Merge "Change AppSearchManagerService's thread pool to use LinkedBlockingQueue." into sc-dev

import java.util.Objects;

import java.util.Set;

import java.util.concurrent.Executor;

import java.util.concurrent.SynchronousQueue;

import java.util.concurrent.LinkedBlockingQueue;

import java.util.concurrent.ThreadPoolExecutor;

import java.util.concurrent.TimeUnit;

    // mutate requests will need to gain write lock and query requests need to gain read lock.

    private static final Executor EXECUTOR = new ThreadPoolExecutor(/*corePoolSize=*/1,

            Runtime.getRuntime().availableProcessors(), /*keepAliveTime*/ 60L, TimeUnit.SECONDS,

            new SynchronousQueue<Runnable>());

            new LinkedBlockingQueue<>());

    // Cache of unlocked user ids so we don't have to query UserManager service each time. The

    // "locked" suffix refers to the fact that access to the field should be locked; unrelated to