// Copyright 2005 The Apache Software Foundation
//
// 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.tapestry.services.impl;
import java.io.IOException;
import org.apache.hivemind.util.Defense;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.engine.IEngineService;
import org.apache.tapestry.engine.ILink;
/**
* Inner proxy that actually resolves the engine service using the
* {@link org.apache.tapestry.services.impl.EngineServiceSource}, then replaces itself in the outer
* proxy.
*
* @author Howard M. Lewis Ship
* @since 4.0
* @see org.apache.tapestry.services.impl.EngineServiceOuterProxy
*/
public class EngineServiceInnerProxy implements IEngineService
{
private final String _serviceName;
private final EngineServiceOuterProxy _outerProxy;
private final EngineServiceSource _source;
public EngineServiceInnerProxy(String serviceName, EngineServiceOuterProxy outerProxy,
EngineServiceSource source)
{
Defense.notNull(serviceName, "serviceName");
Defense.notNull(outerProxy, "outerProxy");
Defense.notNull(source, "source");
_serviceName = serviceName;
_outerProxy = outerProxy;
_source = source;
}
public String toString()
{
return ImplMessages.engineServiceInnerProxyToString(_serviceName);
}
private IEngineService resolve()
{
IEngineService service = _source.resolveEngineService(_serviceName);
_outerProxy.installDelegate(service);
return service;
}
public synchronized ILink getLink(IRequestCycle cycle, Object parameter)
{
return resolve().getLink(cycle, parameter);
}
public synchronized void service(IRequestCycle cycle) throws IOException
{
resolve().service(cycle);
}
public String getName()
{
return _serviceName;
}
}