Github user fhussonnois commented on a diff in the pull request: https://github.com/apache/storm/pull/827#discussion_r45364971 --- Diff: external/storm-cassandra/src/main/java/org/apache/storm/cassandra/executor/AsyncExecutor.java --- @@ -0,0 +1,152 @@ +/** + * 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.storm.cassandra.executor; + +import com.datastax.driver.core.ResultSet; +import com.datastax.driver.core.ResultSetFuture; +import com.datastax.driver.core.Session; +import com.datastax.driver.core.Statement; +import com.google.common.util.concurrent.*; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.Serializable; +import java.util.ArrayList; +import java.util.List; +import java.util.Map; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; + +/** + * Service to asynchronously executes cassandra statements. + */ +public class AsyncExecutor<T> implements Serializable { + + private final static Logger LOG = LoggerFactory.getLogger(AsyncExecutor.class); + + protected Session session; + + protected ExecutorService executorService; + + protected AsyncResultHandler<T> handler; + + private Map<SettableFuture<T>, Boolean> pending = new ConcurrentHashMap<>( ); + + /** + * Creates a new {@link AsyncExecutor} instance. + */ + protected AsyncExecutor(Session session, AsyncResultHandler<T> handler) { + this(session, newSingleThreadExecutor(), handler); + } + + /** + * Creates a new {@link AsyncExecutor} instance. + * + * @param session The cassandra session. + * @param executorService The executor service responsible to execute handler. + */ + private AsyncExecutor(Session session, ExecutorService executorService, AsyncResultHandler<T> handler) { + this.session = session; + this.executorService = executorService; + this.handler = handler; + } + + protected static ExecutorService newSingleThreadExecutor() { + return Executors.newSingleThreadExecutor(new ThreadFactoryBuilder().setNameFormat("cassandra-async-handler-%d").build()); + } + + /** + * Asynchronously executes all statements associated to the specified input. The input will be passed to + * the {@link #handler} once all queries succeed or failed. --- End diff -- Yes there is an issue on the comment. This behavior is implemented with http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/util/concurrent/Futures.html#allAsList(java.lang.Iterable)
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