diff options
Diffstat (limited to 'sca-java-1.x/tags/java-M1-final/java/sca/containers/container.java/src/main/java/org/apache/tuscany/container/java/invocation/ScopedJavaComponentInvoker.java')
-rw-r--r-- | sca-java-1.x/tags/java-M1-final/java/sca/containers/container.java/src/main/java/org/apache/tuscany/container/java/invocation/ScopedJavaComponentInvoker.java | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/java-M1-final/java/sca/containers/container.java/src/main/java/org/apache/tuscany/container/java/invocation/ScopedJavaComponentInvoker.java b/sca-java-1.x/tags/java-M1-final/java/sca/containers/container.java/src/main/java/org/apache/tuscany/container/java/invocation/ScopedJavaComponentInvoker.java new file mode 100644 index 0000000000..85d72b4b0d --- /dev/null +++ b/sca-java-1.x/tags/java-M1-final/java/sca/containers/container.java/src/main/java/org/apache/tuscany/container/java/invocation/ScopedJavaComponentInvoker.java @@ -0,0 +1,89 @@ +/** + * + * 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.container.java.invocation; + +import org.apache.tuscany.core.context.QualifiedName; +import org.apache.tuscany.core.context.ScopeContext; +import org.apache.tuscany.core.context.TargetException; + +import java.lang.reflect.Method; + +/** + * Uses a scope container to resolve an implementation instance based on the current thread context + * + * @version $Rev$ $Date$ + */ +public class ScopedJavaComponentInvoker extends AbstractJavaComponentInvoker { + + private ScopeContext container; + + private QualifiedName name; + + private Object target; + + public boolean cacheable; + + + /** + * Creates a new invoker + * + * @param serviceName the name of the component/service pair to invoke + * @param operation the operation the invoker is associated with + * @param scopeContext the scope context the component is resolved in + * @param cacheable Sets whether the target service instance may be cached by the invoker. This is a possible optimization + * when a wire is configured for a "down-scope" reference, i.e. a reference from a source of a shorter + * lifetime to a source of greater lifetime. + */ + public ScopedJavaComponentInvoker(QualifiedName serviceName, Method operation, ScopeContext scopeContext, boolean cacheable) { + super(operation); + assert (serviceName != null) : "No service name specified"; + assert (scopeContext != null) : "No scope scopeContext specified"; + name = serviceName; + this.container = scopeContext; + this.cacheable = cacheable; + } + + /** + * Returns whether the target is cacheable. + */ + public boolean isCacheable() { + return cacheable; + } + + /** + * Resolves the target service instance or returns a cached one + */ + protected Object getInstance() throws TargetException { + if (!cacheable) { + return container.getInstance(name); + } else { + if (target == null) { + target = container.getInstance(name); + } + return target; + } + } + + public Object clone() throws CloneNotSupportedException { + ScopedJavaComponentInvoker invoker = (ScopedJavaComponentInvoker) super.clone(); + invoker.target = null; + invoker.cacheable = this.cacheable; + invoker.container = this.container; + invoker.name = this.name; + return invoker; + } +} |