Java tutorial
/** * 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 * <p> * http://www.apache.org/licenses/LICENSE-2.0 * <p> * 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.gateway.rm.dispatch; import org.apache.hadoop.gateway.ha.provider.HaDescriptor; import org.apache.hadoop.gateway.ha.provider.HaProvider; import org.apache.hadoop.gateway.ha.provider.HaServletContextListener; import org.apache.hadoop.gateway.ha.provider.impl.DefaultHaProvider; import org.apache.hadoop.gateway.ha.provider.impl.HaDescriptorFactory; import org.apache.http.client.methods.HttpRequestBase; import org.apache.http.client.methods.HttpUriRequest; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.params.BasicHttpParams; import org.apache.http.entity.StringEntity; import org.apache.http.entity.ContentType; import org.apache.http.Header; import org.apache.http.message.BasicHttpResponse; import org.apache.http.ProtocolVersion; import org.apache.http.StatusLine; import org.apache.http.message.BasicStatusLine; import org.apache.http.message.BasicHeader; import org.easymock.EasyMock; import org.easymock.IAnswer; import org.junit.Assert; import org.junit.Test; import javax.servlet.FilterConfig; import javax.servlet.ServletContext; import javax.servlet.WriteListener; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.net.URI; import java.util.ArrayList; import java.util.concurrent.atomic.AtomicInteger; public class RMHaDispatchTest { private static final String LOCATION = "Location"; @Test public void testConnectivityFailure() throws Exception { String serviceName = "RESOURCEMANAGER"; HaDescriptor descriptor = HaDescriptorFactory.createDescriptor(); descriptor.addServiceConfig( HaDescriptorFactory.createServiceConfig(serviceName, "true", "1", "1000", "2", "1000", null, null)); HaProvider provider = new DefaultHaProvider(descriptor); URI uri1 = new URI("http://unreachable-host"); URI uri2 = new URI("http://reachable-host"); ArrayList<String> urlList = new ArrayList<>(); urlList.add(uri1.toString()); urlList.add(uri2.toString()); provider.addHaService(serviceName, urlList); FilterConfig filterConfig = EasyMock.createNiceMock(FilterConfig.class); ServletContext servletContext = EasyMock.createNiceMock(ServletContext.class); EasyMock.expect(filterConfig.getServletContext()).andReturn(servletContext).anyTimes(); EasyMock.expect(servletContext.getAttribute(HaServletContextListener.PROVIDER_ATTRIBUTE_NAME)) .andReturn(provider).anyTimes(); BasicHttpParams params = new BasicHttpParams(); HttpUriRequest outboundRequest = EasyMock.createNiceMock(HttpRequestBase.class); EasyMock.expect(outboundRequest.getMethod()).andReturn("GET").anyTimes(); EasyMock.expect(outboundRequest.getURI()).andReturn(uri1).anyTimes(); EasyMock.expect(outboundRequest.getParams()).andReturn(params).anyTimes(); HttpServletRequest inboundRequest = EasyMock.createNiceMock(HttpServletRequest.class); EasyMock.expect(inboundRequest.getRequestURL()).andReturn(new StringBuffer(uri2.toString())).once(); EasyMock.expect(inboundRequest.getAttribute("dispatch.ha.failover.counter")).andReturn(new AtomicInteger(0)) .once(); EasyMock.expect(inboundRequest.getAttribute("dispatch.ha.failover.counter")).andReturn(new AtomicInteger(1)) .once(); HttpServletResponse outboundResponse = EasyMock.createNiceMock(HttpServletResponse.class); EasyMock.expect(outboundResponse.getOutputStream()).andAnswer(new IAnswer<ServletOutputStream>() { @Override public ServletOutputStream answer() throws Throwable { return new ServletOutputStream() { @Override public void write(int b) throws IOException { throw new IOException("unreachable-host"); } @Override public void setWriteListener(WriteListener arg0) { } @Override public boolean isReady() { return false; } }; } }).once(); EasyMock.replay(filterConfig, servletContext, outboundRequest, inboundRequest, outboundResponse); Assert.assertEquals(uri1.toString(), provider.getActiveURL(serviceName)); RMHaDispatch dispatch = new RMHaDispatch(); dispatch.setHttpClient(new DefaultHttpClient()); dispatch.setHaProvider(provider); dispatch.init(); long startTime = System.currentTimeMillis(); try { dispatch.executeRequest(outboundRequest, inboundRequest, outboundResponse); } catch (IOException e) { //this is expected after the failover limit is reached } long elapsedTime = System.currentTimeMillis() - startTime; Assert.assertEquals(uri2.toString(), provider.getActiveURL(serviceName)); //test to make sure the sleep took place Assert.assertTrue(elapsedTime > 1000); } @Test public void testConnectivityFailover() throws Exception { String serviceName = "RESOURCEMANAGER"; HaDescriptor descriptor = HaDescriptorFactory.createDescriptor(); descriptor.addServiceConfig( HaDescriptorFactory.createServiceConfig(serviceName, "true", "1", "1000", "2", "1000", null, null)); HaProvider provider = new DefaultHaProvider(descriptor); URI uri1 = new URI("http://passive-host"); URI uri2 = new URI("http://other-host"); URI uri3 = new URI("http://active-host"); ArrayList<String> urlList = new ArrayList<>(); urlList.add(uri1.toString()); urlList.add(uri2.toString()); urlList.add(uri3.toString()); provider.addHaService(serviceName, urlList); FilterConfig filterConfig = EasyMock.createNiceMock(FilterConfig.class); ServletContext servletContext = EasyMock.createNiceMock(ServletContext.class); EasyMock.expect(filterConfig.getServletContext()).andReturn(servletContext).anyTimes(); EasyMock.expect(servletContext.getAttribute(HaServletContextListener.PROVIDER_ATTRIBUTE_NAME)) .andReturn(provider).anyTimes(); BasicHttpResponse inboundResponse = EasyMock.createNiceMock(BasicHttpResponse.class); EasyMock.expect(inboundResponse.getStatusLine()).andReturn(getStatusLine()).anyTimes(); EasyMock.expect(inboundResponse.getEntity()).andReturn(getResponseEntity()).anyTimes(); EasyMock.expect(inboundResponse.getFirstHeader(LOCATION)).andReturn(getFirstHeader(uri3.toString())) .anyTimes(); BasicHttpParams params = new BasicHttpParams(); HttpUriRequest outboundRequest = EasyMock.createNiceMock(HttpRequestBase.class); EasyMock.expect(outboundRequest.getMethod()).andReturn("GET").anyTimes(); EasyMock.expect(outboundRequest.getURI()).andReturn(uri1).anyTimes(); EasyMock.expect(outboundRequest.getParams()).andReturn(params).anyTimes(); HttpServletRequest inboundRequest = EasyMock.createNiceMock(HttpServletRequest.class); EasyMock.expect(inboundRequest.getRequestURL()).andReturn(new StringBuffer(uri2.toString())).once(); EasyMock.expect(inboundRequest.getAttribute("dispatch.ha.failover.counter")).andReturn(new AtomicInteger(0)) .once(); EasyMock.expect(inboundRequest.getAttribute("dispatch.ha.failover.counter")).andReturn(new AtomicInteger(1)) .once(); HttpServletResponse outboundResponse = EasyMock.createNiceMock(HttpServletResponse.class); EasyMock.expect(outboundResponse.getOutputStream()).andAnswer(new IAnswer<ServletOutputStream>() { @Override public ServletOutputStream answer() throws Throwable { return new ServletOutputStream() { @Override public void write(int b) throws IOException { throw new IOException("unreachable-host"); } @Override public void setWriteListener(WriteListener arg0) { } @Override public boolean isReady() { return false; } }; } }).once(); Assert.assertEquals(uri1.toString(), provider.getActiveURL(serviceName)); EasyMock.replay(filterConfig, servletContext, inboundResponse, outboundRequest, inboundRequest, outboundResponse); RMHaDispatch dispatch = new RMHaDispatch(); dispatch.setHttpClient(new DefaultHttpClient()); dispatch.setHaProvider(provider); dispatch.init(); long startTime = System.currentTimeMillis(); try { dispatch.setInboundResponse(inboundResponse); dispatch.executeRequest(outboundRequest, inboundRequest, outboundResponse); } catch (IOException e) { //this is expected after the failover limit is reached } Assert.assertEquals(uri3.toString(), dispatch.getUriFromInbound(inboundRequest, inboundResponse, null).toString()); long elapsedTime = System.currentTimeMillis() - startTime; Assert.assertEquals(uri3.toString(), provider.getActiveURL(serviceName)); //test to make sure the sleep took place Assert.assertTrue(elapsedTime > 1000); } private StringEntity getResponseEntity() { String body = "This is standby RM"; return new StringEntity(body, ContentType.TEXT_HTML); } private StatusLine getStatusLine() { ProtocolVersion p = new ProtocolVersion("HTTP", 1, 1); return new BasicStatusLine(p, 307, "Code" + 307); } private Header getFirstHeader(String host) { return new BasicHeader(LOCATION, host); } }