Moved node management code to a separate module to keep dependencies of implementation-node-runtime minimal.

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@672835 13f79535-47bb-0310-9956-ffa450edef68

4 files changed, 472 insertions, 0 deletions

diff --git a/java/sca/modules/node-manager/src/main/java/org/apache/tuscany/sca/implementation/node/manager/NodeManagerUtil.java b/java/sca/modules/node-manager/src/main/java/org/apache/tuscany/sca/implementation/node/manager/NodeManagerUtil.java
new file mode 100644
index 0000000000..8dfae91314
--- /dev/null
+++ b/java/sca/modules/node-manager/src/main/java/org/apache/tuscany/sca/implementation/node/manager/NodeManagerUtil.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.implementation.node.manager;
+
+/**
+ * Utility methods for node implementation launchers.
+ *
+ * @version $Rev$ $Date$
+ */
+public class NodeManagerUtil {
+
+    private static final String TUSCANY_DOMAIN = "TUSCANY_DOMAIN";
+    private static final String DEFAULT_DOMAIN = "http://localhost:9990";
+
+    /**
+     * Determine the URI of a node configuration. The domain URI can be configured
+     * using a TUSCANY_DOMAIN system property or environment variable.
+     * 
+     * @param nodeName
+     * @return
+     */
+    public static String nodeConfigurationURI(String nodeName) {
+        String domain = System.getProperty(TUSCANY_DOMAIN);
+        if (domain == null || domain.length() == 0) {
+            domain = System.getenv(TUSCANY_DOMAIN);
+        }
+        if (domain == null || domain.length() ==0) {
+            domain = DEFAULT_DOMAIN;
+        }
+        String nodeConfiguration = domain + "/node-config/" + nodeName;
+        return nodeConfiguration;
+    }
+    
+}
diff --git a/java/sca/modules/node-manager/src/main/java/org/apache/tuscany/sca/implementation/node/manager/NodeProcessCollectionImpl.java b/java/sca/modules/node-manager/src/main/java/org/apache/tuscany/sca/implementation/node/manager/NodeProcessCollectionImpl.java
new file mode 100644
index 0000000000..a1022d2677
--- /dev/null
+++ b/java/sca/modules/node-manager/src/main/java/org/apache/tuscany/sca/implementation/node/manager/NodeProcessCollectionImpl.java
@@ -0,0 +1,321 @@
+/*
+ * 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.implementation.node.manager;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Properties;
+import java.util.logging.Logger;
+
+import org.apache.tuscany.sca.data.collection.Entry;
+import org.apache.tuscany.sca.data.collection.Item;
+import org.apache.tuscany.sca.data.collection.ItemCollection;
+import org.apache.tuscany.sca.data.collection.LocalItemCollection;
+import org.apache.tuscany.sca.data.collection.NotFoundException;
+import org.apache.tuscany.sca.node.launcher.NodeLauncher;
+import org.osoa.sca.ServiceRuntimeException;
+import org.osoa.sca.annotations.Init;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+/**
+ * Implementation of a node process collection service. 
+ *
+ * @version $Rev$ $Date$
+ */
+@Scope("COMPOSITE")
+@Service(interfaces={ItemCollection.class, LocalItemCollection.class})
+public class NodeProcessCollectionImpl implements ItemCollection, LocalItemCollection {
+
+    private static final Logger logger = Logger.getLogger(NodeProcessCollectionImpl.class.getName());    
+
+    private List<SCANodeVM> nodeVMs = new ArrayList<SCANodeVM>();
+
+    /**
+     * Initialize the component.
+     */
+    @Init
+    public void initialize() {
+    }
+    
+    public Entry<String, Item>[] getAll() {
+        logger.fine("getAll");
+        
+        // Return all the running VMs
+        List<Entry<String, Item>> entries = new ArrayList<Entry<String, Item>>();
+        for (SCANodeVM vm: nodeVMs) {
+            entries.add(entry(vm));
+        }
+        return entries.toArray(new Entry[entries.size()]);
+    }
+
+    public Item get(String key) throws NotFoundException {
+        logger.fine("get " + key);
+
+        // Return the specified VM
+        SCANodeVM vm = vm(key);
+        if (vm == null) {
+            throw new NotFoundException();
+        }
+        
+        return item(vm);
+    }
+
+    public String post(String key, Item item) {
+        logger.fine("post " + key);
+
+        // If the VM is already running just return it
+        SCANodeVM vm = vm(key);
+        if (vm != null) {
+            if (vm.isAlive()) {
+                return key;
+            } else {
+                // Remove dead VM entry
+                try {
+                    vm.stop();
+                } catch (InterruptedException e) {
+                    throw new ServiceRuntimeException(e);
+                }
+                nodeVMs.remove(vm);
+            }
+        }
+
+        // Start a new VM and add it to the collection
+        vm = new SCANodeVM(key);
+        nodeVMs.add(0, vm);
+        try {
+            vm.start();
+        } catch (IOException e) {
+            throw new ServiceRuntimeException(e);
+        }
+        
+        return key;
+    }
+
+    public void put(String key, Item item) throws NotFoundException {
+        throw new UnsupportedOperationException();
+    }
+
+    public void delete(String key) throws NotFoundException {
+        logger.fine("delete " + key);
+        
+        // Stop a VM and remove it from the collection
+        SCANodeVM vm = vm(key);
+        if (vm != null) {
+            try {
+                vm.stop();
+            } catch (InterruptedException e) {
+                throw new ServiceRuntimeException(e);
+            }
+            nodeVMs.remove(vm);
+        } else {
+            //throw new NotFoundException();
+        }
+    }
+    
+    public Entry<String, Item>[] query(String queryString) {
+        logger.fine("query " + queryString);
+        
+        if (queryString.startsWith("node=")) {
+            
+            // Return the log for the specified VM
+            String key = queryString.substring(queryString.indexOf('=') + 1);
+            List<Entry<String, Item>> entries = new ArrayList<Entry<String, Item>>();
+            for (SCANodeVM vm: nodeVMs) {
+                if (vm.getNodeName().equals(key)) {
+                    entries.add(entry(vm));
+                }
+            }
+            return entries.toArray(new Entry[entries.size()]);
+            
+        } else {
+            throw new UnsupportedOperationException();
+        }
+    }
+    
+    /**
+     * Returns the specified VM.
+     * 
+     * @param key
+     * @return
+     */
+    private SCANodeVM vm(String key) {
+        for (SCANodeVM vm: nodeVMs) {
+            if (key.equals(vm.getNodeName())) {
+                return vm;
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Returns an entry representing a VM.
+     * 
+     * @param vm
+     * @return
+     */
+    private static Entry<String, Item> entry(SCANodeVM vm) {
+        Entry<String, Item> entry = new Entry<String, Item>();
+        entry.setKey(vm.getNodeName());
+        entry.setData(item(vm));
+        return entry;
+    }
+    
+    /**
+     * Returns an item representing a VM.
+     * 
+     * @param vm
+     * @return
+     */
+    private static Item item(SCANodeVM vm) {
+        Item item = new Item();
+        String key = vm.getNodeName();
+        item.setTitle(title(key));
+        item.setLink("/node-config/" + vm.getNodeName());
+        item.setContents("<span id=\"log\" style=\"white-space: nowrap; font-size: small\">" + vm.getLog().toString() + "</span>");
+        return item;
+    }
+    
+    /**
+     * Represent a child Java VM running an SCA node.
+     */
+    private static class SCANodeVM {
+        private String nodeName;
+        private StringBuffer log;
+        private Process process;
+        private Thread monitor;
+        private int status;
+        
+        SCANodeVM(String nodeName) {
+            log = new StringBuffer();
+            this.nodeName =nodeName;
+        }
+        
+        /**
+         * Starts a node in a new VM.
+         */
+        private void start() throws IOException {
+
+            // Determine the node configuration URI
+            String nodeConfigurationURI = NodeManagerUtil.nodeConfigurationURI(nodeName);
+            
+            // Build the Java VM command line
+            Properties props = System.getProperties();
+            String java = props.getProperty("java.home") + "/bin/java";
+            String cp = props.getProperty("java.class.path");
+            String main = NodeLauncher.class.getName();
+            final String[] command = new String[]{ java, "-cp", cp, main , nodeConfigurationURI};
+
+            logger.info("Starting " + "java " + main + " " + nodeConfigurationURI);
+            
+            // Start the VM
+            ProcessBuilder builder = new ProcessBuilder(command);
+            builder.redirectErrorStream(true);
+            process = builder.start();
+            
+            logger.info("Started " + process);
+            
+            // Start a thread to monitor the process
+            final BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
+            monitor = new Thread(new Runnable() {
+                public void run() {
+                    try {
+                        for (;;) {
+                            String s = reader.readLine();
+                            if (s != null) {
+                                logger.info(s);
+                                log.append(s + "<br>");
+                            } else {
+                                break;
+                            }
+                        }
+                        status = process.waitFor();
+                    } catch (IOException e) {
+                    } catch (Exception e) {
+                        throw new RuntimeException(e);
+                    }
+                }
+            });
+            monitor.start();
+        }
+
+        /**
+         * Returns the composite used to start this VM.
+         * @return
+         */
+        String getNodeName() {
+            return nodeName;
+        }
+        
+        /**
+         * Returns the log for this VM.
+         * 
+         * @return
+         */
+        StringBuffer getLog() {
+            return log;
+        }
+
+        /**
+         * Returns true if the VM is alive
+         * 
+         * @return
+         */
+        private boolean isAlive() {
+            return monitor.isAlive();
+        }
+        
+        /**
+         * Returns the VM status code.
+         * @return
+         */
+        int getStatus() {
+            return status;
+        }
+
+        /**
+         * Stops the VM.
+         * 
+         * @throws InterruptedException
+         */
+        private void stop() throws InterruptedException {
+            logger.info("Stopping " + process);
+            
+            process.destroy();
+            monitor.join();
+            
+            logger.info("Stopped " + process);
+        }
+    }
+    
+    /**
+     * Returns a node title.
+     * 
+     * @param key
+     * @return
+     */
+    private static String title(String key) {
+        return key;
+    }
+
+}
diff --git a/java/sca/modules/node-manager/src/main/java/org/apache/tuscany/sca/implementation/node/manager/PingServiceImpl.java b/java/sca/modules/node-manager/src/main/java/org/apache/tuscany/sca/implementation/node/manager/PingServiceImpl.java
new file mode 100644
index 0000000000..d0475e1dd3
--- /dev/null
+++ b/java/sca/modules/node-manager/src/main/java/org/apache/tuscany/sca/implementation/node/manager/PingServiceImpl.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.implementation.node.manager;
+
+import java.io.IOException;
+import java.util.logging.Logger;
+
+import javax.servlet.Servlet;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.xml.parsers.ParserConfigurationException;
+
+import org.osoa.sca.annotations.Init;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+/**
+ * Implementation of a ping service component.
+ *
+ * @version $Rev$ $Date$
+ */
+@Scope("COMPOSITE")
+@Service(interfaces={Servlet.class})
+public class PingServiceImpl extends HttpServlet {
+    private static final long serialVersionUID = -3477992129462720901L;
+
+    private static final Logger logger = Logger.getLogger(PingServiceImpl.class.getName());    
+
+    /**
+     * Initialize the component.
+     */
+    @Init
+    public void initialize() throws ParserConfigurationException {
+    }
+
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        logger.fine("ping");
+        response.getWriter().print("<html><body><span id=\"ping\">OK</span></body></html>");
+    }
+    
+}
diff --git a/java/sca/modules/node-manager/src/main/resources/NodeDaemon.composite b/java/sca/modules/node-manager/src/main/resources/NodeDaemon.composite
new file mode 100644
index 0000000000..cb587b02fd
--- /dev/null
+++ b/java/sca/modules/node-manager/src/main/resources/NodeDaemon.composite
@@ -0,0 +1,39 @@
+<?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.    
+-->
+<composite xmlns="http://www.osoa.org/xmlns/sca/1.0"
+	xmlns:t="http://tuscany.apache.org/xmlns/sca/1.0"
+	targetNamespace="http://tuscany.apache.org/xmlns/sca/1.0"
+    name="NodeDaemon">
+
+    <component name="NodeProcessCollectionComponent">
+        <implementation.java class="org.apache.tuscany.sca.implementation.node.manager.NodeProcessCollectionImpl"/>
+   		<service name="ItemCollection">
+   	 		<t:binding.atom uri="http://localhost:9990/node/processes" title="Log"/>
+   		</service>
+    </component>
+
+    <component name="PingServiceComponent">
+        <implementation.java class="org.apache.tuscany.sca.implementation.node.manager.PingServiceImpl"/>
+   		<service name="Servlet">
+   	 		<t:binding.http uri="http://localhost:9990/ping"/>
+   		</service>
+    </component>
+
+</composite>