102 lines
3.9 KiB
Java
102 lines
3.9 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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package android.test;
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import android.content.Loader;
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import android.content.Loader.OnLoadCompleteListener;
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import android.os.AsyncTask;
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import android.os.Handler;
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import android.os.Looper;
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import android.os.Message;
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import java.util.concurrent.ArrayBlockingQueue;
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/**
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* A convenience class for testing {@link Loader}s. This test case
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* provides a simple way to synchronously get the result from a Loader making
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* it easy to assert that the Loader returns the expected result.
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*/
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public class LoaderTestCase extends AndroidTestCase {
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static {
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// Force class loading of AsyncTask on the main thread so that it's handlers are tied to
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// the main thread and responses from the worker thread get delivered on the main thread.
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// The tests are run on another thread, allowing them to block waiting on a response from
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// the code running on the main thread. The main thread can't block since the AysncTask
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// results come in via the event loop.
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new AsyncTask<Void, Void, Void>() {
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@Override
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protected Void doInBackground(Void... args) {return null;}
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@Override
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protected void onPostExecute(Void result) {}
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};
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}
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/**
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* Runs a Loader synchronously and returns the result of the load. The loader will
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* be started, stopped, and destroyed by this method so it cannot be reused.
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*
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* @param loader The loader to run synchronously
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* @return The result from the loader
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*/
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public <T> T getLoaderResultSynchronously(final Loader<T> loader) {
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// The test thread blocks on this queue until the loader puts it's result in
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final ArrayBlockingQueue<T> queue = new ArrayBlockingQueue<T>(1);
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// This callback runs on the "main" thread and unblocks the test thread
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// when it puts the result into the blocking queue
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final OnLoadCompleteListener<T> listener = new OnLoadCompleteListener<T>() {
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@Override
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public void onLoadComplete(Loader<T> completedLoader, T data) {
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// Shut the loader down
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completedLoader.unregisterListener(this);
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completedLoader.stopLoading();
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completedLoader.destroy();
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// Store the result, unblocking the test thread
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queue.add(data);
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}
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};
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// This handler runs on the "main" thread of the process since AsyncTask
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// is documented as needing to run on the main thread and many Loaders use
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// AsyncTask
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final Handler mainThreadHandler = new Handler(Looper.getMainLooper()) {
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@Override
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public void handleMessage(Message msg) {
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loader.registerListener(0, listener);
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loader.startLoading();
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}
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};
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// Ask the main thread to start the loading process
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mainThreadHandler.sendEmptyMessage(0);
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// Block on the queue waiting for the result of the load to be inserted
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T result;
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while (true) {
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try {
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result = queue.take();
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break;
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} catch (InterruptedException e) {
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throw new RuntimeException("waiting thread interrupted", e);
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}
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}
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return result;
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}
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}
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