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)
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
