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/*
*
* Copyright (c) 2006 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.qpid.server.cluster;
import java.util.HashMap;
import java.util.Map;
import java.util.PriorityQueue;
/**
* Maintains loading information about the local member and its cluster peers.
*
*/
public class LoadTable
{
private final Map<MemberHandle, Loading> _peers = new HashMap<MemberHandle, Loading>();
private final PriorityQueue<Loading> _loads = new PriorityQueue<Loading>();
private final Loading _local = new Loading(null);
public LoadTable()
{
_loads.add(_local);
}
public void setLoad(Member member, long load)
{
synchronized (_peers)
{
Loading loading = _peers.get(member);
if (loading == null)
{
loading = new Loading(member);
synchronized (_loads)
{
_loads.add(loading);
}
_peers.put(member, loading);
}
loading.load = load;
}
}
public void incrementLocalLoad()
{
synchronized (_local)
{
_local.load++;
}
}
public void decrementLocalLoad()
{
synchronized (_local)
{
_local.load--;
}
}
public long getLocalLoad()
{
synchronized (_local)
{
return _local.load;
}
}
public Member redirect()
{
synchronized (_loads)
{
return _loads.peek().member;
}
}
private static class Loading implements Comparable
{
private final Member member;
private long load;
Loading(Member member)
{
this.member = member;
}
public int compareTo(Object o)
{
return (int) (load - ((Loading) o).load);
}
}
}
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