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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.qpid.server.cluster.handler;
import org.apache.qpid.framing.AMQMethodBody;
import org.apache.qpid.server.cluster.MethodHandlerFactory;
import org.apache.qpid.server.cluster.MethodHandlerRegistry;
import org.apache.qpid.server.state.AMQState;
import org.apache.qpid.server.state.StateAwareMethodListener;
public abstract class WrappingMethodHandlerFactory implements MethodHandlerFactory
{
private final MethodHandlerFactory _delegate;
private final StateAwareMethodListener _pre;
private final StateAwareMethodListener _post;
protected WrappingMethodHandlerFactory(MethodHandlerFactory delegate,
StateAwareMethodListener pre,
StateAwareMethodListener post)
{
_delegate = delegate;
_pre = pre;
_post = post;
}
public MethodHandlerRegistry register(AMQState state, MethodHandlerRegistry registry)
{
if (isWrappableState(state))
{
return wrap(_delegate.register(state, registry), state);
}
else
{
return _delegate.register(state, registry);
}
}
protected abstract boolean isWrappableState(AMQState state);
protected abstract Iterable<FrameDescriptor> getWrappableFrameTypes(AMQState state);
private MethodHandlerRegistry wrap(MethodHandlerRegistry registry, AMQState state)
{
for (FrameDescriptor fd : getWrappableFrameTypes(state))
{
wrap(registry, fd.type, fd.instance);
}
return registry;
}
private <A extends AMQMethodBody, B extends Class<A>> void wrap(MethodHandlerRegistry r, B type, A frame)
{
r.addHandler(type, new WrappedListener<A>(r.getHandler(frame), _pre, _post));
}
protected static class FrameDescriptor<A extends AMQMethodBody, B extends Class<A>>
{
protected final A instance;
protected final B type;
public FrameDescriptor(B type, A instance)
{
this.instance = instance;
this.type = type;
}
}
}
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