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/*
* 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.extension.helper.impl;
import java.util.ArrayList;
import java.util.List;
import org.apache.tuscany.sca.assembly.Implementation;
import org.apache.tuscany.sca.extension.helper.ImplementationActivator;
import org.apache.tuscany.sca.extension.helper.InvokerFactory;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.provider.ImplementationProvider;
import org.apache.tuscany.sca.runtime.RuntimeComponent;
import org.apache.tuscany.sca.runtime.RuntimeComponentService;
/**
* The ImplementationProvider createInvoker method is called before the start method
* but the runtime isn't properly setup until the start method is called. This means
* that Invoker's can't initialize things like the services, references and properties
* until start is called. This class tries to get around that by using an Invoker
* proxy that delays creating the real Invoker till start is called.
*
* @version $Rev$ $Date$
*/
public class ImplementationImplementationProvider implements ImplementationProvider {
ImplementationActivator implementationActivator;
RuntimeComponent runtimeComponent;
Implementation impl;
Object userImpl;
InvokerFactory factory;
List<InvokerProxy> invokers = new ArrayList<InvokerProxy>();
public ImplementationImplementationProvider(ImplementationActivator implementationActivator,
RuntimeComponent rc,
Implementation impl,
Object userImpl) {
this.implementationActivator = implementationActivator;
this.runtimeComponent = rc;
this.impl = impl;
this.userImpl = userImpl;
}
public Invoker createInvoker(RuntimeComponentService arg0, final Operation op) {
InvokerProxy invoker = new InvokerProxy(op);
return invoker;
}
public boolean supportsOneWayInvocation() {
return false;
}
public void start() {
factory = implementationActivator.createInvokerFactory(runtimeComponent, impl, userImpl);
}
public void stop() {
}
class InvokerProxy implements Invoker {
Invoker invoker;
Operation op;
InvokerProxy(Operation op) {
this.op = op;
}
public Message invoke(Message msg) {
init();
return invoker.invoke(msg);
}
public synchronized void init() {
if (invoker == null) {
invoker = factory.createInvoker(op);
}
}
}
}
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