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/*
* Copyright (C) 2016 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 com.android.server.pm;
import android.content.pm.PackageParser;
import android.os.Process;
import android.os.Trace;
import android.util.DisplayMetrics;
import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.util.ConcurrentUtils;
import java.io.File;
import java.util.List;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import static android.os.Trace.TRACE_TAG_PACKAGE_MANAGER;
/**
* Helper class for parallel parsing of packages using {@link PackageParser}.
* <p>Parsing requests are processed by a thread-pool of {@link #MAX_THREADS}.
* At any time, at most {@link #QUEUE_CAPACITY} results are kept in RAM</p>
*/
class ParallelPackageParser implements AutoCloseable {
private static final int QUEUE_CAPACITY = 10;
private static final int MAX_THREADS = 4;
private final String[] mSeparateProcesses;
private final boolean mOnlyCore;
private final DisplayMetrics mMetrics;
private final File mCacheDir;
private final PackageParser.Callback mPackageParserCallback;
private volatile String mInterruptedInThread;
private final BlockingQueue<ParseResult> mQueue = new ArrayBlockingQueue<>(QUEUE_CAPACITY);
private final ExecutorService mService = ConcurrentUtils.newFixedThreadPool(MAX_THREADS,
"package-parsing-thread", Process.THREAD_PRIORITY_FOREGROUND);
ParallelPackageParser(String[] separateProcesses, boolean onlyCoreApps,
DisplayMetrics metrics, File cacheDir, PackageParser.Callback callback) {
mSeparateProcesses = separateProcesses;
mOnlyCore = onlyCoreApps;
mMetrics = metrics;
mCacheDir = cacheDir;
mPackageParserCallback = callback;
}
static class ParseResult {
PackageParser.Package pkg; // Parsed package
File scanFile; // File that was parsed
Throwable throwable; // Set if an error occurs during parsing
@Override
public String toString() {
return "ParseResult{" +
"pkg=" + pkg +
", scanFile=" + scanFile +
", throwable=" + throwable +
'}';
}
}
/**
* Take the parsed package from the parsing queue, waiting if necessary until the element
* appears in the queue.
* @return parsed package
*/
public ParseResult take() {
try {
if (mInterruptedInThread != null) {
throw new InterruptedException("Interrupted in " + mInterruptedInThread);
}
return mQueue.take();
} catch (InterruptedException e) {
// We cannot recover from interrupt here
Thread.currentThread().interrupt();
throw new IllegalStateException(e);
}
}
/**
* Submits the file for parsing
* @param scanFile file to scan
* @param parseFlags parse falgs
*/
public void submit(File scanFile, int parseFlags) {
mService.submit(() -> {
ParseResult pr = new ParseResult();
Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "parallel parsePackage [" + scanFile + "]");
try {
PackageParser pp = new PackageParser();
pp.setSeparateProcesses(mSeparateProcesses);
pp.setOnlyCoreApps(mOnlyCore);
pp.setDisplayMetrics(mMetrics);
pp.setCacheDir(mCacheDir);
pp.setCallback(mPackageParserCallback);
pr.scanFile = scanFile;
pr.pkg = parsePackage(pp, scanFile, parseFlags);
} catch (Throwable e) {
pr.throwable = e;
} finally {
Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);
}
try {
mQueue.put(pr);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
// Propagate result to callers of take().
// This is helpful to prevent main thread from getting stuck waiting on
// ParallelPackageParser to finish in case of interruption
mInterruptedInThread = Thread.currentThread().getName();
}
});
}
@VisibleForTesting
protected PackageParser.Package parsePackage(PackageParser packageParser, File scanFile,
int parseFlags) throws PackageParser.PackageParserException {
return packageParser.parsePackage(scanFile, parseFlags, true /* useCaches */);
}
@Override
public void close() {
List<Runnable> unfinishedTasks = mService.shutdownNow();
if (!unfinishedTasks.isEmpty()) {
throw new IllegalStateException("Not all tasks finished before calling close: "
+ unfinishedTasks);
}
}
}
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