package org.apache.cassandra.service.paxos; /* * * 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. * */ import java.util.concurrent.CountDownLatch; import java.util.concurrent.TimeUnit; import org.apache.cassandra.config.DatabaseDescriptor; import org.apache.cassandra.db.ConsistencyLevel; import org.apache.cassandra.db.WriteType; import org.apache.cassandra.exceptions.WriteTimeoutException; import org.apache.cassandra.net.IAsyncCallback; public abstract class AbstractPaxosCallback<T> implements IAsyncCallback<T> { protected final CountDownLatch latch; protected final int targets; public AbstractPaxosCallback(int targets) { this.targets = targets; latch = new CountDownLatch(targets); } public boolean isLatencyForSnitch() { return false; } public int getResponseCount() { return (int) (targets - latch.getCount()); } public void await() throws WriteTimeoutException { try { if (!latch.await(DatabaseDescriptor.getWriteRpcTimeout(), TimeUnit.MILLISECONDS)) throw new WriteTimeoutException(WriteType.CAS, ConsistencyLevel.SERIAL, getResponseCount(), targets); } catch (InterruptedException ex) { throw new AssertionError("This latch shouldn't have been interrupted."); } } }