1 files changed, 121 insertions, 0 deletions
diff --git a/sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/implementation/composite/CompositeComponentImpl.java b/sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/implementation/composite/CompositeComponentImpl.java
new file mode 100644
index 0000000000..8df05048c8
--- /dev/null
+++ b/sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/implementation/composite/CompositeComponentImpl.java
@@ -0,0 +1,121 @@
+/*
+ * 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.core.implementation.composite;
+
+import java.net.URI;
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.tuscany.spi.event.Event;
+import org.apache.tuscany.spi.extension.CompositeComponentExtension;
+import org.apache.tuscany.spi.wire.Wire;
+
+import org.apache.tuscany.core.component.event.ComponentStop;
+
+/**
+ * The standard implementation of a composite component. Autowiring is performed by delegating to the parent composite.
+ *
+ * @version $Rev$ $Date$
+ */
+public class CompositeComponentImpl extends CompositeComponentExtension {
+    public static final int DEFAULT_WAIT = 1000 * 60;
+    // Blocking latch to ensure the composite is initialized exactly once prior to servicing requests
+    protected CountDownLatch initializeLatch = new CountDownLatch(1);
+    protected final Object lock = new Object();
+    // Indicates whether the composite context has been initialized
+    protected boolean initialized;
+
+    /**
+     * Constructor
+     *
+     * @param name the name of this Component
+     */
+    public CompositeComponentImpl(URI name) {
+        super(name);
+    }
+
+    public void attachWire(Wire wire) {
+        throw new UnsupportedOperationException();
+    }
+
+    public void attachWires(List<Wire> wires) {
+        throw new UnsupportedOperationException();
+    }
+
+    public List<Wire> getWires(String name) {
+        throw new UnsupportedOperationException();
+    }
+
+    public void attachCallbackWire(Wire wire) {
+        throw new UnsupportedOperationException();
+    }
+
+    public void start() {
+        synchronized (lock) {
+            if (lifecycleState != UNINITIALIZED && lifecycleState != STOPPED) {
+                throw new IllegalStateException("Composite not in UNINITIALIZED state");
+            }
+            initializeLatch.countDown();
+            initialized = true;
+            lifecycleState = INITIALIZED;
+        }
+    }
+
+    public void stop() {
+        if (lifecycleState == STOPPED) {
+            return;
+        }
+
+        publish(new ComponentStop(this, getUri()));
+        // need to block a start until reset is complete
+        initializeLatch = new CountDownLatch(2);
+        lifecycleState = STOPPING;
+        initialized = false;
+        // allow initialized to be called
+        initializeLatch.countDown();
+        lifecycleState = STOPPED;
+    }
+
+    public void publish(Event event) {
+        if (lifecycleState == STOPPED) {
+            return;
+        }
+        checkInit();
+        super.publish(event);
+    }
+
+    /**
+     * Blocks until the composite context has been initialized
+     */
+    protected void checkInit() throws ComponentTimeoutException {
+        if (!initialized) {
+            try {
+                /* block until the composite has initialized */
+                boolean success = initializeLatch.await(DEFAULT_WAIT, TimeUnit.MILLISECONDS);
+                if (!success) {
+                    throw new ComponentTimeoutException("Timeout waiting for context to initialize");
+                }
+            } catch (InterruptedException e) { // should not happen
+            }
+        }
+
+    }
+
+}