NodeProxyManagerTest.java

/**
 * Copyright 2011 the original author or authors.
 *
 * Licensed 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 net.sf.katta.client;

import java.lang.reflect.InvocationTargetException;
import java.net.ConnectException;

import net.sf.katta.AbstractTest;
import net.sf.katta.lib.lucene.ILuceneServer;
import net.sf.katta.node.IContentServer;

import org.apache.hadoop.conf.Configuration;
import org.junit.Test;

import static org.mockito.Mockito.doReturn;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.spy;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.verifyNoMoreInteractions;

import static org.mockito.Matchers.anyString;

import static org.fest.assertions.Assertions.assertThat;

public class NodeProxyManagerTest extends AbstractTest {

  private INodeSelectionPolicy _nodeSelectionPolicy = mock(INodeSelectionPolicy.class);
  private NodeProxyManager _proxyManager = new NodeProxyManager(ILuceneServer.class, new Configuration(),
          _nodeSelectionPolicy);

  @Test
  public void testProxyFailure() throws Exception {
    NodeProxyManager proxyManagerSpy = spy(_proxyManager);
    IContentServer contentServer = mock(IContentServer.class);
    doReturn(contentServer).when(proxyManagerSpy).createNodeProxy(anyString());

    assertThat(proxyManagerSpy.getProxy("node1", true)).isNotNull();
    assertThat(proxyManagerSpy.getProxy("node2", true)).isNotNull();
    proxyManagerSpy.setSuccessiveProxyFailuresBeforeReestablishing(2);

    // node1 failure
    reportNodeFailure(proxyManagerSpy, "node1");
    verifyNoMoreInteractions(_nodeSelectionPolicy);
    assertThat(proxyManagerSpy.getProxy("node1", false)).isNotNull();
    assertThat(proxyManagerSpy.getProxy("node2", false)).isNotNull();

    // node2 failure
    reportNodeFailure(proxyManagerSpy, "node2");
    verifyNoMoreInteractions(_nodeSelectionPolicy);
    assertThat(proxyManagerSpy.getProxy("node1", false)).isNotNull();
    assertThat(proxyManagerSpy.getProxy("node2", false)).isNotNull();

    // node1 success
    proxyManagerSpy.reportNodeCommunicationSuccess("node1");

    // node1 failure
    reportNodeFailure(proxyManagerSpy, "node1");
    verifyNoMoreInteractions(_nodeSelectionPolicy);
    assertThat(proxyManagerSpy.getProxy("node1", false)).isNotNull();
    assertThat(proxyManagerSpy.getProxy("node2", false)).isNotNull();

    // node2 failure
    reportNodeFailure(proxyManagerSpy, "node2");
    verify(_nodeSelectionPolicy).removeNode("node2");
    verifyNoMoreInteractions(_nodeSelectionPolicy);
    assertThat(proxyManagerSpy.getProxy("node1", false)).isNotNull();
    assertThat(proxyManagerSpy.getProxy("node2", false)).isNull();
  }

  @Test
  public void testProxyFailure_ConnectionFailure() throws Exception {
    NodeProxyManager proxyManagerSpy = spy(_proxyManager);
    IContentServer contentServer = mock(IContentServer.class);
    doReturn(contentServer).when(proxyManagerSpy).createNodeProxy(anyString());

    assertThat(proxyManagerSpy.getProxy("node1", true)).isNotNull();
    assertThat(proxyManagerSpy.getProxy("node2", true)).isNotNull();
    proxyManagerSpy.setSuccessiveProxyFailuresBeforeReestablishing(2);

    // node1 connect failure
    reportNodeFailure(proxyManagerSpy, "node1", new InvocationTargetException(new ConnectException()));
    verify(_nodeSelectionPolicy).removeNode("node1");
    verifyNoMoreInteractions(_nodeSelectionPolicy);
    assertThat(proxyManagerSpy.getProxy("node1", false)).isNull();
    assertThat(proxyManagerSpy.getProxy("node2", false)).isNotNull();
  }

  private void reportNodeFailure(NodeProxyManager proxyManagerSpy, String nodeName) {
    reportNodeFailure(proxyManagerSpy, nodeName, new RuntimeException());
  }

  private void reportNodeFailure(NodeProxyManager proxyManagerSpy, String nodeName, Exception exception) {
    try {
      proxyManagerSpy.reportNodeCommunicationFailure(nodeName, exception);
    } catch (IllegalArgumentException e) {
      assertThat(e).hasMessage("not a proxy instance");
    }
  }
}