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Java example source code file (ContinuingRequestIntegrationTest.java)

This example Java source code file (ContinuingRequestIntegrationTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractexecutorservice, executorservice, filterchain, guicefilter, http, httpservletrequest, inject, interruptedexception, ioexception, override, provider, request, response, servlet, servletexception, singleton, someobject, string, threading, threads

The ContinuingRequestIntegrationTest.java Java example source code

/**
 * Copyright (C) 2010 Google Inc.
 *
 * 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.google.inject.servlet;

import javax.servlet.http.Cookie;
import static org.easymock.EasyMock.createMock;
import static org.easymock.EasyMock.expect;
import static org.easymock.EasyMock.replay;
import static org.easymock.EasyMock.verify;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.inject.Guice;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Provider;
import com.google.inject.Singleton;

import junit.framework.TestCase;

import java.io.IOException;
import java.util.List;
import java.util.concurrent.AbstractExecutorService;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;

import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Tests continuation of requests
 */

public class ContinuingRequestIntegrationTest extends TestCase {
  private static final String PARAM_VALUE = "there";
  private static final String PARAM_NAME = "hi";

  private final AtomicBoolean failed = new AtomicBoolean(false);
  private final AbstractExecutorService sameThreadExecutor = new AbstractExecutorService() {
    public void shutdown() {
    }

    public List<Runnable> shutdownNow() {
      return ImmutableList.of();
    }

    public boolean isShutdown() {
      return true;
    }

    public boolean isTerminated() {
      return true;
    }

    public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException {
      return true;
    }

    public void execute(Runnable command) {
      command.run();
    }

    @Override public <T> Future submit(Callable task) {
      try {
        task.call();
        fail();
      } catch (Exception e) {
        // Expected.
        assertTrue(e instanceof IllegalStateException);
        failed.set(true);
      }

      return null;
    }
  };

  private ExecutorService executor;
  private Injector injector;

  @Override protected void tearDown() throws Exception {
    injector.getInstance(GuiceFilter.class).destroy();
  }

  public final void testRequestContinuesInOtherThread()
      throws ServletException, IOException, InterruptedException {
    executor = Executors.newSingleThreadExecutor();

    injector = Guice.createInjector(new ServletModule() {
      @Override protected void configureServlets() {
        serve("/*").with(ContinuingServlet.class);

        bind(ExecutorService.class).toInstance(executor);
      }
    });

    FilterConfig filterConfig = createMock(FilterConfig.class);
    expect(filterConfig.getServletContext()).andReturn(createMock(ServletContext.class));

    GuiceFilter guiceFilter = injector.getInstance(GuiceFilter.class);

    HttpServletRequest request = createMock(HttpServletRequest.class);

    expect(request.getRequestURI()).andReturn("/");
    expect(request.getContextPath())
        .andReturn("")
        .anyTimes();
    expect(request.getMethod()).andReturn("GET");
    expect(request.getCookies()).andReturn(new Cookie[0]);

    FilterChain filterChain = createMock(FilterChain.class);
    expect(request.getParameter(PARAM_NAME)).andReturn(PARAM_VALUE);

    replay(request, filterConfig, filterChain);

    guiceFilter.init(filterConfig);
    guiceFilter.doFilter(request, null, filterChain);

    // join.
    executor.shutdown();
    executor.awaitTermination(10, TimeUnit.SECONDS);

    assertEquals(PARAM_VALUE, injector.getInstance(OffRequestCallable.class).value);
    verify(request, filterConfig, filterChain);
  }

  public final void testRequestContinuationDiesInHttpRequestThread()
      throws ServletException, IOException, InterruptedException {
    executor = sameThreadExecutor;
    injector = Guice.createInjector(new ServletModule() {
      @Override protected void configureServlets() {
        serve("/*").with(ContinuingServlet.class);

        bind(ExecutorService.class).toInstance(executor);

        bind(SomeObject.class);
      }
    });

    FilterConfig filterConfig = createMock(FilterConfig.class);
    expect(filterConfig.getServletContext()).andReturn(createMock(ServletContext.class));

    GuiceFilter guiceFilter = injector.getInstance(GuiceFilter.class);

    HttpServletRequest request = createMock(HttpServletRequest.class);

    expect(request.getRequestURI()).andReturn("/");
    expect(request.getContextPath())
        .andReturn("")
        .anyTimes();

    expect(request.getMethod()).andReturn("GET");
    expect(request.getCookies()).andReturn(new Cookie[0]);
    FilterChain filterChain = createMock(FilterChain.class);

    replay(request, filterConfig, filterChain);

    guiceFilter.init(filterConfig);
    guiceFilter.doFilter(request, null, filterChain);

    // join.
    executor.shutdown();
    executor.awaitTermination(10, TimeUnit.SECONDS);

    assertTrue(failed.get());
    assertFalse(PARAM_VALUE.equals(injector.getInstance(OffRequestCallable.class).value));

    verify(request, filterConfig, filterChain);
  }

  @RequestScoped
  public static class SomeObject {
  }

  @Singleton
  public static class ContinuingServlet extends HttpServlet {
    @Inject OffRequestCallable callable;
    @Inject ExecutorService executorService;

    private SomeObject someObject;

    @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp)
        throws ServletException, IOException {
      assertNull(someObject);

      // Seed with someobject.
      someObject = new SomeObject();
      Callable<String> task = ServletScopes.continueRequest(callable,
          ImmutableMap.<Keyof(Key.get(SomeObject.class), someObject));

      executorService.submit(task);
    }
  }

  @Singleton
  public static class OffRequestCallable implements Callable<String> {
    @Inject Provider<HttpServletRequest> request;
    @Inject Provider<HttpServletResponse> response;
    @Inject Provider<SomeObject> someObject;

    public String value;

    public String call() throws Exception {
      assertNull(response.get());

      // Inside this request, we should always get the same instance.
      assertSame(someObject.get(), someObject.get());

      return value = request.get().getParameter(PARAM_NAME);
    }
  }
}

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