/**
* 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.stratos.load.balancer.test;
import org.apache.stratos.load.balancer.statistics.InFlightRequestIncrementCallable;
import org.apache.stratos.load.balancer.statistics.LoadBalancerStatisticsCollector;
import org.junit.Assert;
import org.apache.stratos.load.balancer.statistics.InFlightRequestDecrementCallable;
import org.apache.stratos.load.balancer.statistics.LoadBalancerStatisticsExecutor;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import java.util.concurrent.Future;
import java.util.concurrent.FutureTask;
/**
* Load balancer statistics collector tests.
*/
@RunWith(JUnit4.class)
public class LoadBalancerStatisticsCollectorTest {
/***
* Test in-flight request count calculation.
*/
@Test
public void testInFlightRequestCountCalculation() {
String clusterId = "cluster1";
String incrementErrorMessage = "Could not increment in-flight request count: ";
String decrementErrorMessage = "Could not decrement in-flight request count: ";
FutureTask<Object> task = new FutureTask<Object>(new InFlightRequestIncrementCallable(clusterId));
executeTask(task);
Assert.assertEquals(incrementErrorMessage, 1, LoadBalancerStatisticsCollector.getInstance().getInFlightRequestCount(clusterId));
task = new FutureTask<Object>(new InFlightRequestIncrementCallable(clusterId));
executeTask(task);
Assert.assertEquals(incrementErrorMessage, 2, LoadBalancerStatisticsCollector.getInstance().getInFlightRequestCount(clusterId));
task = new FutureTask<Object>(new InFlightRequestIncrementCallable(clusterId));
executeTask(task);
Assert.assertEquals(incrementErrorMessage, 3, LoadBalancerStatisticsCollector.getInstance().getInFlightRequestCount(clusterId));
task = new FutureTask<Object>(new InFlightRequestDecrementCallable(clusterId));
executeTask(task);
Assert.assertEquals(decrementErrorMessage, 2, LoadBalancerStatisticsCollector.getInstance().getInFlightRequestCount(clusterId));
task = new FutureTask<Object>(new InFlightRequestDecrementCallable(clusterId));
executeTask(task);
Assert.assertEquals(decrementErrorMessage, 1, LoadBalancerStatisticsCollector.getInstance().getInFlightRequestCount(clusterId));
task = new FutureTask<Object>(new InFlightRequestDecrementCallable(clusterId));
executeTask(task);
Assert.assertEquals(decrementErrorMessage, 0, LoadBalancerStatisticsCollector.getInstance().getInFlightRequestCount(clusterId));
LoadBalancerStatisticsCollector.clear();
}
private void executeTask(FutureTask<Object> task) {
Future future = LoadBalancerStatisticsExecutor.getInstance().getService().submit(task);
while(!future.isDone()) {
// Wait until task get executed
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// Might not need to trace
}
}
}
}