branch. (I've not yet changed the version so that would need to be done first before the branch is used)

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@1069272 13f79535-47bb-0310-9956-ffa450edef68

15 files changed, 1327 insertions, 0 deletions

diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/monitor/LICENSE b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/LICENSE
new file mode 100644
index 0000000000..8aa906c321
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/LICENSE
@@ -0,0 +1,205 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
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+      "License" shall mean the terms and conditions for use, reproduction,
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+      form, that is based on (or derived from) the Work and for which the
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+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
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+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
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+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
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+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
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+      institute patent litigation against any entity (including a
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+      or a Contribution incorporated within the Work constitutes direct
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+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
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+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
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+      (c) You must retain, in the Source form of any Derivative Works
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+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
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+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
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+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
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+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
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+      Work (including but not limited to damages for loss of goodwill,
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+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
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+   you may not use this file except in compliance with the License.
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+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
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+
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/monitor/META-INF/MANIFEST.MF b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/META-INF/MANIFEST.MF
new file mode 100644
index 0000000000..c9613cb52c
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/META-INF/MANIFEST.MF
@@ -0,0 +1,14 @@
+Manifest-Version: 1.0

+Export-Package: org.apache.tuscany.sca.monitor;version="2.0.0"

+Bundle-Name: Apache Tuscany SCA Monitor

+Bundle-Vendor: The Apache Software Foundation

+Bundle-Version: 2.0.0

+SCA-Version: 1.1

+Bundle-ManifestVersion: 2

+Bundle-License: http://www.apache.org/licenses/LICENSE-2.0.txt

+Bundle-Description: Apache Tuscany SCA Monitor

+Import-Package: org.apache.tuscany.sca.monitor;version="2.0.0"

+DynamicImport-Package: org.apache.tuscany.sca.*;version="2.0.0"

+Bundle-SymbolicName: org.apache.tuscany.sca.monitor

+Bundle-DocURL: http://www.apache.org/

+Bundle-RequiredExecutionEnvironment: J2SE-1.5,JavaSE-1.6
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/monitor/NOTICE b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/NOTICE
new file mode 100644
index 0000000000..d69e595698
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/NOTICE
@@ -0,0 +1,6 @@
+${pom.name}
+Copyright (c) 2005 - 2011 The Apache Software Foundation
+
+This product includes software developed by
+The Apache Software Foundation (http://www.apache.org/).
+
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/monitor/pom.xml b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/pom.xml
new file mode 100644
index 0000000000..e7e9ca9c15
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/pom.xml
@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+-->
+<project>
+
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.apache.tuscany.sca</groupId>
+        <artifactId>tuscany-modules</artifactId>
+        <version>2.0-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+
+    <artifactId>tuscany-monitor</artifactId>
+    <name>Apache Tuscany SCA Monitor</name>
+
+</project>
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/DefaultMonitorFactory.java b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/DefaultMonitorFactory.java
new file mode 100644
index 0000000000..8a99fa4c7c
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/DefaultMonitorFactory.java
@@ -0,0 +1,60 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.monitor;
+
+import org.apache.tuscany.sca.monitor.impl.MonitorImpl;
+
+/**
+ * A factory for creating validation monitors
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultMonitorFactory implements MonitorFactory {
+    private ThreadLocal<Monitor> contextMonitor = new InheritableThreadLocal<Monitor>();
+
+    public Monitor createMonitor() {
+        return new MonitorImpl();
+    }
+
+    public Monitor getContextMonitor() {
+        return contextMonitor.get();
+    }
+
+    public Monitor getContextMonitor(boolean create) {
+        Monitor monitor = contextMonitor.get();
+        if (monitor == null) {
+            monitor = new MonitorImpl();
+            setContextMonitor(monitor);
+        }
+        return monitor;
+    }
+
+    public Monitor removeContextMonitor() {
+        Monitor old = contextMonitor.get();
+        contextMonitor.remove();
+        return old;
+    }
+
+    public Monitor setContextMonitor(Monitor value) {
+        Monitor old = contextMonitor.get();
+        contextMonitor.set(value);
+        return old;
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/Monitor.java b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/Monitor.java
new file mode 100644
index 0000000000..3eda98ee23
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/Monitor.java
@@ -0,0 +1,364 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.monitor;
+
+import java.util.List;
+import java.util.logging.Logger;
+
+import org.apache.tuscany.sca.monitor.Problem.Severity;
+
+/**
+ * A monitor for the watching for validation problems
+ *
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.inheritfrom
+ */
+public abstract class Monitor {
+    private static class ContextFinder extends SecurityManager {
+        private final static ContextFinder instance = new ContextFinder();
+        
+        // This is sensitive to the calling stack
+        private static Class<?> getContextClass() {
+            Class[] classes = instance.getClassContext();
+            // 0: ContextFinder (getClassContext)
+            // 1: ContextFinder (getContextClass)
+            // 2: Monitor (getSourceClassName)
+            // 3: Monitor (error/warning)
+            return classes[4];
+        }
+        
+    }
+    private final static Logger logger = Logger.getLogger(Monitor.class.getName());
+
+    /**
+     * A utility function for raising an error. It creates the problem and 
+     * adds it to the monitor
+     * 
+     * @param monitor
+     * @param reportingObject
+     * @param messageBundle
+     * @param messageId
+     * @param messageParameters
+     */
+    public static void error (Monitor monitor, 
+                              Object reportingObject,
+                              String messageBundle,
+                              String messageId, 
+                              Object... messageParameters){
+        String contextClassName = getSourceClassName(reportingObject);
+        if (monitor != null) {
+            Problem problem =
+                monitor.createProblem(contextClassName,
+                                      messageBundle,
+                                      Severity.ERROR,
+                                      reportingObject,
+                                      messageId,
+                                      messageParameters);
+            monitor.problem(problem);
+        } else {
+            logNullMonitor(messageId, contextClassName);
+        }
+    }
+
+    /**
+     * A utility function for raising an error. It creates the problem and 
+     * adds it to the monitor
+     * 
+     * @param monitor
+     * @param reportingObject
+     * @param messageBundle
+     * @param messageId
+     * @param exception
+     */
+    public static void error (Monitor monitor, 
+                              Object reportingObject,
+                              String messageBundle,
+                              String messageId, 
+                              Throwable cause){
+        String contextClassName = getSourceClassName(reportingObject);
+        if (monitor != null) {
+            Problem problem =
+                monitor.createProblem(contextClassName,
+                                      messageBundle,
+                                      Severity.ERROR,
+                                      reportingObject,
+                                      messageId,
+                                      cause);
+            monitor.problem(problem);
+        } else {
+            logNullMonitor(messageId, contextClassName);
+        }
+    }
+
+    /**
+     * A utility function for raising an error. It creates the problem and 
+     * adds it to the monitor
+     * 
+     * @param monitor
+     * @param reportingObject
+     * @param messageBundle
+     * @param messageId
+     * @param exception
+     */
+    public static void error (Monitor monitor, 
+                              Object reportingObject,
+                              String messageBundle,
+                              String messageId, 
+                              Throwable cause,
+                              Object... messageParameters) {
+        String contextClassName = getSourceClassName(reportingObject);
+        if (monitor != null) {
+            Problem problem =
+                monitor.createProblem(contextClassName,
+                                      messageBundle,
+                                      Severity.ERROR,
+                                      reportingObject,
+                                      messageId,
+                                      cause,
+                                      messageParameters);
+            monitor.problem(problem);
+        } else {
+            logNullMonitor(messageId, contextClassName);
+        }
+    }
+
+    private static String getSourceClassName(Object reportingObject) {
+        String contextClassName = null;
+        if (reportingObject != null) {
+            contextClassName = reportingObject.getClass().getName();
+        } else {
+            contextClassName = ContextFinder.getContextClass().getName();
+        }
+        return contextClassName;
+    }
+
+    private static void logNullMonitor(String messageId, String contextClassName) {
+        logger.warning("Attempt to report error with id " + 
+                messageId + 
+                " from class " + 
+                contextClassName +
+                " but the monitor object was null");
+    }
+
+    /**
+     * A utility function for raising a warning. It creates the problem and 
+     * adds it to the monitor
+     * 
+     * @param monitor
+     * @param reportingObject
+     * @param messageBundle
+     * @param messageId
+     * @param messageParameters
+     */
+    public static void warning (Monitor monitor, 
+                                Object reportingObject,
+                                String messageBundle,
+                                String messageId, 
+                                Object... messageParameters){
+        String contextClassName = getSourceClassName(reportingObject);
+        if (monitor != null) {
+            Problem problem =
+                monitor.createProblem(contextClassName,
+                                      messageBundle,
+                                      Severity.WARNING,
+                                      reportingObject,
+                                      messageId,
+                                      messageParameters);
+            monitor.problem(problem);
+        } else {
+            logNullMonitor(messageId, contextClassName);
+        }
+    }
+    
+    // =====================================================
+    // TUSCANY-3132 - new approach to monitoring errors
+    //           
+    
+    /**
+     * A utility function for raising an error. It creates the problem and 
+     * adds it to the monitor
+     * 
+     * @param monitor
+     * @param reportingObject
+     * @param messageBundle
+     * @param messageId
+     * @param exception
+     */
+    public static void warning (Monitor monitor, 
+                              Object reportingObject,
+                              String messageBundle,
+                              String messageId, 
+                              Throwable cause){
+        String contextClassName = getSourceClassName(reportingObject);
+        if (monitor != null) {
+            Problem problem =
+                monitor.createProblem(contextClassName,
+                                      messageBundle,
+                                      Severity.WARNING,
+                                      reportingObject,
+                                      messageId,
+                                      cause);
+            monitor.problem(problem);
+        } else {
+            logNullMonitor(messageId, contextClassName);
+        }
+    }
+    
+    /**
+     * A utility function for raising an error. It creates the problem and 
+     * adds it to the monitor
+     * 
+     * @param monitor
+     * @param reportingObject
+     * @param messageBundle
+     * @param messageId
+     * @param exception
+     */
+    public static void warning (Monitor monitor, 
+                              Object reportingObject,
+                              String messageBundle,
+                              String messageId, 
+                              Throwable cause,
+                              Object... messageParameters) {
+        String contextClassName = getSourceClassName(reportingObject);
+        if (monitor != null) {
+            Problem problem =
+                monitor.createProblem(contextClassName,
+                                      messageBundle,
+                                      Severity.WARNING,
+                                      reportingObject,
+                                      messageId,
+                                      cause,
+                                      messageParameters);
+            monitor.problem(problem);
+        } else {
+            logNullMonitor(messageId, contextClassName);
+        }
+    }
+    
+    /**
+     * Create a new problem.
+     *  
+     * @param sourceClassName   the class name reporting the problem
+     * @param bundleName        the name of the message bundle to use
+     * @param severity          the severity of the problem
+     * @param problemObject     the model object for which the problem is being reported
+     * @param messageId         the id of the problem message
+     * @param messageParams     the parameters of the problem message
+     * @return
+     */
+    public abstract Problem createProblem(String sourceClassName,
+                                   String bundleName,
+                                   Severity severity,
+                                   Object problemObject,
+                                   String messageId,
+                                   Object... messageParams);
+    
+    /**
+     * Create a new problem.
+     * 
+     * @param sourceClassName   the class name reporting the problem
+     * @param bundleName        the name of the message bundle to use
+     * @param severity          the severity of the problem
+     * @param problemObject     the model object for which the problem is being reported
+     * @param messageId         the id of the problem message
+     * @param cause             the exception which caused the problem
+     * @return
+     */
+    public abstract Problem createProblem(String sourceClassName,
+                                          String bundleName,
+                                          Severity severity,
+                                          Object problemObject,
+                                          String messageId,
+                                          Throwable cause);
+
+    /**
+     * Get the name of the artifact for which errors are Monitored
+     * @return the name of the Artifact or null if no artifact name has been set
+     */
+    public abstract String getArtifactName();
+
+    /**
+     * Returns the last logged problem.
+     * 
+     * @return
+     */
+    public abstract Problem getLastProblem();
+   
+    /** 
+     * Returns a list of reported problems. 
+     * 
+     * @return the list of problems. The list may be empty
+     */
+    public abstract List<Problem> getProblems();
+
+    /**
+     * Remove the most recent context string from the 
+     * context stack
+     * @return The object popped 
+     */
+    public abstract Object popContext();
+
+    /**
+     * Reports a build problem.
+     * 
+     * @param problem
+     */
+    public abstract void problem(Problem problem);
+    
+    /**
+     * Add a context string to the context stack
+     * @param context the context string to add
+     */
+    public abstract void pushContext(Object context);
+    
+    /**
+     * Clear context and problems
+     */
+    public abstract void reset();    
+    /**
+     * Set the name of an artifact for which errors are Monitored
+     * @param artifactName the artifact name
+     */
+    public abstract void setArtifactName(String artifactName);
+    
+    // =====================================================
+
+    /**
+     * Checks the Monitor for any Problems with s severity of ERROR and
+     * if one is found then throw a ValidationException.
+     * This will also call reset() on this Monitor.
+     */
+    public void analyzeProblems() throws ValidationException {
+        try {
+            for (Problem problem : getProblems()) {
+                if ((problem.getSeverity() == Severity.ERROR)) {
+                    if (problem.getCause() != null) {
+                        throw new ValidationException(problem.getCause());
+                    } else {
+                        throw new ValidationException(problem.toString());
+                    }
+                }
+            }
+        } finally {
+            reset();
+        }
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/MonitorFactory.java b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/MonitorFactory.java
new file mode 100644
index 0000000000..12ac7eba7b
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/MonitorFactory.java
@@ -0,0 +1,61 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.monitor;
+
+
+/**
+ * A factory for validation monitors
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface MonitorFactory {
+
+    /**
+     * Create a new monitor.
+     * 
+     * @return a new monitor
+     */
+    Monitor createMonitor();
+
+    /**
+     * Get the monitor instance on the thread
+     * @return the monitor instance on the thread
+     */
+    Monitor getContextMonitor();
+
+    /**
+     * Get the monitor instance on the thread
+     * @param create if it true, then create a new instance if no monitor is on the thread 
+     * @return the monitor instance on the thread
+     */
+    Monitor getContextMonitor(boolean create);
+
+    /**
+     * Remove the monitor on the thread
+     * @return The existing instance
+     */
+    Monitor removeContextMonitor();
+
+    /**
+     * Set the monitor onto the thread
+     * @param value The new instance
+     * @return The old instance
+     */
+    Monitor setContextMonitor(Monitor monitor);
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/Problem.java b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/Problem.java
new file mode 100644
index 0000000000..c05fa632fb
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/Problem.java
@@ -0,0 +1,54 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.monitor;
+
+/**
+ * Records an validation problem. 
+ *
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.asclient
+ */
+public interface Problem {
+
+	/**
+	 * 
+	 * @tuscany.spi.extension
+	 *
+	 */
+    public enum Severity {
+        INFO, WARNING, ERROR
+    }
+
+    String getSourceClassName();
+
+    String getResourceBundleName();
+
+    Severity getSeverity();
+    
+    String getContext();
+
+    Object getProblemObject();
+
+    String getMessageId();
+
+    Throwable getCause();
+
+    Object[] getMessageParams();
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/ValidationException.java b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/ValidationException.java
new file mode 100644
index 0000000000..368893dd68
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/ValidationException.java
@@ -0,0 +1,40 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.monitor;
+
+public class ValidationException extends Exception {
+    private static final long serialVersionUID = 1L;
+
+    public ValidationException() {
+        super();
+    }
+
+    public ValidationException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public ValidationException(String message) {
+        super(message);
+    }
+
+    public ValidationException(Throwable cause) {
+        super(cause);
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/impl/MonitorImpl.java b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/impl/MonitorImpl.java
new file mode 100644
index 0000000000..c81581aae0
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/impl/MonitorImpl.java
@@ -0,0 +1,144 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.monitor.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Stack;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.Problem;
+import org.apache.tuscany.sca.monitor.Problem.Severity;
+
+/**
+ * A monitor for the watching for validation problems
+ *
+ * @version $Rev$ $Date$
+ */
+public class MonitorImpl extends Monitor {
+    private static final Logger logger = Logger.getLogger(MonitorImpl.class.getName());
+    
+    // stack of context information that is printed alongside each problem
+    private Stack<Object> contextStack = new Stack<Object>();
+
+    // Cache all the problem reported to monitor for further analysis
+    private List<Problem> problemCache = new ArrayList<Problem>();
+
+    // Name of an artifact for which problems are being Monitored
+    private String artifactName = null;
+
+    public void problem(Problem problem) {
+
+        Logger problemLogger = Logger.getLogger(problem.getSourceClassName(), problem.getResourceBundleName());
+
+        if (problemLogger == null) {
+            logger.severe("Can't get logger " + problem.getSourceClassName()
+                + " with bundle "
+                + problem.getResourceBundleName());
+        }
+
+        if (problem.getSeverity() == Severity.INFO) {
+            problemCache.add(problem);
+            problemLogger.logp(Level.INFO, problem.getSourceClassName(), problem.getContext(), problem.getMessageId(), problem
+                .getMessageParams());
+        } else if (problem.getSeverity() == Severity.WARNING) {
+            problemCache.add(problem);
+            problemLogger.logp(Level.WARNING, problem.getSourceClassName(), problem.getContext(), problem.getMessageId(), problem
+                .getMessageParams());
+        } else if (problem.getSeverity() == Severity.ERROR) {
+            if (problem.getCause() != null) {
+                problemCache.add(problem);
+                problemLogger.logp(Level.SEVERE, problem.getSourceClassName(), problem.getContext(), problem.getMessageId(), problem
+                    .getCause());
+
+            } else {
+                problemCache.add(problem);
+                problemLogger.logp(Level.SEVERE, problem.getSourceClassName(), problem.getContext(), problem.getMessageId(), problem
+                    .getMessageParams());
+            }
+        }
+    }
+
+    public List<Problem> getProblems() {
+        return problemCache;
+    }
+
+    public Problem getLastProblem() {
+        if (problemCache.isEmpty()) {
+            return null;
+        }
+        return problemCache.get(problemCache.size() - 1);
+    }
+
+    public Problem createProblem(String sourceClassName,
+                                 String bundleName,
+                                 Severity severity,
+                                 Object problemObject,
+                                 String messageId,
+                                 Throwable cause) {
+        return new ProblemImpl(sourceClassName, bundleName, severity, contextStack.toString(), problemObject, messageId, cause);
+    }
+
+    public Problem createProblem(String sourceClassName,
+                                 String bundleName,
+                                 Severity severity,
+                                 Object problemObject,
+                                 String messageId,
+                                 Object... messageParams) {
+        return new ProblemImpl(sourceClassName, bundleName, severity, contextStack.toString(), problemObject, messageId, messageParams);
+    }
+    
+    public Problem createProblem(String sourceClassName,
+                                 String bundleName,
+                                 Severity severity,
+                                 Object problemObject,
+                                 String messageId,
+                                 Throwable cause,
+                                 Object... messageParams) {
+        return new ProblemImpl(sourceClassName, bundleName, severity, contextStack.toString(), problemObject, messageId, cause, messageParams);
+    }
+
+    public String getArtifactName() {
+        return artifactName;
+    }
+
+    public void setArtifactName(String artifactName) {
+        this.artifactName = artifactName;
+    }
+    
+    @Override
+    public void pushContext(Object context) {
+        contextStack.push(context);
+    }
+    
+    @Override
+    public Object popContext() {
+        return contextStack.pop();
+    }
+    
+    @Override
+    public void reset() {
+        contextStack.clear();
+        problemCache.clear();
+        artifactName = null;
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/impl/ProblemImpl.java b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/impl/ProblemImpl.java
new file mode 100644
index 0000000000..acfc409856
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/java/org/apache/tuscany/sca/monitor/impl/ProblemImpl.java
@@ -0,0 +1,181 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.monitor.impl;
+
+import java.util.logging.Formatter;
+import java.util.logging.Level;
+import java.util.logging.LogRecord;
+import java.util.logging.Logger;
+import java.util.logging.SimpleFormatter;
+
+import org.apache.tuscany.sca.monitor.Problem;
+
+/**
+ * Reports a composite assembly problem. 
+ *
+ * @version $Rev$ $Date$
+ */
+public class ProblemImpl implements Problem {
+
+    private String sourceClassName;
+    private String bundleName;
+    private Severity severity;
+    private String context;
+    private Object problemObject;
+    private String messageId;
+    private Object[] messageParams;
+    private Throwable cause;
+
+    /**
+     * Construct a new problem
+     * 
+     * @param sourceClassName   the class name reporting the problem
+     * @param bundleName        the name of the message bundle to use
+     * @param severity          the severity of the problem
+     * @param context           the string indicating where the error occurred
+     * @param problemObject     the model object for which the problem is being reported
+     * @param messageId         the id of the problem message
+     * @param messageParams     the parameters of the problem message
+     */
+    public ProblemImpl(String sourceClassName,
+                       String bundleName,
+                       Severity severity,
+                       String context,
+                       Object problemObject,
+                       String messageId,
+                       Object... messageParams) {
+        this.sourceClassName = sourceClassName;
+        this.bundleName = bundleName;
+        this.severity = severity;
+        this.context = context;
+        this.problemObject = problemObject;
+        this.messageId = messageId;
+        this.messageParams = messageParams;
+    }
+
+    /**
+     * Construct a new problem
+     * 
+     * @param sourceClassName   the class name reporting the problem
+     * @param bundleName        the name of the message bundle to use
+     * @param severity          the severity of the problem
+     * @param context           the string indicating where the error occurred
+     * @param problemObject     the model object for which the problem is being reported
+     * @param messageId         the id of the problem message
+     * @param messageParams     the parameters of the problem message
+     */
+    public ProblemImpl(String sourceClassName,
+                       String bundleName,
+                       Severity severity,
+                       String context,
+                       Object problemObject,
+                       String messageId,
+                       Throwable cause,
+                       Object... messageParams) {
+        this.sourceClassName = sourceClassName;
+        this.bundleName = bundleName;
+        this.severity = severity;
+        this.context = context;
+        this.problemObject = problemObject;
+        this.messageId = messageId;
+        this.cause = cause;
+        this.messageParams = messageParams;
+    }    
+    /**
+     * Construct a new problem
+     * 
+     * @param sourceClassName   the class name reporting the problem
+     * @param bundleName        the name of the message bundle to use
+     * @param severity          the severity of the problem
+     * @param context           the string indicating where the error occurred
+     * @param problemObject     the model object for which the problem is being reported
+     * @param messageId         the id of the problem message
+     * @param cause             the exception which caused the problem
+     */
+    public ProblemImpl(String sourceClassName,
+                       String bundleName,
+                       Severity severity,
+                       String context,
+                       Object problemObject,
+                       String messageId,
+                       Throwable cause) {
+        this.sourceClassName = sourceClassName;
+        this.bundleName = bundleName;
+        this.severity = severity;
+        this.context = context;
+        this.problemObject = problemObject;
+        this.messageId = messageId;
+        this.cause = cause;
+    }
+
+    public String getSourceClassName() {
+        return sourceClassName;
+    }
+
+    public String getResourceBundleName() {
+        return bundleName;
+    }
+
+    public Severity getSeverity() {
+        return severity;
+    }
+    
+    public String getContext() {
+        return context + " (" + messageId + ")"; 
+    }
+
+    public Object getProblemObject() {
+        return problemObject;
+    }
+
+    public String getMessageId() {
+        return messageId;
+    }
+
+    public Object[] getMessageParams() {
+        return messageParams;
+    }
+
+    public Throwable getCause() {
+        return cause;
+    }
+
+    @Override
+    public String toString() {
+        Logger logger = Logger.getLogger(sourceClassName, bundleName);
+
+        LogRecord record = new LogRecord(Level.INFO, messageId);
+
+        if (cause == null) {
+            record.setParameters(messageParams);
+
+        } else {
+            Object[] params = new String[1];
+            params[0] = cause.toString();
+            record.setParameters(params);
+        }
+        record.setResourceBundle(logger.getResourceBundle());
+        record.setSourceClassName(sourceClassName);
+
+        Formatter formatter = new SimpleFormatter();
+
+        return context + " - " + formatter.formatMessage(record);
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/resources/META-INF/services/org.apache.tuscany.sca.monitor.MonitorFactory b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/resources/META-INF/services/org.apache.tuscany.sca.monitor.MonitorFactory
new file mode 100644
index 0000000000..f2c2a52e78
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/main/resources/META-INF/services/org.apache.tuscany.sca.monitor.MonitorFactory
@@ -0,0 +1,19 @@
+# Licensed to the Apache Software Foundation (ASF) under one

+# or more contributor license agreements.  See the NOTICE file

+# distributed with this work for additional information

+# regarding copyright ownership.  The ASF licenses this file

+# to you under the Apache License, Version 2.0 (the

+# "License"); you may not use this file except in compliance

+# with the License.  You may obtain a copy of the License at

+# 

+#   http://www.apache.org/licenses/LICENSE-2.0

+# 

+# Unless required by applicable law or agreed to in writing,

+# software distributed under the License is distributed on an

+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

+# KIND, either express or implied.  See the License for the

+# specific language governing permissions and limitations

+# under the License. 

+

+org.apache.tuscany.sca.monitor.DefaultMonitorFactory

+

diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/test/java/org/apache/tuscany/sca/monitor/MonitorTestCase.java b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/test/java/org/apache/tuscany/sca/monitor/MonitorTestCase.java
new file mode 100644
index 0000000000..6e44b2d5d9
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/test/java/org/apache/tuscany/sca/monitor/MonitorTestCase.java
@@ -0,0 +1,98 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.monitor;
+
+import org.apache.tuscany.sca.monitor.Problem.Severity;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+/**
+ * Loads a monitor and adds some problems to it.
+ *
+ * @version $Rev$ $Date$
+ */
+public class MonitorTestCase {
+
+    private static final String MESSAGES = "org.apache.tuscany.sca.monitor.tuscany-monitor-test-messages";
+    private static MonitorFactory monitorFactory;
+
+    @BeforeClass
+    public static void init() throws Exception {
+        monitorFactory = new DefaultMonitorFactory();
+    }
+
+    @AfterClass
+    public static void destroy() throws Exception {
+        monitorFactory = null;
+    }
+
+    @Test
+    public void testCreateProblem() throws Exception {
+        String dummyModelObject = "DUMMY MODEL OBJECT";
+
+        Monitor monitor = monitorFactory.createMonitor();
+
+        Problem problem = null;
+
+        problem =
+            monitor.createProblem(this.getClass().getName(),
+                                  MESSAGES,
+                                  Severity.WARNING,
+                                  dummyModelObject,
+                                  "MESSAGE1");
+        monitor.problem(problem);
+
+        String param = "Some Parameter";
+
+        problem =
+            monitor.createProblem(this.getClass().getName(),
+                                  MESSAGES,
+                                  Severity.WARNING,
+                                  dummyModelObject,
+                                  "MESSAGE2",
+                                  param);
+        monitor.problem(problem);
+
+        problem =
+            monitor.createProblem(this.getClass().getName(),
+                                  MESSAGES,
+                                  Severity.WARNING,
+                                  dummyModelObject,
+                                  "MESSAGE3",
+                                  8,
+                                  9,
+                                  4);
+        monitor.problem(problem);
+
+        Exception ex = new IllegalStateException("TEST_MESSAGE");
+
+        problem =
+            monitor.createProblem(this.getClass().getName(),
+                                  MESSAGES,
+                                  Severity.ERROR,
+                                  dummyModelObject,
+                                  "MESSAGE4",
+                                  ex);
+        monitor.problem(problem);
+
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/test/resources/org/apache/tuscany/sca/monitor/tuscany-monitor-test-messages.properties b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/test/resources/org/apache/tuscany/sca/monitor/tuscany-monitor-test-messages.properties
new file mode 100644
index 0000000000..523263da40
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/test/resources/org/apache/tuscany/sca/monitor/tuscany-monitor-test-messages.properties
@@ -0,0 +1,24 @@
+#
+#
+#    Licensed to the Apache Software Foundation (ASF) under one
+#    or more contributor license agreements. See the NOTICE file
+#    distributed with this work for additional information
+#    regarding copyright ownership. The ASF licenses this file
+#    to you under the Apache License, Version 2.0 (the
+#    "License"); you may not use this file except in compliance
+#    with the License. You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing,
+#    software distributed under the License is distributed on an
+#    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+#    KIND, either express or implied. See the License for the
+#    specific language governing permissions and limitations
+#    under the License.
+#
+#
+MESSAGE1 = This is a test message with no params
+MESSAGE2 = This is a test message with a string param {0}
+MESSAGE3 = This is a test message with numbers {0}, {1}, {2}
+MESSAGE4 = This is a test message with exception 
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/test/resources/org/apache/tuscany/sca/monitor/tuscany-monitor-test-messages_it.properties b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/test/resources/org/apache/tuscany/sca/monitor/tuscany-monitor-test-messages_it.properties
new file mode 100644
index 0000000000..523263da40
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/monitor/src/test/resources/org/apache/tuscany/sca/monitor/tuscany-monitor-test-messages_it.properties
@@ -0,0 +1,24 @@
+#
+#
+#    Licensed to the Apache Software Foundation (ASF) under one
+#    or more contributor license agreements. See the NOTICE file
+#    distributed with this work for additional information
+#    regarding copyright ownership. The ASF licenses this file
+#    to you under the Apache License, Version 2.0 (the
+#    "License"); you may not use this file except in compliance
+#    with the License. You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing,
+#    software distributed under the License is distributed on an
+#    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+#    KIND, either express or implied. See the License for the
+#    specific language governing permissions and limitations
+#    under the License.
+#
+#
+MESSAGE1 = This is a test message with no params
+MESSAGE2 = This is a test message with a string param {0}
+MESSAGE3 = This is a test message with numbers {0}, {1}, {2}
+MESSAGE4 = This is a test message with exception