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Java example source code file (ScopeRequestIntegrationTest.java)

This example Java source code file (ScopeRequestIntegrationTest.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

a_value, caller, exception, executionexception, inject, injector, interruptedexception, offrequestcallable, override, provider, servlet, servletmodule, shouldneverbeseen, someobject, string, threading, threads, util

The ScopeRequestIntegrationTest.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 com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import com.google.inject.Guice;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.OutOfScopeException;
import com.google.inject.Provider;
import com.google.inject.ProvisionException;
import com.google.inject.Singleton;
import com.google.inject.name.Named;
import com.google.inject.name.Names;

import junit.framework.TestCase;

import java.io.IOException;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

import javax.servlet.ServletException;

/**
 * Tests continuation of requests
 */

public class ScopeRequestIntegrationTest extends TestCase {
  private static final String A_VALUE = "thereaoskdao";
  private static final String A_DIFFERENT_VALUE = "hiaoskd";

  private static final String SHOULDNEVERBESEEN = "Shouldneverbeseen!";

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

    // We use servlet module here because we want to test that @RequestScoped
    // behaves properly with the non-HTTP request scope logic.
    Injector injector = Guice.createInjector(new ServletModule() {
      @Override protected void configureServlets() {
        bindConstant().annotatedWith(Names.named(SomeObject.INVALID)).to(SHOULDNEVERBESEEN);
        bind(SomeObject.class).in(RequestScoped.class);
      }
    });

    SomeObject someObject = new SomeObject(A_VALUE);
    OffRequestCallable offRequestCallable = injector.getInstance(OffRequestCallable.class);
    executor.submit(ServletScopes.scopeRequest(offRequestCallable,
        ImmutableMap.<Keyof(Key.get(SomeObject.class), someObject))).get();

    assertSame(injector.getInstance(OffRequestCallable.class), offRequestCallable);

    // Make sure the value was passed on.
    assertEquals(someObject.value, offRequestCallable.value);
    assertFalse(SHOULDNEVERBESEEN.equals(someObject.value));

    // Now create a new request and assert that the scopes don't cross.
    someObject = new SomeObject(A_DIFFERENT_VALUE);
    executor.submit(ServletScopes.scopeRequest(offRequestCallable,
        ImmutableMap.<Keyof(Key.get(SomeObject.class), someObject))).get();

    assertSame(injector.getInstance(OffRequestCallable.class), offRequestCallable);

    // Make sure the value was passed on.
    assertEquals(someObject.value, offRequestCallable.value);
    assertFalse(SHOULDNEVERBESEEN.equals(someObject.value));
    executor.shutdown();
    executor.awaitTermination(2, TimeUnit.SECONDS);
  }

  public final void testWrongValueClasses() throws Exception {
    Injector injector = Guice.createInjector(new ServletModule() {
      @Override protected void configureServlets() {
        bindConstant().annotatedWith(Names.named(SomeObject.INVALID)).to(SHOULDNEVERBESEEN);
        bind(SomeObject.class).in(RequestScoped.class);
      }
    });

    OffRequestCallable offRequestCallable = injector.getInstance(OffRequestCallable.class);
    try {
      ServletScopes.scopeRequest(offRequestCallable,
        ImmutableMap.<Keyof(Key.get(SomeObject.class), "Boo!"));
      fail();
    } catch(IllegalArgumentException iae) {
      assertEquals("Value[Boo!] of type[java.lang.String] is not compatible with key[" + Key.get(SomeObject.class) + "]", iae.getMessage());
    }
  }

  public final void testNullReplacement() throws Exception {
    Injector injector = Guice.createInjector(new ServletModule() {
      @Override protected void configureServlets() {
        bindConstant().annotatedWith(Names.named(SomeObject.INVALID)).to(SHOULDNEVERBESEEN);
        bind(SomeObject.class).in(RequestScoped.class);
      }
    });

    Callable<SomeObject> callable = injector.getInstance(Caller.class);
    try {
      assertNotNull(callable.call());
      fail();
    } catch(ProvisionException pe) {
      assertTrue(pe.getCause() instanceof OutOfScopeException);
    }

    // Validate that an actual null entry in the map results in a null injected object.
    Map<Key map = Maps.newHashMap();
    map.put(Key.get(SomeObject.class), null);
    callable = ServletScopes.scopeRequest(injector.getInstance(Caller.class), map);
    assertNull(callable.call());
  }

  @RequestScoped
  public static class SomeObject {
    private static final String INVALID = "invalid";

    @Inject
    public SomeObject(@Named(INVALID) String value) {
      this.value = value;
    }
    private final String value;
  }

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

    public String value;

    public String call() throws Exception {
      // Inside this request, we should always get the same instance.
      assertSame(someObject.get(), someObject.get());

      value = someObject.get().value;
      assertFalse(SHOULDNEVERBESEEN.equals(value));

      return value;
    }
  }

  private static class Caller implements Callable<SomeObject> {
    @Inject Provider<SomeObject> someObject;

    public SomeObject call() throws Exception {
      return someObject.get();
    }
  }
}

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