BlockingFind.java
/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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 androidx.test.services.shellexecutor;
import android.content.Context;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;
import androidx.test.services.speakeasy.SpeakEasyProtocol.FindResult;
import androidx.test.services.speakeasy.client.AppAtslConnection;
import androidx.test.services.speakeasy.client.AppConnection;
import androidx.test.services.speakeasy.client.FindResultReceiver;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
/**
* Synchronously gets a {@link FindResult} from SpeakEasy
*
* @throws InterruptedException if find not successful in 5 seconds.
*/
final class BlockingFind extends FindResultReceiver {
private static final String TAG = "FindResultReceiver";
private static final int WAIT_TIME = 30;
private static final int WAIT_INTERVAL = 5;
private final CountDownLatch latch;
private List<FindResult> findResults = new CopyOnWriteArrayList<>();
private BlockingFind(Handler h) {
super(h);
latch = new CountDownLatch(1);
}
@Override
protected void handleFindResult(FindResult findResult) {
this.findResults.add(findResult);
if (findResult.found || findResults.size() == 2) {
// notify as soon as we have found one result, or we have all the results back
latch.countDown();
}
}
private List<FindResult> waitOnResults() throws InterruptedException {
int awaitTime = 0;
while (true) {
if (latch.await(WAIT_INTERVAL, TimeUnit.SECONDS)) {
return findResults;
} else {
awaitTime += WAIT_INTERVAL;
if (awaitTime < WAIT_TIME) {
Log.i(TAG, "Waiting " + awaitTime + " for SpeakEasy find");
} else {
throw new InterruptedException(
"Timed out after " + WAIT_TIME + " seconds while waiting for SpeakEasy find");
}
}
}
}
public static FindResult getResult(Looper looper, Context context, String key)
throws InterruptedException {
// connect to both android.support.test and androidx.test speakeasy in parallel
BlockingFind receiver = new BlockingFind(new Handler(looper));
new AppConnection(context).find(key, receiver);
new AppAtslConnection(context).find(key, receiver);
List<FindResult> results = receiver.waitOnResults();
return getBestResult(results);
}
private static FindResult getBestResult(List<FindResult> results) {
FindResult bestResult = null;
for (FindResult result : results) {
if (result.found) {
bestResult = result;
} else if (bestResult == null) {
bestResult = result;
}
}
return bestResult;
}
}