Android Open Source - lightbox-android-webservices Background Task Weak

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License

The source code is released under:

Apache License

Java Source Code

/**
 * Copyright (c) 2012 Lightbox//ww w. j a va 2 s.  c om
 *
 * 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.lightbox.android.tasks;

import java.lang.ref.WeakReference;
import java.util.concurrent.ExecutorService;

/** 
 * A {@link BackgroundTask} that helps you keep a {@link WeakReference} to an Activity, Service, or whatever you want.
 * This will helps you avoid memory leaks.
 * @author Fabien Devos
 */
public abstract class BackgroundTaskWeak<TReference, TResult> extends BackgroundTask<TResult> {
  /** Used to tag logs */
  @SuppressWarnings("unused")
  private static final String TAG = "BackgroundTaskWeak";

  private WeakReference<TReference> mWeakReference;

  //----------------------------------------------
  // Constructors
  
  /**
   * Constructor.
   */
  public BackgroundTaskWeak(TReference ref) {
    this(ref, null);
  }

  /**
   * Constructor.
   */
  public BackgroundTaskWeak(TReference ref, ExecutorService executor) {
    super(executor);
    mWeakReference = new WeakReference<TReference>(ref);
  }

  //----------------------------------------------
  // Reference

  @Override
  public void cancel() {
    super.cancel();
    mWeakReference.clear();
  }
  
  /**
   * @return The weakly referenced object, or null if it doesn't exist anymore.
   */
  public TReference getRef() {
    return mWeakReference.get();
  }
  
  /**
   * Set an object as weakly referenced. Will erase the previously set one.
   * @param ref the reference to set
   */
  public void setRef(TReference ref) {
    mWeakReference.clear();
    mWeakReference = new WeakReference<TReference>(ref);
  }
  

}

Java Source Code List

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