Remove PrioritizedSerialExecutor.

Bug: 15320560
Change-Id: Icb88a96ebd685da1d2cba7b07889a2751c603a2e

4 files changed, 82 insertions, 249 deletions

diff --git a/java/src/com/android/inputmethod/latin/utils/ExecutorUtils.java b/java/src/com/android/inputmethod/latin/utils/ExecutorUtils.java
index c08697c4b..61da1b789 100644
--- a/java/src/com/android/inputmethod/latin/utils/ExecutorUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/ExecutorUtils.java
@@ -19,23 +19,42 @@ package com.android.inputmethod.latin.utils;
 import com.android.inputmethod.annotations.UsedForTesting;
 
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ThreadFactory;
 
 /**
  * Utilities to manage executors.
  */
 public class ExecutorUtils {
-    private static final ConcurrentHashMap<String, PrioritizedSerialExecutor> sExecutorMap =
+    private static final ConcurrentHashMap<String, ExecutorService> sExecutorMap =
             new ConcurrentHashMap<>();
 
+    private static class ThreadFactoryWithId implements ThreadFactory {
+        private final String mId;
+
+        public ThreadFactoryWithId(final String id) {
+            mId = id;
+        }
+
+        @Override
+        public Thread newThread(final Runnable r) {
+            return new Thread(r, "Executor - " + mId);
+        }
+    }
+
     /**
      * Gets the executor for the given id.
      */
-    public static PrioritizedSerialExecutor getExecutor(final String id) {
-        PrioritizedSerialExecutor executor = sExecutorMap.get(id);
+    public static ExecutorService getExecutor(final String id) {
+        ExecutorService executor = sExecutorMap.get(id);
         if (executor == null) {
             synchronized(sExecutorMap) {
-                executor = new PrioritizedSerialExecutor(id);
-                sExecutorMap.put(id, executor);
+                executor = sExecutorMap.get(id);
+                if (executor == null) {
+                    executor = Executors.newSingleThreadExecutor(new ThreadFactoryWithId(id));
+                    sExecutorMap.put(id, executor);
+                }
             }
         }
         return executor;
@@ -47,7 +66,7 @@ public class ExecutorUtils {
     @UsedForTesting
     public static void shutdownAllExecutors() {
         synchronized(sExecutorMap) {
-            for (final PrioritizedSerialExecutor executor : sExecutorMap.values()) {
+            for (final ExecutorService executor : sExecutorMap.values()) {
                 executor.execute(new Runnable() {
                     @Override
                     public void run() {
diff --git a/java/src/com/android/inputmethod/latin/utils/PrioritizedSerialExecutor.java b/java/src/com/android/inputmethod/latin/utils/PrioritizedSerialExecutor.java
deleted file mode 100644
index 21949ffbd..000000000
--- a/java/src/com/android/inputmethod/latin/utils/PrioritizedSerialExecutor.java
+++ /dev/null
@@ -1,137 +0,0 @@
-/*
- * Copyright (C) 2013 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.inputmethod.latin.utils;
-
-import com.android.inputmethod.annotations.UsedForTesting;
-
-import java.util.Queue;
-import java.util.concurrent.ArrayBlockingQueue;
-import java.util.concurrent.ConcurrentLinkedQueue;
-import java.util.concurrent.ThreadFactory;
-import java.util.concurrent.ThreadPoolExecutor;
-import java.util.concurrent.TimeUnit;
-
-/**
- * An object that executes submitted tasks using a thread.
- */
-public class PrioritizedSerialExecutor {
-    public static final String TAG = PrioritizedSerialExecutor.class.getSimpleName();
-
-    private final Object mLock = new Object();
-
-    private final Queue<Runnable> mTasks;
-    private final Queue<Runnable> mPrioritizedTasks;
-    private boolean mIsShutdown;
-    private final ThreadPoolExecutor mThreadPoolExecutor;
-
-    // The task which is running now.
-    private Runnable mActive;
-
-    private static class ThreadFactoryWithId implements ThreadFactory {
-        private final String mId;
-
-        public ThreadFactoryWithId(final String id) {
-            mId = id;
-        }
-
-        @Override
-        public Thread newThread(final Runnable r) {
-            return new Thread(r, TAG + " - " + mId);
-        }
-    }
-
-    public PrioritizedSerialExecutor(final String id) {
-        mTasks = new ConcurrentLinkedQueue<>();
-        mPrioritizedTasks = new ConcurrentLinkedQueue<>();
-        mIsShutdown = false;
-        mThreadPoolExecutor = new ThreadPoolExecutor(1 /* corePoolSize */, 1 /* maximumPoolSize */,
-                0 /* keepAliveTime */, TimeUnit.MILLISECONDS, new ArrayBlockingQueue<Runnable>(1),
-                new ThreadFactoryWithId(id));
-    }
-
-    /**
-     * Enqueues the given task into the task queue.
-     * @param r the enqueued task
-     */
-    public void execute(final Runnable r) {
-        synchronized(mLock) {
-            if (!mIsShutdown) {
-                mTasks.offer(new Runnable() {
-                    @Override
-                    public void run() {
-                        try {
-                            r.run();
-                        } finally {
-                            scheduleNext();
-                        }
-                    }
-                });
-                if (mActive == null) {
-                    scheduleNext();
-                }
-            }
-        }
-    }
-
-    /**
-     * Enqueues the given task into the prioritized task queue.
-     * @param r the enqueued task
-     */
-    @UsedForTesting
-    public void executePrioritized(final Runnable r) {
-        synchronized(mLock) {
-            if (!mIsShutdown) {
-                mPrioritizedTasks.offer(new Runnable() {
-                    @Override
-                    public void run() {
-                        try {
-                            r.run();
-                        } finally {
-                            scheduleNext();
-                        }
-                    }
-                });
-                if (mActive == null) {
-                    scheduleNext();
-                }
-            }
-        }
-    }
-
-    private boolean fetchNextTasksLocked() {
-        mActive = mPrioritizedTasks.poll();
-        if (mActive == null) {
-            mActive = mTasks.poll();
-        }
-        return mActive != null;
-    }
-
-    private void scheduleNext() {
-        synchronized(mLock) {
-            if (fetchNextTasksLocked()) {
-                mThreadPoolExecutor.execute(mActive);
-            }
-        }
-    }
-
-    public void shutdown() {
-        synchronized(mLock) {
-            mIsShutdown = true;
-            mThreadPoolExecutor.shutdown();
-        }
-    }
-}
diff --git a/tests/src/com/android/inputmethod/latin/utils/ExecutorUtilsTests.java b/tests/src/com/android/inputmethod/latin/utils/ExecutorUtilsTests.java
new file mode 100644
index 000000000..ae2623d12
--- /dev/null
+++ b/tests/src/com/android/inputmethod/latin/utils/ExecutorUtilsTests.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2013 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.inputmethod.latin.utils;
+
+import android.test.AndroidTestCase;
+import android.test.suitebuilder.annotation.MediumTest;
+import android.util.Log;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * Unit tests for ExecutorUtils.
+ */
+@MediumTest
+public class ExecutorUtilsTests extends AndroidTestCase {
+    private static final String TAG = ExecutorUtilsTests.class.getSimpleName();
+
+    private static final String TEST_EXECUTOR_ID = "test";
+    private static final int NUM_OF_TASKS = 10;
+    private static final int DELAY_FOR_WAITING_TASKS_MILLISECONDS = 500;
+
+    public void testExecute() {
+        final ExecutorService executor = ExecutorUtils.getExecutor(TEST_EXECUTOR_ID);
+        final AtomicInteger v = new AtomicInteger(0);
+        for (int i = 0; i < NUM_OF_TASKS; ++i) {
+            executor.execute(new Runnable() {
+                @Override
+                public void run() {
+                    v.incrementAndGet();
+                }
+            });
+        }
+        try {
+            executor.awaitTermination(DELAY_FOR_WAITING_TASKS_MILLISECONDS, TimeUnit.MILLISECONDS);
+        } catch (InterruptedException e) {
+            Log.d(TAG, "Exception while sleeping.", e);
+        }
+
+        assertEquals(NUM_OF_TASKS, v.get());
+    }
+}
diff --git a/tests/src/com/android/inputmethod/latin/utils/PrioritizedSerialExecutorTests.java b/tests/src/com/android/inputmethod/latin/utils/PrioritizedSerialExecutorTests.java
deleted file mode 100644
index 8b78816ce..000000000
--- a/tests/src/com/android/inputmethod/latin/utils/PrioritizedSerialExecutorTests.java
+++ /dev/null
@@ -1,106 +0,0 @@
-/*
- * Copyright (C) 2013 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.inputmethod.latin.utils;
-
-import android.test.AndroidTestCase;
-import android.test.suitebuilder.annotation.MediumTest;
-import android.util.Log;
-
-import java.util.concurrent.atomic.AtomicInteger;
-
-/**
- * Unit tests for PrioritizedSerialExecutor.
- * TODO: Add more detailed tests to make use of priorities, etc.
- */
-@MediumTest
-public class PrioritizedSerialExecutorTests extends AndroidTestCase {
-    private static final String TAG = PrioritizedSerialExecutorTests.class.getSimpleName();
-
-    private static final String TEST_EXECUTOR_ID = "test";
-    private static final int NUM_OF_TASKS = 10;
-    private static final int DELAY_FOR_WAITING_TASKS_MILLISECONDS = 500;
-
-    public void testExecute() {
-        final PrioritizedSerialExecutor executor = new PrioritizedSerialExecutor(TEST_EXECUTOR_ID);
-        final AtomicInteger v = new AtomicInteger(0);
-        for (int i = 0; i < NUM_OF_TASKS; ++i) {
-            executor.execute(new Runnable() {
-                @Override
-                public void run() {
-                    v.incrementAndGet();
-                }
-            });
-        }
-        try {
-            Thread.sleep(DELAY_FOR_WAITING_TASKS_MILLISECONDS);
-        } catch (InterruptedException e) {
-            Log.d(TAG, "Exception while sleeping.", e);
-        }
-
-        assertEquals(NUM_OF_TASKS, v.get());
-    }
-
-    public void testExecutePrioritized() {
-        final PrioritizedSerialExecutor executor = new PrioritizedSerialExecutor(TEST_EXECUTOR_ID);
-        final AtomicInteger v = new AtomicInteger(0);
-        for (int i = 0; i < NUM_OF_TASKS; ++i) {
-            executor.executePrioritized(new Runnable() {
-                @Override
-                public void run() {
-                    v.incrementAndGet();
-                }
-            });
-        }
-        try {
-            Thread.sleep(DELAY_FOR_WAITING_TASKS_MILLISECONDS);
-        } catch (InterruptedException e) {
-            Log.d(TAG, "Exception while sleeping.", e);
-        }
-
-        assertEquals(NUM_OF_TASKS, v.get());
-    }
-
-    public void testExecuteCombined() {
-        final PrioritizedSerialExecutor executor = new PrioritizedSerialExecutor(TEST_EXECUTOR_ID);
-        final AtomicInteger v = new AtomicInteger(0);
-        for (int i = 0; i < NUM_OF_TASKS; ++i) {
-            executor.execute(new Runnable() {
-                @Override
-                public void run() {
-                    v.incrementAndGet();
-                }
-            });
-        }
-
-        for (int i = 0; i < NUM_OF_TASKS; ++i) {
-            executor.executePrioritized(new Runnable() {
-                @Override
-                public void run() {
-                    v.incrementAndGet();
-                }
-            });
-        }
-
-        try {
-            Thread.sleep(DELAY_FOR_WAITING_TASKS_MILLISECONDS);
-        } catch (InterruptedException e) {
-            Log.d(TAG, "Exception while sleeping.", e);
-        }
-
-        assertEquals(2 * NUM_OF_TASKS, v.get());
-    }
-}