TestGangliaContext.java

/*
 * TestGangliaContext.java
 *
 * 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.metrics.ganglia;

import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import org.apache.hadoop.metrics.ContextFactory;
import org.apache.hadoop.metrics.spi.AbstractMetricsContext;

import java.net.MulticastSocket;

public class TestGangliaContext {
  @Test
  public void testShouldCreateDatagramSocketByDefault() throws Exception {
    GangliaContext context = new GangliaContext();
    context.init("gangliaContext", ContextFactory.getFactory());
    assertFalse("Created MulticastSocket", context.datagramSocket instanceof MulticastSocket);
  }

  @Test
  public void testShouldCreateDatagramSocketIfMulticastIsDisabled() throws Exception {
    GangliaContext context = new GangliaContext();
    ContextFactory factory = ContextFactory.getFactory();
    factory.setAttribute("gangliaContext.multicast", "false");
    context.init("gangliaContext", factory);
    assertFalse("Created MulticastSocket", context.datagramSocket instanceof MulticastSocket);
  }

  @Test
  public void testShouldCreateMulticastSocket() throws Exception {
    GangliaContext context = new GangliaContext();
    ContextFactory factory = ContextFactory.getFactory();
    factory.setAttribute("gangliaContext.multicast", "true");
    context.init("gangliaContext", factory);
    assertTrue("Did not create MulticastSocket", context.datagramSocket instanceof MulticastSocket);
    MulticastSocket multicastSocket = (MulticastSocket) context.datagramSocket;
    assertEquals("Did not set default TTL", multicastSocket.getTimeToLive(), 1);
  }

  @Test
  public void testShouldSetMulticastSocketTtl() throws Exception {
    GangliaContext context = new GangliaContext();
    ContextFactory factory = ContextFactory.getFactory();
    factory.setAttribute("gangliaContext.multicast", "true");
    factory.setAttribute("gangliaContext.multicast.ttl", "10");
    context.init("gangliaContext", factory);
    MulticastSocket multicastSocket = (MulticastSocket) context.datagramSocket;
    assertEquals("Did not set TTL", multicastSocket.getTimeToLive(), 10);
  }
  
  @Test
  public void testCloseShouldCloseTheSocketWhichIsCreatedByInit() throws Exception {
    AbstractMetricsContext context=new GangliaContext();
    context.init("gangliaContext", ContextFactory.getFactory());
    GangliaContext gangliaContext =(GangliaContext) context;
    assertFalse("Socket already closed",gangliaContext.datagramSocket.isClosed());
    context.close();
    assertTrue("Socket not closed",gangliaContext.datagramSocket.isClosed());
  }
}