/**
* 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.hadoop.yarn.service;
import org.apache.hadoop.conf.Configuration;
import org.junit.Test;
public class TestServiceLifecycle extends ServiceAssert {
void assertStateCount(BreakableService service,
Service.STATE state,
int expected) {
int actual = service.getCount(state);
if (expected != actual) {
fail("Expected entry count for state [" + state +"] of " + service
+ " to be " + expected + " but was " + actual);
}
}
@Test
public void testWalkthrough() throws Throwable {
BreakableService svc = new BreakableService();
assertServiceStateCreated(svc);
assertStateCount(svc, Service.STATE.NOTINITED, 1);
assertStateCount(svc, Service.STATE.INITED, 0);
assertStateCount(svc, Service.STATE.STARTED, 0);
assertStateCount(svc, Service.STATE.STOPPED, 0);
svc.init(new Configuration());
assertServiceStateInited(svc);
assertStateCount(svc, Service.STATE.INITED, 1);
svc.start();
assertServiceStateStarted(svc);
assertStateCount(svc, Service.STATE.STARTED, 1);
svc.stop();
assertServiceStateStopped(svc);
assertStateCount(svc, Service.STATE.STOPPED, 1);
}
/**
* call init twice
* @throws Throwable
*/
@Test
public void testInitTwice() throws Throwable {
BreakableService svc = new BreakableService();
svc.init(new Configuration());
try {
svc.init(new Configuration());
fail("Expected a failure, got " + svc);
} catch (IllegalStateException e) {
//expected
}
assertStateCount(svc, Service.STATE.INITED, 2);
}
/**
* call start twice
* @throws Throwable
*/
@Test
public void testStartTwice() throws Throwable {
BreakableService svc = new BreakableService();
svc.init(new Configuration());
svc.start();
try {
svc.start();
fail("Expected a failure, got " + svc);
} catch (IllegalStateException e) {
//expected
}
assertStateCount(svc, Service.STATE.STARTED, 2);
}
/**
* verify that when a service is stopped more than once, no exception
* is thrown, and the counter is incremented
* this is because the state change operations happen after the counter in
* the subclass is incremented, even though stop is meant to be a no-op
* @throws Throwable
*/
@Test
public void testStopTwice() throws Throwable {
BreakableService svc = new BreakableService();
svc.init(new Configuration());
svc.start();
svc.stop();
assertStateCount(svc, Service.STATE.STOPPED, 1);
svc.stop();
assertStateCount(svc, Service.STATE.STOPPED, 2);
}
/**
* Show that if the service failed during an init
* operation, it stays in the created state, even after stopping it
* @throws Throwable
*/
@Test
public void testStopFailedInit() throws Throwable {
BreakableService svc = new BreakableService(true, false, false);
assertServiceStateCreated(svc);
try {
svc.init(new Configuration());
fail("Expected a failure, got " + svc);
} catch (BreakableService.BrokenLifecycleEvent e) {
//expected
}
//the service state wasn't passed
assertServiceStateCreated(svc);
assertStateCount(svc, Service.STATE.INITED, 1);
//now try to stop
svc.stop();
//even after the stop operation, we haven't entered the state
assertServiceStateCreated(svc);
}
/**
* Show that if the service failed during an init
* operation, it stays in the created state, even after stopping it
* @throws Throwable
*/
@Test
public void testStopFailedStart() throws Throwable {
BreakableService svc = new BreakableService(false, true, false);
svc.init(new Configuration());
assertServiceStateInited(svc);
try {
svc.start();
fail("Expected a failure, got " + svc);
} catch (BreakableService.BrokenLifecycleEvent e) {
//expected
}
//the service state wasn't passed
assertServiceStateInited(svc);
assertStateCount(svc, Service.STATE.INITED, 1);
//now try to stop
svc.stop();
//even after the stop operation, we haven't entered the state
assertServiceStateInited(svc);
}
/**
* verify that when a service is stopped more than once, no exception
* is thrown, and the counter is incremented
* this is because the state change operations happen after the counter in
* the subclass is incremented, even though stop is meant to be a no-op
* @throws Throwable
*/
@Test
public void testFailingStop() throws Throwable {
BreakableService svc = new BreakableService(false, false, true);
svc.init(new Configuration());
svc.start();
try {
svc.stop();
fail("Expected a failure, got " + svc);
} catch (BreakableService.BrokenLifecycleEvent e) {
//expected
}
assertStateCount(svc, Service.STATE.STOPPED, 1);
//now try again, and expect it to happen again
try {
svc.stop();
fail("Expected a failure, got " + svc);
} catch (BreakableService.BrokenLifecycleEvent e) {
//expected
}
assertStateCount(svc, Service.STATE.STOPPED, 2);
}
}