Java tutorial
/* Copyright 2009, 2012 predic8 GmbH, www.predic8.com 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 com.predic8.membrane.interceptor; import static org.junit.Assert.assertEquals; import java.net.MalformedURLException; import java.net.URISyntaxException; import java.util.List; import com.predic8.membrane.core.http.Request; import com.predic8.membrane.core.util.URIFactory; import com.predic8.membrane.core.util.URLUtil; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.HttpVersion; import org.apache.commons.httpclient.methods.InputStreamRequestEntity; import org.apache.commons.httpclient.methods.PostMethod; import org.apache.http.params.HttpProtocolParams; import org.junit.After; import org.junit.Before; import org.junit.Test; import com.predic8.membrane.core.HttpRouter; import com.predic8.membrane.core.exchange.Exchange; import com.predic8.membrane.core.http.Header; import com.predic8.membrane.core.http.MimeType; import com.predic8.membrane.core.http.Response; import com.predic8.membrane.core.interceptor.AbstractInterceptor; import com.predic8.membrane.core.interceptor.HTTPClientInterceptor; import com.predic8.membrane.core.interceptor.Interceptor; import com.predic8.membrane.core.interceptor.Outcome; import com.predic8.membrane.core.interceptor.balancer.BalancerUtil; import com.predic8.membrane.core.interceptor.balancer.ByThreadStrategy; import com.predic8.membrane.core.interceptor.balancer.DispatchingStrategy; import com.predic8.membrane.core.interceptor.balancer.LoadBalancingInterceptor; import com.predic8.membrane.core.interceptor.balancer.Node; import com.predic8.membrane.core.interceptor.balancer.RoundRobinStrategy; import com.predic8.membrane.core.rules.ServiceProxy; import com.predic8.membrane.core.rules.ServiceProxyKey; import com.predic8.membrane.core.services.DummyWebServiceInterceptor; import com.predic8.membrane.integration.Http11Test; public class LoadBalancingInterceptorTest { private DummyWebServiceInterceptor mockInterceptor1; private DummyWebServiceInterceptor mockInterceptor2; protected LoadBalancingInterceptor balancingInterceptor; private DispatchingStrategy roundRobinStrategy; private DispatchingStrategy byThreadStrategy; private HttpRouter service1; private HttpRouter service2; protected HttpRouter balancer; @Before public void setUp() throws Exception { service1 = new HttpRouter(); mockInterceptor1 = new DummyWebServiceInterceptor(); ServiceProxy sp1 = new ServiceProxy(new ServiceProxyKey("localhost", "POST", ".*", 2000), "thomas-bayer.com", 80); sp1.getInterceptors().add(new AbstractInterceptor() { @Override public Outcome handleResponse(Exchange exc) throws Exception { exc.getResponse().getHeader().add("Connection", "close"); return Outcome.CONTINUE; } }); sp1.getInterceptors().add(mockInterceptor1); service1.getRuleManager().addProxyAndOpenPortIfNew(sp1); service1.init(); service2 = new HttpRouter(); mockInterceptor2 = new DummyWebServiceInterceptor(); ServiceProxy sp2 = new ServiceProxy(new ServiceProxyKey("localhost", "POST", ".*", 3000), "thomas-bayer.com", 80); sp2.getInterceptors().add(new AbstractInterceptor() { @Override public Outcome handleResponse(Exchange exc) throws Exception { exc.getResponse().getHeader().add("Connection", "close"); return Outcome.CONTINUE; } }); sp2.getInterceptors().add(mockInterceptor2); service2.getRuleManager().addProxyAndOpenPortIfNew(sp2); service2.init(); balancer = new HttpRouter(); ServiceProxy sp3 = new ServiceProxy(new ServiceProxyKey("localhost", "POST", ".*", 7000), "thomas-bayer.com", 80); balancingInterceptor = new LoadBalancingInterceptor(); balancingInterceptor.setName("Default"); sp3.getInterceptors().add(balancingInterceptor); balancer.getRuleManager().addProxyAndOpenPortIfNew(sp3); enableFailOverOn5XX(balancer); balancer.init(); BalancerUtil.lookupBalancer(balancer, "Default").up("Default", "localhost", 2000); BalancerUtil.lookupBalancer(balancer, "Default").up("Default", "localhost", 3000); roundRobinStrategy = new RoundRobinStrategy(); byThreadStrategy = new ByThreadStrategy(); } private void enableFailOverOn5XX(HttpRouter balancer2) { List<Interceptor> l = balancer.getTransport().getInterceptors(); ((HTTPClientInterceptor) l.get(l.size() - 1)).setFailOverOn5XX(true); } @After public void tearDown() throws Exception { service1.shutdown(); service2.shutdown(); balancer.shutdown(); } @Test public void testGetDestinationURLWithHostname() throws MalformedURLException, URISyntaxException { doTestGetDestinationURL("http://localhost/axis2/services/BLZService?wsdl", "http://thomas-bayer.com:80/axis2/services/BLZService?wsdl"); } @Test public void testGetDestinationURLWithoutHostname() throws MalformedURLException, URISyntaxException { doTestGetDestinationURL("/axis2/services/BLZService?wsdl", "http://thomas-bayer.com:80/axis2/services/BLZService?wsdl"); } private void doTestGetDestinationURL(String requestUri, String expectedUri) throws URISyntaxException { Exchange exc = new Exchange(null); exc.setRequest(new Request()); exc.getRequest().setUri(URLUtil.getPathQuery(new URIFactory(), requestUri)); exc.setOriginalRequestUri(requestUri); assertEquals(expectedUri, new Node("thomas-bayer.com", 80).getDestinationURL(exc)); } @Test public void testRoundRobinDispachingStrategy() throws Exception { balancingInterceptor.setDispatchingStrategy(roundRobinStrategy); HttpClient client = new HttpClient(); client.getParams().setParameter(HttpProtocolParams.PROTOCOL_VERSION, HttpVersion.HTTP_1_1); PostMethod vari = getPostMethod(); int status = client.executeMethod(vari); //System.out.println(new String(vari.getResponseBody())); assertEquals(200, status); assertEquals(1, mockInterceptor1.getCount()); assertEquals(0, mockInterceptor2.getCount()); assertEquals(200, client.executeMethod(getPostMethod())); assertEquals(1, mockInterceptor1.getCount()); assertEquals(1, mockInterceptor2.getCount()); assertEquals(200, client.executeMethod(getPostMethod())); assertEquals(2, mockInterceptor1.getCount()); assertEquals(1, mockInterceptor2.getCount()); assertEquals(200, client.executeMethod(getPostMethod())); assertEquals(2, mockInterceptor1.getCount()); assertEquals(2, mockInterceptor2.getCount()); } @Test public void testExpect100Continue() throws Exception { balancingInterceptor.setDispatchingStrategy(roundRobinStrategy); HttpClient client = new HttpClient(); Http11Test.initExpect100ContinueWithFastFail(client); PostMethod vari = getPostMethod(); int status = client.executeMethod(vari); assertEquals(200, status); assertEquals(1, mockInterceptor1.getCount()); assertEquals(0, mockInterceptor2.getCount()); assertEquals(200, client.executeMethod(getPostMethod())); assertEquals(1, mockInterceptor1.getCount()); assertEquals(1, mockInterceptor2.getCount()); assertEquals(200, client.executeMethod(getPostMethod())); assertEquals(2, mockInterceptor1.getCount()); assertEquals(1, mockInterceptor2.getCount()); assertEquals(200, client.executeMethod(getPostMethod())); assertEquals(2, mockInterceptor1.getCount()); assertEquals(2, mockInterceptor2.getCount()); } private PostMethod getPostMethod() { PostMethod post = new PostMethod("http://localhost:7000/axis2/services/BLZService"); post.setRequestEntity(new InputStreamRequestEntity(this.getClass().getResourceAsStream("/getBank.xml"))); post.setRequestHeader(Header.CONTENT_TYPE, MimeType.TEXT_XML_UTF8); post.setRequestHeader(Header.SOAP_ACTION, ""); return post; } @Test public void testFailOverOnConnectionRefused() throws Exception { balancingInterceptor.setDispatchingStrategy(roundRobinStrategy); HttpClient client = new HttpClient(); client.getParams().setParameter(HttpProtocolParams.PROTOCOL_VERSION, HttpVersion.HTTP_1_1); assertEquals(200, client.executeMethod(getPostMethod())); assertEquals(1, mockInterceptor1.getCount()); assertEquals(0, mockInterceptor2.getCount()); assertEquals(200, client.executeMethod(getPostMethod())); assertEquals(1, mockInterceptor1.getCount()); assertEquals(1, mockInterceptor2.getCount()); service1.shutdown(); Thread.sleep(1000); assertEquals(200, client.executeMethod(getPostMethod())); assertEquals(1, mockInterceptor1.getCount()); assertEquals(2, mockInterceptor2.getCount()); assertEquals(200, client.executeMethod(getPostMethod())); assertEquals(3, mockInterceptor2.getCount()); } @Test public void testFailOverOnStatus500() throws Exception { balancingInterceptor.setDispatchingStrategy(roundRobinStrategy); HttpClient client = new HttpClient(); client.getParams().setParameter(HttpProtocolParams.PROTOCOL_VERSION, HttpVersion.HTTP_1_1); assertEquals(200, client.executeMethod(getPostMethod())); assertEquals(1, mockInterceptor1.getCount()); assertEquals(0, mockInterceptor2.getCount()); assertEquals(200, client.executeMethod(getPostMethod())); assertEquals(1, mockInterceptor1.getCount()); assertEquals(1, mockInterceptor2.getCount()); ((ServiceProxy) service1.getRuleManager().getRules().get(0)).getInterceptors().add(0, new AbstractInterceptor() { @Override public Outcome handleRequest(Exchange exc) throws Exception { exc.setResponse(Response.internalServerError().build()); return Outcome.ABORT; } }); assertEquals(200, client.executeMethod(getPostMethod())); assertEquals(1, mockInterceptor1.getCount()); assertEquals(2, mockInterceptor2.getCount()); assertEquals(200, client.executeMethod(getPostMethod())); assertEquals(3, mockInterceptor2.getCount()); } @Test public void testByThreadStrategy() throws Exception { balancingInterceptor.setDispatchingStrategy(byThreadStrategy); } }