org.apache.hama.monitor.TestFederator.java Source code

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Here is the source code for org.apache.hama.monitor.TestFederator.java

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/**
 * 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.hama.monitor;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.atomic.AtomicInteger;

import junit.framework.TestCase;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hama.HamaConfiguration;
import org.apache.hama.monitor.Federator.Act;
import org.apache.hama.monitor.Federator.Collector;
import org.apache.hama.monitor.Federator.CollectorHandler;

public class TestFederator extends TestCase {

    public static final Log LOG = LogFactory.getLog(TestFederator.class);

    Federator federator;

    final static int expected = 10;

    public static final class DummyCollector implements Collector {

        final AtomicInteger sum = new AtomicInteger(0);

        public DummyCollector(int value) {
            sum.set(value);
        }

        @Override
        public Object harvest() throws Exception {
            assertEquals("Test if value is equal before harvest.", expected, sum.get());
            int result = sum.incrementAndGet();
            Thread.sleep(2 * 1000); // simulate task execution which takes time.
            assertEquals("Test if value is equal after harvest.", (expected + 1), result);
            return result;
        }

    }

    @Override
    public void setUp() throws Exception {
        this.federator = new Federator(new HamaConfiguration());
        this.federator.start();
    }

    public void testExecutionFlow() throws Exception {
        LOG.info("Value before submitted: " + expected);
        final AtomicInteger finalResult = new AtomicInteger(0);
        final Act act = new Act(new DummyCollector(expected), new CollectorHandler() {
            @Override
            public void handle(@SuppressWarnings("rawtypes") Future future) {
                try {
                    finalResult.set(((Integer) future.get()).intValue());
                    LOG.info("Value after submitted: " + finalResult);
                } catch (ExecutionException ee) {
                    LOG.error(ee);
                } catch (InterruptedException ie) {
                    LOG.error(ie);
                    Thread.currentThread().interrupt();
                }
            }
        });
        this.federator.register(act);
        Thread.sleep(3 * 1000);
        assertEquals("Result should be " + (expected + 1) + ".", finalResult.get(), (expected + 1));
    }

    @Override
    public void tearDown() throws Exception {
        this.federator.interrupt();
    }

}