All Downloads are FREE. Search and download functionalities are using the official Maven repository.

com.google.inject.internal.InternalContext Maven / Gradle / Ivy

There is a newer version: 3.0.0-alpha-3
Show newest version
/*
 * Copyright (C) 2006 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.internal;

import com.google.inject.internal.InjectorImpl.InjectorOptions;
import com.google.inject.spi.Dependency;
import java.util.IdentityHashMap;

/**
 * Internal context. Used to coordinate injections and support circular dependencies.
 *
 * @author [email protected] (Bob Lee)
 */
final class InternalContext implements AutoCloseable {

  private final InjectorOptions options;

  private final IdentityHashMap> constructionContexts =
      new IdentityHashMap<>();

  /** Keeps track of the type that is currently being requested for injection. */
  private Dependency dependency;

  /**
   * The number of times {@link #enter()} has been called + 1 for initial construction. This value
   * is decremented when {@link #exit()} is called.
   */
  private int enterCount;

  /**
   * A single element array to clear when the {@link #enterCount} hits {@code 0}.
   *
   * 

This is the value stored in the {@code InjectorImpl.localContext} thread local. */ private final Object[] toClear; InternalContext(InjectorOptions options, Object[] toClear) { this.options = options; this.toClear = toClear; this.enterCount = 1; } /** Should only be called by InjectorImpl.enterContext(). */ void enter() { enterCount++; } /** Should be called any any method that received an instance via InjectorImpl.enterContext(). */ @Override public void close() { int newCount = --enterCount; if (newCount < 0) { throw new IllegalStateException("Called close() too many times"); } if (newCount == 0) { toClear[0] = null; } } InjectorOptions getInjectorOptions() { return options; } @SuppressWarnings("unchecked") ConstructionContext getConstructionContext(Object key) { ConstructionContext constructionContext = (ConstructionContext) constructionContexts.get(key); if (constructionContext == null) { constructionContext = new ConstructionContext<>(); constructionContexts.put(key, constructionContext); } return constructionContext; } Dependency getDependency() { return dependency; } /** * Used to set the current dependency. * *

The currentDependency field is only used by InternalFactoryToProviderAdapter to propagate * information to singleton scope. See comments in that class about alternatives. */ void setDependency(Dependency dependency) { this.dependency = dependency; } }





© 2015 - 2024 Weber Informatics LLC | Privacy Policy