org.apache.hadoop.gateway.hdfs.dispatch.WebHdfsHaHttpClientDispatchTest.java Source code

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Here is the source code for org.apache.hadoop.gateway.hdfs.dispatch.WebHdfsHaHttpClientDispatchTest.java

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/**
 * 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.gateway.hdfs.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.params.BasicHttpParams;
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.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 WebHdfsHaHttpClientDispatchTest {

    @Test
    public void testConnectivityFailover() throws Exception {
        String serviceName = "WEBHDFS";
        HaDescriptor descriptor = HaDescriptorFactory.createDescriptor();
        descriptor.addServiceConfig(
                HaDescriptorFactory.createServiceConfig(serviceName, "true", "1", "1000", "2", "1000"));
        HaProvider provider = new DefaultHaProvider(descriptor);
        URI uri1 = new URI("http://unreachable-host");
        URI uri2 = new URI("http://reachable-host");
        ArrayList<String> urlList = new ArrayList<String>();
        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.getInitParameter(WebHdfsHaHttpClientDispatch.RESOURCE_ROLE_ATTRIBUTE))
                .andReturn(serviceName).anyTimes();
        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");
                    }
                };
            }
        }).once();
        EasyMock.replay(filterConfig, servletContext, outboundRequest, inboundRequest, outboundResponse);
        Assert.assertEquals(uri1.toString(), provider.getActiveURL(serviceName));
        WebHdfsHaHttpClientDispatch dispatch = new WebHdfsHaHttpClientDispatch();
        dispatch.init(filterConfig);
        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);
    }
}