Android Open Source - storm-gen Abstract Async Task Loader

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License

The source code is released under:

Apache License

Java Source Code

package com.turbomanage.storm.sample.loader;
//from w  w w . j av a  2 s .  co m
import android.content.Context;
import android.support.v4.content.AsyncTaskLoader;

public abstract class AbstractAsyncTaskLoader<T> extends AsyncTaskLoader<T> {
  
  private T mResult;

  public AbstractAsyncTaskLoader(Context context) {
    super(context);
  }
  
  @Override
  protected void onStartLoading() {
    if (mResult != null) {
      // If we currently have a result available, deliver it
            // immediately.
      deliverResult(mResult);
    }
    
    if (takeContentChanged() || mResult == null) {
      // If the data has changed since the last time it was loaded
            // or is not currently available, start a load.
      forceLoad();
    }
  }

  @Override
  protected void onStopLoading() {
    // Attempt to cancel the current load task if possible.
    cancelLoad();
  }
  
  @Override
  public void onCanceled(T result) {
        super.onCanceled(result);

        // At this point we can release the resources associated with the result
        // if needed.
        onReleaseResources(result);
    }

  @Override
  protected void onReset() {
    super.onReset();
    stopLoading();
    mResult = null;
  }
  
  @Override
  public void deliverResult(T data) {
    if (isReset()) {
            // An async query came in while the loader is stopped.  We
            // don't need the result.
            if (data != null) {
                onReleaseResources(data);
            }
        }
    
    // Release resources associated with the previous value
        if (mResult != null) {
            onReleaseResources(mResult);
        }
    
    mResult = data;
    
    if (isStarted()) {
      // If the Loader is currently started, we can immediately
            // deliver its results.
      super.deliverResult(data);
    }
  }
  
  /**
     * Helper function to take care of releasing resources associated
     * with an actively loaded data set. Override it if necessary.
     */
    protected void onReleaseResources(T resource) {
        // For a simple objects there is nothing to do.
        // For something like a Cursor, we would close it here.
    }
}

Java Source Code List

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