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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;
import org.apache.qpid.AMQException;
import org.apache.qpid.framing.AMQMethodBody;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Represents a method sent to a group of Member instances. Manages the responses,
* completion and callback.
*
*/
class GroupRequest
{
private final Map<Member, AMQMethodBody> _responses = new HashMap<Member, AMQMethodBody>();
private final List<Member> _brokers = new ArrayList<Member>();
private boolean _sent;
private final Sendable _request;
private final BroadcastPolicy _policy;
private final GroupResponseHandler _callback;
GroupRequest(Sendable request, BroadcastPolicy policy, GroupResponseHandler callback)
{
_request = request;
_policy = policy;
_callback = callback;
}
void send(int channel, Member session) throws AMQException
{
_brokers.add(session);
_request.send(channel, session);
}
boolean finishedSend()
{
_sent = true;
return checkCompletion();
}
public boolean responseReceived(Member broker, AMQMethodBody response)
{
_responses.put(broker, response);
return checkCompletion();
}
public boolean removed(Member broker)
{
_brokers.remove(broker);
return checkCompletion();
}
private synchronized boolean checkCompletion()
{
return isComplete() && callback();
}
boolean isComplete()
{
return _sent && _policy != null && _policy.isComplete(_responses.size(), _brokers.size());
}
boolean callback()
{
_callback.response(getResults(), _brokers);
return true;
}
List<AMQMethodBody> getResults()
{
List<AMQMethodBody> results = new ArrayList<AMQMethodBody>(_brokers.size());
for (Member b : _brokers)
{
results.add(_responses.get(b));
}
return results;
}
public String toString()
{
return "GroupRequest{request=" + _request +", brokers=" + _brokers + ", responses=" + _responses + "}";
}
}
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