/*
* 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.giraph.comm.netty.handler;
import org.apache.giraph.comm.netty.NettyServer;
import org.apache.giraph.conf.GiraphConstants;
import org.apache.giraph.utils.IncreasingBitSet;
import org.apache.hadoop.conf.Configuration;
import com.google.common.collect.MapMaker;
import java.util.concurrent.ConcurrentMap;
/**
* Provides a thread-safe map for checking worker and request id pairs
*/
public class WorkerRequestReservedMap {
/** Map of the worker ids to the requests received (bit set) */
private final ConcurrentMap<Integer, IncreasingBitSet>
workerRequestReservedMap;
/**
* Constructor
*
* @param conf Configuration
*/
public WorkerRequestReservedMap(Configuration conf) {
workerRequestReservedMap = new MapMaker().concurrencyLevel(
conf.getInt(GiraphConstants.MSG_NUM_FLUSH_THREADS,
NettyServer.MAXIMUM_THREAD_POOL_SIZE_DEFAULT)).makeMap();
}
/**
* Reserve the request (before the request starts to insure that it is
* only executed once). We are assuming no failure on the server.
*
* @param workerId workerId of the request
* @param requestId Request id
* @return True if the reserving succeeded, false otherwise
*/
public boolean reserveRequest(Integer workerId, long requestId) {
IncreasingBitSet requestSet = getRequestSet(workerId);
return requestSet.add(requestId);
}
/**
* Get and create the entry as necessary to get the request bit set.
*
* @param workerId Id of the worker to get the bit set for
* @return Bit set for the worker
*/
private IncreasingBitSet getRequestSet(Integer workerId) {
IncreasingBitSet requestSet = workerRequestReservedMap.get(workerId);
if (requestSet == null) {
requestSet = new IncreasingBitSet();
IncreasingBitSet previous =
workerRequestReservedMap.putIfAbsent(workerId, requestSet);
if (previous != null) {
requestSet = previous;
}
}
return requestSet;
}
}