Create 2.0 M4 release branch

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@830484 13f79535-47bb-0310-9956-ffa450edef68

6 files changed, 630 insertions, 0 deletions

diff --git a/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/DefaultResourceServlet.java b/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/DefaultResourceServlet.java
new file mode 100644
index 0000000000..3de0b9f5a7
--- /dev/null
+++ b/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/DefaultResourceServlet.java
@@ -0,0 +1,86 @@
+/*
+ * 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.host.http;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.URL;
+import java.net.URLDecoder;
+
+import javax.servlet.Servlet;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ * A minimal implementation of a Servlet that serves documents in a document root
+ * directory.
+ * 
+ * A Servlet host implementation is not required to use this implementation and can map
+ * the URI and document root to a more complete and more efficient implementation of  
+ * a resource Servlet, for example the Tomcat or Jetty default Servlets.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultResourceServlet extends HttpServlet implements Servlet {
+    private static final long serialVersionUID = 2865466417329430610L;
+    
+    private String documentRoot;
+    
+    /**
+     * Constructs a new ResourceServlet
+     * @param documentRoot the document root
+     */
+    public DefaultResourceServlet(String documentRoot) {
+        this.documentRoot = documentRoot;
+    }
+    
+    /**
+     * Returns the document root.
+     * @return the document root
+     */
+    public String getDocumentRoot() {
+        return documentRoot;
+    }
+
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        
+        // Determine the resource path
+        String path = URLDecoder.decode(request.getRequestURI().substring(request.getServletPath().length()), "UTF-8");
+        if (path.startsWith("/")) {
+            path = path.substring(1);
+        }
+        URL url = new URL(documentRoot + '/' + path);
+        
+        // Write the resource
+        InputStream is = url.openStream();
+        OutputStream os = response.getOutputStream(); 
+        byte[] buffer = new byte[2048];
+        for (;;) {
+            int n = is.read(buffer);
+            if (n <= 0)
+                break;
+            os.write(buffer, 0, n);
+        }
+    }
+}
diff --git a/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/DefaultServletHostExtensionPoint.java b/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/DefaultServletHostExtensionPoint.java
new file mode 100644
index 0000000000..d91485cbb5
--- /dev/null
+++ b/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/DefaultServletHostExtensionPoint.java
@@ -0,0 +1,198 @@
+/*
+ * 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.host.http;
+
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import javax.servlet.RequestDispatcher;
+import javax.servlet.Servlet;
+
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.LifeCycleListener;
+import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
+import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
+
+/**
+ * Default implementation of a Servlet host extension point.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class DefaultServletHostExtensionPoint implements ServletHostExtensionPoint, LifeCycleListener {
+
+    private List<ServletHost> servletHosts = new ArrayList<ServletHost>();
+    private boolean loaded;
+
+    private ExtensionPointRegistry registry;
+
+    public DefaultServletHostExtensionPoint(ExtensionPointRegistry registry) {
+        this.registry = registry;
+    }
+
+    public void addServletHost(ServletHost servletHost) {
+        servletHosts.add(servletHost);
+        if (servletHost instanceof LifeCycleListener) {
+            ((LifeCycleListener)servletHost).start();
+        }
+    }
+
+    public void removeServletHost(ServletHost servletHost) {
+        servletHosts.remove(servletHost);
+        if (servletHost instanceof LifeCycleListener) {
+            ((LifeCycleListener)servletHost).stop();
+        }
+    }
+
+    public List<ServletHost> getServletHosts() {
+        loadServletHosts();
+        return servletHosts;
+    }
+
+    private synchronized void loadServletHosts() {
+        if (loaded)
+            return;
+
+        // Get the databinding service declarations
+        Collection<ServiceDeclaration> sds;
+        try {
+            sds = ServiceDiscovery.getInstance().getServiceDeclarations(ServletHost.class, true);
+        } catch (IOException e) {
+            throw new IllegalStateException(e);
+        }
+
+        // Load data bindings
+        for (ServiceDeclaration sd : sds) {
+            // Create a data binding wrapper and register it
+            ServletHost servletHost = new LazyServletHost(sd);
+            addServletHost(servletHost);
+        }
+
+        loaded = true;
+    }
+
+    /**
+     * A data binding facade allowing data bindings to be lazily loaded and
+     * initialized.
+     */
+    public class LazyServletHost implements ServletHost, LifeCycleListener {
+        private ServiceDeclaration sd;
+        private ServletHost host;
+
+        /**
+         * @param sd
+         */
+        public LazyServletHost(ServiceDeclaration sd) {
+            super();
+            this.sd = sd;
+        }
+
+        public synchronized ServletHost getServletHost() {
+            if (host == null) {
+                try {
+                    Class<?> cls = sd.loadClass();
+                    Constructor<?> ctor = null;
+                    try {
+                        ctor = cls.getConstructor(ExtensionPointRegistry.class);
+                        host = (ServletHost)ctor.newInstance(registry);
+                    } catch (NoSuchMethodException e) {
+                        ctor = cls.getConstructor();
+                        host = (ServletHost)ctor.newInstance();
+                    }
+                    if(host instanceof LifeCycleListener) {
+                        ((LifeCycleListener) host).start();
+                    }
+                } catch (Throwable e) {
+                    throw new IllegalStateException(e);
+                }
+            }
+            return host;
+        }
+
+        public void addServletMapping(String uri, Servlet servlet) throws ServletMappingException {
+            getServletHost().addServletMapping(uri, servlet);
+        }
+
+        public String getContextPath() {
+            return getServletHost().getContextPath();
+        }
+
+        public int getDefaultPort() {
+            return getServletHost().getDefaultPort();
+        }
+
+        public RequestDispatcher getRequestDispatcher(String uri) throws ServletMappingException {
+            return getServletHost().getRequestDispatcher(uri);
+        }
+
+        public Servlet getServletMapping(String uri) throws ServletMappingException {
+            return getServletHost().getServletMapping(uri);
+        }
+
+        public URL getURLMapping(String uri) {
+            return getServletHost().getURLMapping(uri);
+        }
+
+        public Servlet removeServletMapping(String uri) throws ServletMappingException {
+            return getServletHost().removeServletMapping(uri);
+        }
+
+        public void setAttribute(String name, Object value) {
+            getServletHost().setAttribute(name, value);
+        }
+
+        public void setContextPath(String path) {
+            getServletHost().setContextPath(path);
+        }
+
+        public void setDefaultPort(int port) {
+            getServletHost().setDefaultPort(port);
+        }
+        
+        public String getName() {
+            return sd.getAttributes().get("name");
+        }
+
+        public void start() {
+        }
+
+        public void stop() {
+            if (host instanceof LifeCycleListener) {
+                ((LifeCycleListener)host).stop();
+            }
+        }
+    }
+
+    public void start() {
+    }
+
+    public void stop() {
+        for (ServletHost host : servletHosts) {
+            if (host instanceof LifeCycleListener) {
+                ((LifeCycleListener)host).stop();
+            }
+        }
+        servletHosts.clear();
+        registry = null;
+    }
+}
diff --git a/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/ExtensibleServletHost.java b/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/ExtensibleServletHost.java
new file mode 100644
index 0000000000..4dfa1dd8a3
--- /dev/null
+++ b/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/ExtensibleServletHost.java
@@ -0,0 +1,131 @@
+/*
+ * 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.host.http;
+
+import java.net.URL;
+
+import javax.servlet.RequestDispatcher;
+import javax.servlet.Servlet;
+
+/**
+ * Default implementation of an extensible Servlet host.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class ExtensibleServletHost implements ServletHost {
+    
+    private ServletHostExtensionPoint servletHosts;
+    
+    public ExtensibleServletHost(ServletHostExtensionPoint servletHosts) {
+        this.servletHosts = servletHosts;
+    }
+    
+    public void setDefaultPort(int port) {
+        if (servletHosts.getServletHosts().isEmpty()) {
+            throw new ServletMappingException("No servlet host available");
+        }
+
+        for (ServletHost servletHost: servletHosts.getServletHosts()) {
+            servletHost.setDefaultPort(port);
+        }
+    }
+    
+    private ServletHost getDefaultServletHost() {
+        return servletHosts.getServletHosts().get(0);
+    }
+    
+    public int getDefaultPort() {
+        if (servletHosts.getServletHosts().isEmpty()) {
+            throw new ServletMappingException("No servlet host available");
+        }
+
+        return getDefaultServletHost().getDefaultPort();
+    }
+
+    public void addServletMapping(String uri, Servlet servlet) throws ServletMappingException {
+        if (servletHosts.getServletHosts().isEmpty()) {
+            throw new ServletMappingException("No servlet host available");
+        }
+
+        // TODO implement selection of the correct Servlet host based on the mapping
+        // For now just select the first one
+        getDefaultServletHost().addServletMapping(uri, servlet);
+    }
+
+    public Servlet getServletMapping(String uri) throws ServletMappingException {
+        if (servletHosts.getServletHosts().isEmpty()) {
+            throw new ServletMappingException("No servlet host available");
+        }
+
+        // TODO implement selection of the correct Servlet host based on the mapping
+        // For now just select the first one
+        return getDefaultServletHost().getServletMapping(uri);
+    }
+    
+    public Servlet removeServletMapping(String uri) throws ServletMappingException {
+        if (servletHosts.getServletHosts().isEmpty()) {
+            throw new ServletMappingException("No servlet host available");
+        }
+
+        // TODO implement selection of the correct Servlet host based on the mapping
+        // For now just select the first one
+        return getDefaultServletHost().removeServletMapping(uri);
+    }
+    
+    public RequestDispatcher getRequestDispatcher(String uri) throws ServletMappingException {
+        if (servletHosts.getServletHosts().isEmpty()) {
+            throw new ServletMappingException("No servlet host available");
+        }
+
+        // TODO implement selection of the correct Servlet host based on the mapping
+        // For now just select the first one
+        return getDefaultServletHost().getRequestDispatcher(uri);
+    }
+
+    public String getContextPath() {
+        if (servletHosts.getServletHosts().isEmpty()) {
+            throw new ServletMappingException("No servlet host available");
+        }
+
+        // TODO implement selection of the correct Servlet host based on the mapping
+        // For now just select the first one
+        return getDefaultServletHost().getContextPath();
+    }
+    
+    public URL getURLMapping(String uri) {
+        if (servletHosts.getServletHosts().isEmpty()) {
+            throw new ServletMappingException("No servlet host available");
+        }
+
+        return getDefaultServletHost().getURLMapping(uri);
+    }
+
+    public void setContextPath(String path) {
+        getDefaultServletHost().setContextPath(path);
+    }
+
+    public void setAttribute(String name, Object value) {
+        getDefaultServletHost().setAttribute(name, value);
+    }
+    
+    public String getName() {
+        return getDefaultServletHost().getName();
+    }
+}
diff --git a/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/ServletHost.java b/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/ServletHost.java
new file mode 100644
index 0000000000..dffc1e73d4
--- /dev/null
+++ b/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/ServletHost.java
@@ -0,0 +1,120 @@
+/*
+ * 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.host.http;
+
+import java.net.URL;
+
+import javax.servlet.RequestDispatcher;
+import javax.servlet.Servlet;
+
+/**
+ * Interface implemented by host environments that allow Servlets to be
+ * registered. 
+ * <p/> 
+ * This interface allows a system service to register a Servlet
+ * to handle inbound requests.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface ServletHost {
+    
+    /**
+     * Sets the default port for the server.
+     * 
+     * @param port the default port
+     */
+    void setDefaultPort(int port);
+
+    /**
+     * Returns the default port for the server.
+     * 
+     * @return the default port
+     */
+    int getDefaultPort();
+    
+    /**
+     * Add a mapping for an instance of a Servlet. This requests that the
+     * Servlet container direct all requests to the designated mapping to the
+     * supplied Servlet instance.
+     * 
+     * @param uri the URI-mapping for the Servlet
+     * @param servlet the Servlet that should be invoked
+     * @throws ServletMappingException
+     */
+    void addServletMapping(String uri, Servlet servlet) throws ServletMappingException;
+
+    /**
+     * Remove a Servlet mapping. This directs the Servlet container not to direct
+     * any more requests to a previously registered Servlet.
+     * 
+     * @param uri the URI-mapping for the Servlet
+     * @return the Servlet that was registered to the mapping, null if nothing
+     *         was registered to the mapping
+     * @throws ServletMappingException
+     */
+    Servlet removeServletMapping(String uri) throws ServletMappingException;
+
+    /**
+     * Returns the Servlet mapped to the given URI.
+     * 
+     * @param uri the URI-mapping for the Servlet
+     * @return the Servlet registered with the mapping
+     * @throws ServletMappingException
+     */
+    Servlet getServletMapping(String uri) throws ServletMappingException;
+
+    /**
+     * Returns a Servlet request dispatcher for the Servlet mapped to the specified URI.
+     * 
+     * @param uri the URI mapped to a Servlet
+     * @return a RequestDispatcher that can be used to dispatch requests to
+     * that Servlet
+     * @throws ServletMappingException
+     */
+    RequestDispatcher getRequestDispatcher(String uri) throws ServletMappingException;
+
+    /**
+     * Returns the portion of the request URI that indicates the context of the request
+     * 
+     * @return a String specifying the portion of the request URI that indicates the context of the request
+     */
+    String getContextPath();
+
+    /**
+     * Sets the portion of the request URI that indicates the context of the request
+     * 
+     * @param path the context path
+     */
+    void setContextPath(String path);
+
+    /**
+     * Returns the complete URL mapped to the specified URI. 
+     * @return the URL mapped to the specified URI
+     */
+    URL getURLMapping(String uri);
+
+    /**
+     * Set an attribute in the application ServletContext 
+     * @param name the name of the attribute
+     * @param value the attribute value
+     */
+    void setAttribute(String name, Object value);
+    
+    String getName();
+}
diff --git a/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/ServletHostExtensionPoint.java b/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/ServletHostExtensionPoint.java
new file mode 100644
index 0000000000..fbd085ba2b
--- /dev/null
+++ b/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/ServletHostExtensionPoint.java
@@ -0,0 +1,51 @@
+/*
+ * 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.host.http;
+
+import java.util.List;
+
+/**
+ * An extension point for Servlet hosts.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface ServletHostExtensionPoint {
+
+    /**
+     * Adds a Servlet host extension.
+     * 
+     * @param servletHost
+     */
+    void addServletHost(ServletHost servletHost);
+
+    /**
+     * Removes a Servlet host extension.
+     * 
+     * @param servletHost
+     */
+    void removeServletHost(ServletHost servletHost);
+    
+    /**
+     * Returns a list of Servlet host extensions.
+     * 
+     * @return
+     */
+    List<ServletHost> getServletHosts();
+
+}
diff --git a/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/ServletMappingException.java b/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/ServletMappingException.java
new file mode 100644
index 0000000000..ae66c44c3e
--- /dev/null
+++ b/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/ServletMappingException.java
@@ -0,0 +1,44 @@
+/*
+ * 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.host.http;
+
+/**
+ * Indicates an exception while registering a Servlet mapping.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class ServletMappingException extends RuntimeException {
+    private static final long serialVersionUID = 1L;
+
+    public ServletMappingException() {
+        super();
+    }
+
+    public ServletMappingException(String message) {
+        super(message);
+    }
+
+    public ServletMappingException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public ServletMappingException(Throwable cause) {
+        super(cause);
+    }
+}