diff options
Diffstat (limited to 'sca-java-1.x/tags/java-M1-final/java/sca/core/src/main/java/org/apache/tuscany/core/system/context/SystemExternalServiceContext.java')
-rw-r--r-- | sca-java-1.x/tags/java-M1-final/java/sca/core/src/main/java/org/apache/tuscany/core/system/context/SystemExternalServiceContext.java | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/java-M1-final/java/sca/core/src/main/java/org/apache/tuscany/core/system/context/SystemExternalServiceContext.java b/sca-java-1.x/tags/java-M1-final/java/sca/core/src/main/java/org/apache/tuscany/core/system/context/SystemExternalServiceContext.java new file mode 100644 index 0000000000..b85bd2722b --- /dev/null +++ b/sca-java-1.x/tags/java-M1-final/java/sca/core/src/main/java/org/apache/tuscany/core/system/context/SystemExternalServiceContext.java @@ -0,0 +1,67 @@ +/** + * + * 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.impl.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; + + public SystemExternalServiceContext(String name, ObjectFactory factory) { + super(name); + assert (factory != null) : "Object factory was null"; + this.factory = factory; + } + + public Object getInstance(QualifiedName qName) 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 getHandler() throws TargetException { + return this; + } + +} |