1 files changed, 82 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/java-stable-20060304/sca/core/src/main/java/org/apache/tuscany/core/system/context/SystemExternalServiceContext.java b/sca-java-1.x/tags/java-stable-20060304/sca/core/src/main/java/org/apache/tuscany/core/system/context/SystemExternalServiceContext.java
new file mode 100644
index 0000000000..9b09cea082
--- /dev/null
+++ b/sca-java-1.x/tags/java-stable-20060304/sca/core/src/main/java/org/apache/tuscany/core/system/context/SystemExternalServiceContext.java
@@ -0,0 +1,82 @@
+/**
+ * 
+ * Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
+ * 
+ * Licensed 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.system.context;
+
+import org.apache.tuscany.core.builder.ObjectFactory;
+import org.apache.tuscany.core.context.AbstractContext;
+import org.apache.tuscany.core.context.ExternalServiceContext;
+import org.apache.tuscany.core.context.QualifiedName;
+import org.apache.tuscany.core.context.TargetException;
+
+/**
+ * An implementation of an external service for system wiring. As system components are not proxied and the system
+ * binding is by-reference, the implementation caches a reference to its configured target.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class SystemExternalServiceContext extends AbstractContext implements ExternalServiceContext {
+
+    // a factory for retrieving the target of the external service wire 
+    private ObjectFactory factory;
+
+    // the cached target
+    private Object cachedInstance;
+
+    // ----------------------------------
+    // Constructors
+    // ----------------------------------
+
+    public SystemExternalServiceContext(String name, ObjectFactory factory) {
+        super(name);
+        assert (factory != null) : "Object factory was null";
+        this.factory = factory;
+    }
+
+    // ----------------------------------
+    // Methods
+    // ----------------------------------
+
+    public Object getInstance(QualifiedName qName) throws TargetException {
+        return getInstance(qName, false);
+    }
+
+    public Object getInstance(QualifiedName qName, boolean notify) throws TargetException {
+        try {
+            if (cachedInstance == null) {
+                cachedInstance = factory.getInstance();
+            }
+            return cachedInstance;
+        } catch (TargetException e) {
+            e.addContextName(getName());
+            throw e;
+        }
+
+    }
+
+    public void start() {
+        lifecycleState = RUNNING;
+    }
+
+    public void stop() {
+        lifecycleState = STOPPED;
+    }
+
+    public Object getImplementationInstance() throws TargetException {
+        return this;
+    }
+
+    public Object getImplementationInstance(boolean notify) throws TargetException {
+        return this;
+    }
+}