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(issue #29) producer cluster example
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nfsdb-examples/src/main/java/org/nfsdb/examples/network/cluster/ClusteredProducerMain.java
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| /* | ||
| * Copyright (c) 2014. Vlad Ilyushchenko | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
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| package org.nfsdb.examples.network.cluster; | ||
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| import com.nfsdb.JournalWriter; | ||
| import com.nfsdb.exceptions.JournalException; | ||
| import com.nfsdb.factory.JournalFactory; | ||
| import com.nfsdb.factory.configuration.JournalConfigurationBuilder; | ||
| import com.nfsdb.net.cluster.ClusterController; | ||
| import com.nfsdb.net.cluster.ClusterNode; | ||
| import com.nfsdb.net.cluster.ClusterStatusListener; | ||
| import com.nfsdb.utils.Numbers; | ||
| import org.nfsdb.examples.model.Price; | ||
|
|
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| import java.util.ArrayList; | ||
| import java.util.concurrent.CountDownLatch; | ||
| import java.util.concurrent.TimeUnit; | ||
|
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| public class ClusteredProducerMain { | ||
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| public static void main(String[] args) throws JournalException { | ||
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| final String pathToDatabase = args[0]; | ||
| final int instance = Numbers.parseInt(args[1]); | ||
| final JournalFactory factory = new JournalFactory(new JournalConfigurationBuilder() {{ | ||
| $(Price.class).$ts(); | ||
| }}.build(pathToDatabase)); | ||
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| final JournalWriter<Price> writer = factory.writer(Price.class); | ||
| final WorkerController wc = new WorkerController(writer); | ||
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| final ClusterController cc = new ClusterController( | ||
| new ArrayList<ClusterNode>() {{ | ||
| add(new ClusterNode(1, "localhost:7080")); | ||
| add(new ClusterNode(2, "localhost:7090")); | ||
| }} | ||
| , instance | ||
| , wc | ||
| , factory | ||
| , | ||
| new ArrayList<JournalWriter>() {{ | ||
| add(writer); | ||
| }} | ||
| ); | ||
|
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| cc.start(); | ||
| } | ||
|
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| /** | ||
| * Controller listens to cluster state and performs fail over of work. | ||
| * In this case by starting worker thread when node is activated. | ||
| */ | ||
| public static class WorkerController implements ClusterStatusListener { | ||
|
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| private final JournalWriter<Price> writer; | ||
| private Worker worker; | ||
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| public WorkerController(JournalWriter<Price> writer) { | ||
| this.writer = writer; | ||
| } | ||
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| @Override | ||
| public void onNodeActive() { | ||
| System.out.println("This node is active"); | ||
| (worker = new Worker(writer)).start(); | ||
| } | ||
|
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| private void stopWorker() { | ||
| if (worker != null) { | ||
| worker.halt(); | ||
| worker = null; | ||
| } | ||
| } | ||
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| @Override | ||
| public void onNodeStandingBy(ClusterNode activeNode) { | ||
| System.out.println("This node is standing by"); | ||
| stopWorker(); | ||
| } | ||
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| @Override | ||
| public void onShutdown() { | ||
| stopWorker(); | ||
| writer.close(); | ||
| } | ||
| } | ||
|
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| public static class Worker { | ||
| private final JournalWriter<Price> writer; | ||
| private final Price p = new Price(); | ||
| private final CountDownLatch breakLatch = new CountDownLatch(1); | ||
| private final CountDownLatch haltLatch = new CountDownLatch(1); | ||
|
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| public Worker(JournalWriter<Price> writer) { | ||
| this.writer = writer; | ||
| } | ||
|
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| public void start() { | ||
| new Thread() { | ||
| @Override | ||
| public void run() { | ||
| try { | ||
| long t = writer.getMaxTimestamp(); | ||
| if (t == 0) { | ||
| System.currentTimeMillis(); | ||
| } | ||
|
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| while (true) { | ||
| for (int i = 0; i < 50000; i++) { | ||
| p.setTimestamp(t += i); | ||
| p.setNanos(System.nanoTime()); | ||
| p.setSym(String.valueOf(i % 20)); | ||
| p.setPrice(i * 1.04598 + i); | ||
| writer.append(p); | ||
| } | ||
| writer.commit(); | ||
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| breakLatch.await(2, TimeUnit.SECONDS); | ||
| if (breakLatch.getCount() == 0) { | ||
| break; | ||
| } | ||
|
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| } | ||
| } catch (Exception e) { | ||
| e.printStackTrace(); | ||
| } finally { | ||
| haltLatch.countDown(); | ||
| } | ||
| } | ||
| }.start(); | ||
| } | ||
|
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| public void halt() { | ||
| try { | ||
| breakLatch.countDown(); | ||
| haltLatch.await(); | ||
| } catch (InterruptedException ignore) { | ||
| } | ||
| } | ||
| } | ||
| } |