/**
* 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.ambari.server.state.services;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;
import javax.persistence.EntityManager;
import org.apache.ambari.server.configuration.Configuration;
import org.apache.ambari.server.controller.jmx.JMXMetricHolder;
import org.apache.ambari.server.controller.utilities.StreamProvider;
import org.apache.ambari.server.orm.DBAccessor;
import org.apache.ambari.server.state.Cluster;
import org.apache.ambari.server.state.Clusters;
import org.apache.ambari.server.state.services.MetricsRetrievalService.MetricSourceType;
import org.apache.ambari.server.state.stack.OsFamily;
import org.apache.ambari.server.utils.SynchronousThreadPoolExecutor;
import org.apache.commons.io.IOUtils;
import org.easymock.EasyMock;
import org.easymock.EasyMockSupport;
import org.junit.Before;
import org.junit.Test;
import com.google.inject.Binder;
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Module;
import junit.framework.Assert;
/**
* Tests the {@link MetricsRetrievalService}.
*/
public class MetricsRetrievalServiceTest extends EasyMockSupport {
private Injector m_injector;
private static final String JMX_URL = "http://jmx-endpoint";
private static final String REST_URL = "http://rest-endpoint";
MetricsRetrievalService m_service = new MetricsRetrievalService();
/**
*
*/
@Before
public void before() {
// create an injector which will inject the mocks
m_injector = Guice.createInjector(new MockModule());
m_injector.injectMembers(m_service);
}
/**
* Tests that initial missing values are returned correctly as {@code null}.
*/
@Test
public void testCachedValueRetrievalDoesNotRequest() throws Exception {
m_service.doStart();
JMXMetricHolder jmxMetricHolder = m_service.getCachedJMXMetric(JMX_URL);
Assert.assertNull(jmxMetricHolder);
Map<String, String> restMetrics = m_service.getCachedRESTMetric(REST_URL);
Assert.assertNull(restMetrics);
}
/**
* Tests retrieval of metrics.
*/
@Test
public void testRetrievalOfMetrics() throws Exception {
InputStream jmxInputStream = IOUtils.toInputStream("{ \"beans\": [] }");
InputStream restInputStream = IOUtils.toInputStream("{}");
StreamProvider streamProvider = createNiceMock(StreamProvider.class);
EasyMock.expect(streamProvider.readFrom(JMX_URL)).andReturn(jmxInputStream).once();
EasyMock.expect(streamProvider.readFrom(REST_URL)).andReturn(restInputStream).once();
replayAll();
m_service.doStart();
// make the service synchronous
m_service.setThreadPoolExecutor(new SynchronousThreadPoolExecutor());
JMXMetricHolder jmxMetricHolder = m_service.getCachedJMXMetric(JMX_URL);
Assert.assertNull(jmxMetricHolder);
Map<String, String> restMetrics = m_service.getCachedRESTMetric(REST_URL);
Assert.assertNull(restMetrics);
m_service.submitRequest(MetricSourceType.JMX, streamProvider, JMX_URL);
jmxMetricHolder = m_service.getCachedJMXMetric(JMX_URL);
Assert.assertNotNull(jmxMetricHolder);
m_service.submitRequest(MetricSourceType.REST, streamProvider, REST_URL);
restMetrics = m_service.getCachedRESTMetric(REST_URL);
Assert.assertNotNull(restMetrics);
verifyAll();
}
/**
* Test removing cached values if request failed with IOException.
*/
@Test
public void testRemovingValuesFromCacheOnFail() throws Exception {
Configuration configuration = m_injector.getInstance(Configuration.class);
configuration.setProperty(
Configuration.METRIC_RETRIEVAL_SERVICE_REQUEST_TTL.getKey(), "1");
InputStream jmxInputStream = IOUtils.toInputStream("{ \"beans\": [] }");
InputStream restInputStream = IOUtils.toInputStream("{}");
StreamProvider streamProvider = createNiceMock(StreamProvider.class);
EasyMock.expect(streamProvider.readFrom(JMX_URL)).andReturn(jmxInputStream).once();
EasyMock.expect(streamProvider.readFrom(REST_URL)).andReturn(restInputStream).once();
EasyMock.expect(streamProvider.readFrom(JMX_URL)).andThrow(new IOException()).once();
EasyMock.expect(streamProvider.readFrom(REST_URL)).andThrow(new IOException()).once();
replayAll();
m_service.doStart();
// make the service synchronous
m_service.setThreadPoolExecutor(new SynchronousThreadPoolExecutor());
JMXMetricHolder jmxMetricHolder = m_service.getCachedJMXMetric(JMX_URL);
Assert.assertNull(jmxMetricHolder);
Map<String, String> restMetrics = m_service.getCachedRESTMetric(REST_URL);
Assert.assertNull(restMetrics);
m_service.submitRequest(MetricSourceType.JMX, streamProvider, JMX_URL);
jmxMetricHolder = m_service.getCachedJMXMetric(JMX_URL);
Assert.assertNotNull(jmxMetricHolder);
m_service.submitRequest(MetricSourceType.REST, streamProvider, REST_URL);
restMetrics = m_service.getCachedRESTMetric(REST_URL);
Assert.assertNotNull(restMetrics);
jmxMetricHolder = m_service.getCachedJMXMetric(JMX_URL);
Assert.assertNotNull(jmxMetricHolder);
restMetrics = m_service.getCachedRESTMetric(REST_URL);
Assert.assertNotNull(restMetrics);
Thread.sleep(1000);
m_service.submitRequest(MetricSourceType.JMX, streamProvider, JMX_URL);
jmxMetricHolder = m_service.getCachedJMXMetric(JMX_URL);
Assert.assertNull(jmxMetricHolder);
m_service.submitRequest(MetricSourceType.REST, streamProvider, REST_URL);
restMetrics = m_service.getCachedRESTMetric(REST_URL);
Assert.assertNull(restMetrics);
verifyAll();
}
/**
* Tests that many requests to the same URL do not invoke the stream provider
* more than once.
*/
@Test
public void testRequestTTL() throws Exception {
InputStream jmxInputStream = IOUtils.toInputStream("{ \"beans\": [] }");
// only allow a single call to the mock
StreamProvider streamProvider = createStrictMock(StreamProvider.class);
EasyMock.expect(streamProvider.readFrom(JMX_URL)).andReturn(jmxInputStream).once();
replayAll();
m_service.doStart();
// make the service synchronous
m_service.setThreadPoolExecutor(new SynchronousThreadPoolExecutor());
// make 100 requests in rapid succession to the same URL
for (int i = 0; i < 100; i++) {
m_service.submitRequest(MetricSourceType.JMX, streamProvider, JMX_URL);
}
verifyAll();
}
/**
* Tests that disabling the request TTL allows subsequent requests for the
* same resource.
*/
@Test
public void testRequestTTLDisabled() throws Exception {
Configuration configuration = m_injector.getInstance(Configuration.class);
configuration.setProperty(
Configuration.METRIC_RETRIEVAL_SERVICE_REQUEST_TTL_ENABLED.getKey(), "false");
InputStream jmxInputStream = IOUtils.toInputStream("{ \"beans\": [] }");
// allow 100 calls to the mock exactly
StreamProvider streamProvider = createStrictMock(StreamProvider.class);
EasyMock.expect(streamProvider.readFrom(JMX_URL)).andReturn(jmxInputStream).times(100);
replayAll();
m_service.doStart();
// make the service synchronous
m_service.setThreadPoolExecutor(new SynchronousThreadPoolExecutor());
// make 100 requests in rapid succession to the same URL
for (int i = 0; i < 100; i++) {
m_service.submitRequest(MetricSourceType.JMX, streamProvider, JMX_URL);
}
verifyAll();
}
/**
*
*/
private class MockModule implements Module {
/**
* {@inheritDoc}
*/
@Override
public void configure(Binder binder) {
Cluster cluster = EasyMock.createNiceMock(Cluster.class);
binder.bind(Clusters.class).toInstance(createNiceMock(Clusters.class));
binder.bind(OsFamily.class).toInstance(createNiceMock(OsFamily.class));
binder.bind(DBAccessor.class).toInstance(createNiceMock(DBAccessor.class));
binder.bind(Cluster.class).toInstance(cluster);
binder.bind(EntityManager.class).toInstance(createNiceMock(EntityManager.class));
}
}
}