Extract the throttling part from ThrottlingCursorLoader
Extracted into the Throttle class as I'll need this logic elsewhere. Bonus: Now it has tests. Change-Id: Ie9a5933f8e5015dda6985ba76814f1f945266178
This commit is contained in:
Makoto Onuki
parent
14a5d8d947
commit
085f7eb121
179
src/com/android/email/Throttle.java
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179
src/com/android/email/Throttle.java
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@ -0,0 +1,179 @@
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/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.email;
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import android.os.Handler;
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import android.util.Log;
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import java.security.InvalidParameterException;
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import java.util.Timer;
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import java.util.TimerTask;
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/**
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* This class used to "throttle" a flow of events.
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*
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* When {@link #onEvent()} is called, it calls the callback in a certain timeout later.
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* Initially {@link #mMinTimeout} is used as the timeout, but if it gets multiple {@link #onEvent}
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* calls in a certain amount of time, it extends the timeout, until it reaches {@link #mMaxTimeout}.
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*
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* This class is primarily used to throttle content changed events.
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*/
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public class Throttle {
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public static final boolean DEBUG = false; // Don't submit with true
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public static final int DEFAULT_MIN_TIMEOUT = 150;
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public static final int DEFAULT_MAX_TIMEOUT = 2500;
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/* package */ static final int TIMEOUT_EXTEND_INTERVAL = 500;
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private static Timer TIMER = new Timer();
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private final Clock mClock;
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private final Timer mTimer;
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/** Name of the instance. Only for logging. */
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private final String mName;
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/** Handler for UI thread. */
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private final Handler mHandler;
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/** Callback to be called */
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private final Runnable mCallback;
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/** Minimum (default) timeout, in milliseconds. */
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private final int mMinTimeout;
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/** Max timeout, in milliseconds. */
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private final int mMaxTimeout;
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/** Current timeout, in milliseconds. */
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private int mTimeout;
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/** When {@link #onEvent()} was last called. */
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private long mLastEventTime;
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private MyTimerTask mRunningTimerTask;
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/** Constructor with default timeout */
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public Throttle(String name, Runnable callback, Handler handler) {
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this(name, callback, handler, DEFAULT_MIN_TIMEOUT, DEFAULT_MAX_TIMEOUT);
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}
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/** Constructor that takes custom timeout */
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public Throttle(String name, Runnable callback, Handler handler,int minTimeout,
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int maxTimeout) {
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this(name, callback, handler, minTimeout, maxTimeout, Clock.INSTANCE, TIMER);
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}
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/** Constructor for tests */
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/* package */ Throttle(String name, Runnable callback, Handler handler,int minTimeout,
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int maxTimeout, Clock clock, Timer timer) {
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if (maxTimeout < minTimeout) {
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throw new InvalidParameterException();
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}
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mName = name;
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mCallback = callback;
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mClock = clock;
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mTimer = timer;
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mHandler = handler;
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mMinTimeout = minTimeout;
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mMaxTimeout = maxTimeout;
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mTimeout = mMinTimeout;
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}
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private void debugLog(String message) {
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Log.d(Email.LOG_TAG, "Throttle: [" + mName + "] " + message);
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}
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private boolean isCallbackScheduled() {
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return mRunningTimerTask != null;
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}
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public void cancelScheduledCallback() {
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if (mRunningTimerTask != null) {
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if (DEBUG) debugLog("Canceling scheduled callback");
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mRunningTimerTask.cancel();
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mRunningTimerTask = null;
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}
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}
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/* package */ void updateTimeout() {
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final long now = mClock.getTime();
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if ((now - mLastEventTime) <= TIMEOUT_EXTEND_INTERVAL) {
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mTimeout *= 2;
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if (mTimeout >= mMaxTimeout) {
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mTimeout = mMaxTimeout;
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}
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if (DEBUG) debugLog("Timeout extended " + mTimeout);
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} else {
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mTimeout = mMinTimeout;
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if (DEBUG) debugLog("Timeout reset to " + mTimeout);
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}
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mLastEventTime = now;
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}
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public void onEvent() {
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if (DEBUG) debugLog("onEvent");
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updateTimeout();
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if (isCallbackScheduled()) {
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if (DEBUG) debugLog(" callback already scheduled");
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} else {
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if (DEBUG) debugLog(" scheduling callback");
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mRunningTimerTask = new MyTimerTask();
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mTimer.schedule(mRunningTimerTask, mTimeout);
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}
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}
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/**
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* Timer task called on timeout,
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*/
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private class MyTimerTask extends TimerTask {
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private boolean mCanceled;
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@Override
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public void run() {
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mHandler.post(new HandlerRunnable());
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}
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@Override
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public boolean cancel() {
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mCanceled = true;
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return super.cancel();
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}
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private class HandlerRunnable implements Runnable {
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@Override
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public void run() {
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mRunningTimerTask = null;
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if (!mCanceled) { // This check has to be done on the UI thread.
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if (DEBUG) debugLog("Kicking callback");
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mCallback.run();
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}
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}
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}
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}
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/* package */ int getTimeoutForTest() {
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return mTimeout;
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}
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/* package */ long getLastEventTimeForTest() {
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return mLastEventTime;
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}
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}
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@ -16,7 +16,8 @@
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package com.android.email.data;
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import com.android.email.Clock;
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import com.android.email.Email;
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import com.android.email.Throttle;
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import android.content.Context;
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import android.content.CursorLoader;
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@ -24,183 +25,64 @@ import android.net.Uri;
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import android.os.Handler;
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import android.util.Log;
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import java.security.InvalidParameterException;
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import java.util.Timer;
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import java.util.TimerTask;
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/**
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* A {@link CursorLoader} variant that throttle auto-requery on content changes.
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*
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* This class overrides {@link android.content.Loader#onContentChanged}, and instead of immediately
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* requerying, it waits until the specified timeout before doing so.
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*
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* There are two timeout settings: {@link #mMinTimeout} and {@link #mMaxTimeout}.
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* We normally use {@link #mMinTimeout}, but if we detect more than one change in
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* the {@link #TIMEOUT_EXTEND_INTERVAL} period, we double it, until it reaches {@link #mMaxTimeout}.
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* A {@link CursorLoader} variant that throttle auto-requery on content changes using
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* {@link Throttle}.
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*/
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public class ThrottlingCursorLoader extends CursorLoader {
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private static final boolean DEBUG = false; // Don't submit with true
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/* package */ static final int TIMEOUT_EXTEND_INTERVAL = 500;
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private static final int DEFAULT_MIN_TIMEOUT = 150;
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private static final int DEFAULT_MAX_TIMEOUT = 2500;
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private static Timer sTimer = new Timer();
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private final Clock mClock;
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/** Handler for the UI thread. */
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private final Handler mHandler = new Handler();
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/** Minimum (default) timeout */
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private final int mMinTimeout;
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/** Max timeout */
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private final int mMaxTimeout;
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/** Content change auto-requery timeout, in milliseconds. */
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private int mTimeout;
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/** When onChanged() was last called. */
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private long mLastOnChangedTime;
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private ForceLoadTimerTask mRunningForceLoadTimerTask;
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private final Throttle mThrottle;
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/** Constructor with default timeout */
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public ThrottlingCursorLoader(Context context, Uri uri, String[] projection, String selection,
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String[] selectionArgs, String sortOrder) {
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this(context, uri, projection, selection, selectionArgs, sortOrder, DEFAULT_MIN_TIMEOUT,
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DEFAULT_MAX_TIMEOUT);
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this(context, uri, projection, selection, selectionArgs, sortOrder,
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Throttle.DEFAULT_MIN_TIMEOUT, Throttle.DEFAULT_MAX_TIMEOUT);
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}
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/** Constructor that takes custom timeout */
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public ThrottlingCursorLoader(Context context, Uri uri, String[] projection, String selection,
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String[] selectionArgs, String sortOrder, int minTimeout, int maxTimeout) {
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this(context, uri, projection, selection, selectionArgs, sortOrder, minTimeout, maxTimeout,
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Clock.INSTANCE);
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}
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/** Constructor for tests. Clock is injectable. */
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/* package */ ThrottlingCursorLoader(Context context, Uri uri, String[] projection,
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String selection, String[] selectionArgs, String sortOrder,
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int minTimeout, int maxTimeout, Clock clock) {
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super(context, uri, projection, selection, selectionArgs, sortOrder);
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mClock = clock;
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if (maxTimeout < minTimeout) {
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throw new InvalidParameterException();
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Runnable forceLoadRunnable = new Runnable() {
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@Override
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public void run() {
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forceLoad();
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}
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mMinTimeout = minTimeout;
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mMaxTimeout = maxTimeout;
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mTimeout = mMinTimeout;
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};
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mThrottle = new Throttle(uri.toString(), forceLoadRunnable, new Handler(),
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minTimeout, maxTimeout);
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}
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private void debugLog(String message) {
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Log.d("ThrottlingCursorLoader", "[" + getUri() + "] " + message);
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}
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/**
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* @return true if forceLoad() is scheduled.
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*/
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private boolean isForceLoadScheduled() {
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return mRunningForceLoadTimerTask != null;
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}
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/**
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* Cancel the scheduled forceLoad(), if exists.
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*/
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private void cancelScheduledForceLoad() {
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if (DEBUG) debugLog("cancelScheduledForceLoad");
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if (mRunningForceLoadTimerTask != null) {
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mRunningForceLoadTimerTask.cancel();
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mRunningForceLoadTimerTask = null;
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}
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Log.d(Email.LOG_TAG, "ThrottlingCursorLoader: [" + getUri() + "] " + message);
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}
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@Override
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public void startLoading() {
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if (DEBUG) debugLog("startLoading");
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cancelScheduledForceLoad();
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if (Throttle.DEBUG) debugLog("startLoading");
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mThrottle.cancelScheduledCallback();
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super.startLoading();
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}
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@Override
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public void forceLoad() {
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if (DEBUG) debugLog("forceLoad");
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cancelScheduledForceLoad();
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if (Throttle.DEBUG) debugLog("forceLoad");
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mThrottle.cancelScheduledCallback();
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super.forceLoad();
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}
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@Override
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public void stopLoading() {
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if (DEBUG) debugLog("stopLoading");
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cancelScheduledForceLoad();
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if (Throttle.DEBUG) debugLog("stopLoading");
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mThrottle.cancelScheduledCallback();
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super.stopLoading();
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}
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/* package */ void updateTimeout() {
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final long now = mClock.getTime();
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if ((now - mLastOnChangedTime) <= TIMEOUT_EXTEND_INTERVAL) {
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if (DEBUG) debugLog("Extending timeout: " + mTimeout);
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mTimeout *= 2;
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if (mTimeout >= mMaxTimeout) {
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mTimeout = mMaxTimeout;
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}
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} else {
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if (DEBUG) debugLog("Resetting timeout.");
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mTimeout = mMinTimeout;
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}
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mLastOnChangedTime = now;
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}
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@Override
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public void onContentChanged() {
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if (DEBUG) debugLog("onContentChanged");
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if (Throttle.DEBUG) debugLog("onContentChanged");
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updateTimeout();
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if (isForceLoadScheduled()) {
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if (DEBUG) debugLog(" forceLoad already scheduled.");
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} else {
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if (DEBUG) debugLog(" scheduling forceLoad.");
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mRunningForceLoadTimerTask = new ForceLoadTimerTask();
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sTimer.schedule(mRunningForceLoadTimerTask, mTimeout);
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}
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}
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/**
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* A {@link TimerTask} to call {@link #forceLoad} on the UI thread.
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*/
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private class ForceLoadTimerTask extends TimerTask {
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private boolean mCanceled;
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@Override
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public void run() {
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mHandler.post(new ForceLoadRunnable());
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}
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@Override
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public boolean cancel() {
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mCanceled = true;
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return super.cancel();
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}
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private class ForceLoadRunnable implements Runnable {
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@Override
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public void run() {
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if (!mCanceled) { // This check has to be done on the UI thread.
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forceLoad();
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}
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}
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}
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}
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/* package */ int getTimeoutForTest() {
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return mTimeout;
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}
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/* package */ long getLastOnChangedTimeForTest() {
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return mLastOnChangedTime;
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mThrottle.onEvent();
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}
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}
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207
tests/src/com/android/email/ThrottleTest.java
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207
tests/src/com/android/email/ThrottleTest.java
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@ -0,0 +1,207 @@
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/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.email;
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import android.os.Handler;
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import android.os.Message;
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import android.test.AndroidTestCase;
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import java.util.Timer;
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import java.util.TimerTask;
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import java.util.concurrent.BlockingQueue;
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import java.util.concurrent.LinkedBlockingQueue;
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public class ThrottleTest extends AndroidTestCase {
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private static final int MIN_TIMEOUT = 100;
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private static final int MAX_TIMEOUT = 500;
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private final CountingRunnable mRunnable = new CountingRunnable();
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private final MockClock mClock = new MockClock();
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private final MockTimer mTimer = new MockTimer(mClock);
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private final Throttle mTarget = new Throttle("test", mRunnable, new CallItNowHandler(),
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MIN_TIMEOUT, MAX_TIMEOUT, mClock, mTimer);
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/**
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* Advance the clock.
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*/
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private void advanceClock(int milliseconds) {
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mClock.advance(milliseconds);
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mTimer.runExpiredTasks();
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}
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/**
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* Gets two events. They're far apart enough that the timeout won't be extended.
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*/
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public void testSingleCalls() {
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// T + 0
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mTarget.onEvent();
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advanceClock(0);
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assertEquals(0, mRunnable.mCounter);
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// T + 99
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advanceClock(99);
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assertEquals(0, mRunnable.mCounter); // Still not called
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// T + 100
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advanceClock(1);
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assertEquals(1, mRunnable.mCounter); // Called
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// T + 10100
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advanceClock(10000);
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assertEquals(1, mRunnable.mCounter);
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// Do the same thing again. Should work in the same way.
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// T + 0
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mTarget.onEvent();
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advanceClock(0);
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assertEquals(1, mRunnable.mCounter);
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// T + 99
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advanceClock(99);
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assertEquals(1, mRunnable.mCounter); // Still not called
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// T + 100
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advanceClock(1);
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assertEquals(2, mRunnable.mCounter); // Called
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// T + 10100
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advanceClock(10000);
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assertEquals(2, mRunnable.mCounter);
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}
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/**
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* Gets 5 events in a row in a short period.
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*
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* We only roughly check the consequence, as the detailed spec isn't really important.
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* Here, we check if the timeout is extended, and the callback get called less than
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* 5 times.
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*/
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public void testMultiCalls() {
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mTarget.onEvent();
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advanceClock(1);
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mTarget.onEvent();
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advanceClock(1);
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mTarget.onEvent();
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advanceClock(1);
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mTarget.onEvent();
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advanceClock(1);
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mTarget.onEvent();
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// Timeout should be extended
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assertTrue(mTarget.getTimeoutForTest() > 100);
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// Shouldn't result in 5 callback calls.
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advanceClock(2000);
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assertTrue(mRunnable.mCounter < 5);
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}
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public void testUpdateTimeout() {
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// Check initial value
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assertEquals(100, mTarget.getTimeoutForTest());
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// First call -- won't change the timeout
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mTarget.updateTimeout();
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assertEquals(100, mTarget.getTimeoutForTest());
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||||
// Call again in 10 ms -- will extend timeout.
|
||||
mClock.advance(10);
|
||||
mTarget.updateTimeout();
|
||||
assertEquals(200, mTarget.getTimeoutForTest());
|
||||
|
||||
// Call again in TIMEOUT_EXTEND_INTERAVL ms -- will extend timeout.
|
||||
mClock.advance(Throttle.TIMEOUT_EXTEND_INTERVAL);
|
||||
mTarget.updateTimeout();
|
||||
assertEquals(400, mTarget.getTimeoutForTest());
|
||||
|
||||
// Again -- timeout reaches max.
|
||||
mClock.advance(Throttle.TIMEOUT_EXTEND_INTERVAL);
|
||||
mTarget.updateTimeout();
|
||||
assertEquals(500, mTarget.getTimeoutForTest());
|
||||
|
||||
// Call in TIMEOUT_EXTEND_INTERAVL + 1 ms -- timeout will get reset.
|
||||
mClock.advance(Throttle.TIMEOUT_EXTEND_INTERVAL + 1);
|
||||
mTarget.updateTimeout();
|
||||
assertEquals(100, mTarget.getTimeoutForTest());
|
||||
}
|
||||
|
||||
private static class CountingRunnable implements Runnable {
|
||||
public int mCounter;
|
||||
|
||||
@Override
|
||||
public void run() {
|
||||
mCounter++;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Dummy {@link Handler} that executes {@link Runnable}s passed to {@link Handler#post}
|
||||
* immediately on the current thread.
|
||||
*/
|
||||
private static class CallItNowHandler extends Handler {
|
||||
@Override
|
||||
public boolean sendMessageAtTime(Message msg, long uptimeMillis) {
|
||||
msg.getCallback().run();
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Substitute for {@link Timer} that works based on the provided {@link Clock}.
|
||||
*/
|
||||
private static class MockTimer extends Timer {
|
||||
private final Clock mClock;
|
||||
|
||||
private static class Entry {
|
||||
public long mScheduledTime;
|
||||
public TimerTask mTask;
|
||||
}
|
||||
|
||||
private final BlockingQueue<Entry> mTasks = new LinkedBlockingQueue<Entry>();
|
||||
|
||||
public MockTimer(Clock clock) {
|
||||
mClock = clock;
|
||||
}
|
||||
|
||||
@Override
|
||||
public void schedule(TimerTask task, long delay) {
|
||||
if (delay == 0) {
|
||||
task.run();
|
||||
} else {
|
||||
Entry e = new Entry();
|
||||
e.mScheduledTime = mClock.getTime() + delay;
|
||||
e.mTask = task;
|
||||
mTasks.offer(e);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* {@link MockTimer} can't know when the clock advances. This method must be called
|
||||
* whenever the (mock) current time changes.
|
||||
*/
|
||||
public void runExpiredTasks() {
|
||||
while (!mTasks.isEmpty()) {
|
||||
Entry e = mTasks.peek();
|
||||
if (e.mScheduledTime > mClock.getTime()) {
|
||||
break;
|
||||
}
|
||||
e.mTask.run();
|
||||
mTasks.poll();
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -1,57 +0,0 @@
|
||||
/*
|
||||
* Copyright (C) 2010 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.email.data;
|
||||
|
||||
import com.android.email.MockClock;
|
||||
|
||||
import android.test.AndroidTestCase;
|
||||
|
||||
public class ThrottlingCursorLoaderTest extends AndroidTestCase {
|
||||
|
||||
public void testUpdateTimeout() {
|
||||
MockClock clock = new MockClock();
|
||||
ThrottlingCursorLoader l = new ThrottlingCursorLoader(getContext(), null, null, null, null,
|
||||
null, 100, 500, clock);
|
||||
|
||||
// Check initial value
|
||||
assertEquals(100, l.getTimeoutForTest());
|
||||
|
||||
// First call -- won't change the timeout
|
||||
l.updateTimeout();
|
||||
assertEquals(100, l.getTimeoutForTest());
|
||||
|
||||
// Call again in 10 ms -- will extend timeout.
|
||||
clock.advance(10);
|
||||
l.updateTimeout();
|
||||
assertEquals(200, l.getTimeoutForTest());
|
||||
|
||||
// Call again in TIMEOUT_EXTEND_INTERAVL ms -- will extend timeout.
|
||||
clock.advance(ThrottlingCursorLoader.TIMEOUT_EXTEND_INTERVAL);
|
||||
l.updateTimeout();
|
||||
assertEquals(400, l.getTimeoutForTest());
|
||||
|
||||
// Again -- timeout reaches max.
|
||||
clock.advance(ThrottlingCursorLoader.TIMEOUT_EXTEND_INTERVAL);
|
||||
l.updateTimeout();
|
||||
assertEquals(500, l.getTimeoutForTest());
|
||||
|
||||
// Call in TIMEOUT_EXTEND_INTERAVL + 1 ms -- timeout will get reset.
|
||||
clock.advance(ThrottlingCursorLoader.TIMEOUT_EXTEND_INTERVAL + 1);
|
||||
l.updateTimeout();
|
||||
assertEquals(100, l.getTimeoutForTest());
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user