Merge "SharedPreferences: replace per-load threads with single thread" into udc-qpr-dev

import java.util.Set;

import java.util.WeakHashMap;

import java.util.concurrent.CountDownLatch;

import java.util.concurrent.Executors;

import java.util.concurrent.LinkedBlockingQueue;

import java.util.concurrent.ThreadFactory;

import java.util.concurrent.ThreadPoolExecutor;

import java.util.concurrent.TimeUnit;

final class SharedPreferencesImpl implements SharedPreferences {

    private static final String TAG = "SharedPreferencesImpl";

    private final ExponentiallyBucketedHistogram mSyncTimes = new ExponentiallyBucketedHistogram(16);

    private int mNumSync = 0;

    private static final ThreadPoolExecutor sLoadExecutor = new ThreadPoolExecutor(0, 1, 10L,

            TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>(),

            new SharedPreferencesThreadFactory());

    @UnsupportedAppUsage

    SharedPreferencesImpl(File file, int mode) {

        mFile = file;

        synchronized (mLock) {

            mLoaded = false;

        }

        new Thread("SharedPreferencesImpl-load") {

            public void run() {

        sLoadExecutor.execute(() -> {

            loadFromDisk();

            }

        }.start();

        });

    }

    private void loadFromDisk() {

        }

        mcr.setDiskWriteResult(false, false);

    }

    private static final class SharedPreferencesThreadFactory implements ThreadFactory {

        @Override

        public Thread newThread(Runnable runnable) {

            Thread thread = Executors.defaultThreadFactory().newThread(runnable);

            thread.setName("SharedPreferences");

            return thread;

        }

    }

}