AriaLyy
8 years ago
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58afab572c
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0d3c157f38
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/* |
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* Copyright (c) 2014 Badoo Trading Limited |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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* |
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* Portions of documentation in this code are modifications based on work created and |
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* shared by Android Open Source Project and used according to terms described in the |
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* Apache License, Version 2.0 |
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*/ |
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package com.arialyy.aria.util; |
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import android.os.Handler; |
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import android.os.Looper; |
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import android.os.Message; |
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import android.support.annotation.NonNull; |
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import android.support.annotation.Nullable; |
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import android.support.annotation.VisibleForTesting; |
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import java.lang.ref.WeakReference; |
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import java.util.concurrent.locks.Lock; |
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import java.util.concurrent.locks.ReentrantLock; |
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/** |
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* Memory safer implementation of android.os.Handler |
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* <p/> |
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* Original implementation of Handlers always keeps hard reference to handler in queue of execution. |
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* If you create anonymous handler and post delayed message into it, it will keep all parent class
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* for that time in memory even if it could be cleaned. |
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* <p/> |
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* This implementation is trickier, it will keep WeakReferences to runnables and messages, |
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* and GC could collect them once WeakHandler instance is not referenced any more |
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* <p/> |
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* |
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* @see android.os.Handler |
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* |
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* Created by Dmytro Voronkevych on 17/06/2014. |
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*/ |
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@SuppressWarnings("unused") |
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public class WeakHandler { |
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private final Handler.Callback mCallback; // hard reference to Callback. We need to keep callback in memory
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private final ExecHandler mExec; |
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private Lock mLock = new ReentrantLock(); |
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@SuppressWarnings("ConstantConditions") |
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@VisibleForTesting |
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final ChainedRef mRunnables = new ChainedRef(mLock, null); |
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/** |
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* Default constructor associates this handler with the {@link Looper} for the |
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* current thread. |
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* |
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* If this thread does not have a looper, this handler won't be able to receive messages |
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* so an exception is thrown. |
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*/ |
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public WeakHandler() { |
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mCallback = null; |
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mExec = new ExecHandler(); |
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} |
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/** |
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* Constructor associates this handler with the {@link Looper} for the |
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* current thread and takes a callback interface in which you can handle |
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* messages. |
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* |
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* If this thread does not have a looper, this handler won't be able to receive messages |
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* so an exception is thrown. |
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* |
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* @param callback The callback interface in which to handle messages, or null. |
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*/ |
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public WeakHandler(@Nullable Handler.Callback callback) { |
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mCallback = callback; // Hard referencing body
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mExec = new ExecHandler(new WeakReference<>(callback)); // Weak referencing inside ExecHandler
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} |
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/** |
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* Use the provided {@link Looper} instead of the default one. |
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* |
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* @param looper The looper, must not be null. |
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*/ |
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public WeakHandler(@NonNull Looper looper) { |
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mCallback = null; |
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mExec = new ExecHandler(looper); |
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} |
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/** |
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* Use the provided {@link Looper} instead of the default one and take a callback |
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* interface in which to handle messages. |
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* |
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* @param looper The looper, must not be null. |
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* @param callback The callback interface in which to handle messages, or null. |
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*/ |
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public WeakHandler(@NonNull Looper looper, @NonNull Handler.Callback callback) { |
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mCallback = callback; |
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mExec = new ExecHandler(looper, new WeakReference<>(callback)); |
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} |
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/** |
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* Causes the Runnable r to be added to the message queue. |
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* The runnable will be run on the thread to which this handler is |
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* attached. |
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* |
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* @param r The Runnable that will be executed. |
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* |
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* @return Returns true if the Runnable was successfully placed in to the |
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* message queue. Returns false on failure, usually because the |
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* looper processing the message queue is exiting. |
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*/ |
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public final boolean post(@NonNull Runnable r) { |
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return mExec.post(wrapRunnable(r)); |
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} |
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/** |
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* Causes the Runnable r to be added to the message queue, to be run |
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* at a specific time given by <var>uptimeMillis</var>. |
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* <b>The time-base is {@link android.os.SystemClock#uptimeMillis}.</b> |
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* The runnable will be run on the thread to which this handler is attached. |
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* |
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* @param r The Runnable that will be executed. |
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* @param uptimeMillis The absolute time at which the callback should run, |
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* using the {@link android.os.SystemClock#uptimeMillis} time-base. |
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* |
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* @return Returns true if the Runnable was successfully placed in to the |
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* message queue. Returns false on failure, usually because the |
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* looper processing the message queue is exiting. Note that a |
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* result of true does not mean the Runnable will be processed -- if |
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* the looper is quit before the delivery time of the message |
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* occurs then the message will be dropped. |
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*/ |
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public final boolean postAtTime(@NonNull Runnable r, long uptimeMillis) { |
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return mExec.postAtTime(wrapRunnable(r), uptimeMillis); |
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} |
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/** |
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* Causes the Runnable r to be added to the message queue, to be run |
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* at a specific time given by <var>uptimeMillis</var>. |
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* <b>The time-base is {@link android.os.SystemClock#uptimeMillis}.</b> |
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* The runnable will be run on the thread to which this handler is attached. |
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* |
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* @param r The Runnable that will be executed. |
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* @param uptimeMillis The absolute time at which the callback should run, |
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* using the {@link android.os.SystemClock#uptimeMillis} time-base. |
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* |
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* @return Returns true if the Runnable was successfully placed in to the |
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* message queue. Returns false on failure, usually because the |
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* looper processing the message queue is exiting. Note that a |
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* result of true does not mean the Runnable will be processed -- if |
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* the looper is quit before the delivery time of the message |
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* occurs then the message will be dropped. |
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* |
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* @see android.os.SystemClock#uptimeMillis |
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*/ |
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public final boolean postAtTime(Runnable r, Object token, long uptimeMillis) { |
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return mExec.postAtTime(wrapRunnable(r), token, uptimeMillis); |
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} |
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/** |
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* Causes the Runnable r to be added to the message queue, to be run |
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* after the specified amount of time elapses. |
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* The runnable will be run on the thread to which this handler |
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* is attached. |
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* |
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* @param r The Runnable that will be executed. |
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* @param delayMillis The delay (in milliseconds) until the Runnable |
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* will be executed. |
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* |
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* @return Returns true if the Runnable was successfully placed in to the |
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* message queue. Returns false on failure, usually because the |
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* looper processing the message queue is exiting. Note that a |
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* result of true does not mean the Runnable will be processed -- |
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* if the looper is quit before the delivery time of the message |
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* occurs then the message will be dropped. |
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*/ |
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public final boolean postDelayed(Runnable r, long delayMillis) { |
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return mExec.postDelayed(wrapRunnable(r), delayMillis); |
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} |
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/** |
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* Posts a message to an object that implements Runnable. |
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* Causes the Runnable r to executed on the next iteration through the |
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* message queue. The runnable will be run on the thread to which this |
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* handler is attached. |
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* <b>This method is only for use in very special circumstances -- it |
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* can easily starve the message queue, cause ordering problems, or have |
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* other unexpected side-effects.</b> |
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* |
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* @param r The Runnable that will be executed. |
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* |
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* @return Returns true if the message was successfully placed in to the |
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* message queue. Returns false on failure, usually because the |
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* looper processing the message queue is exiting. |
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*/ |
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public final boolean postAtFrontOfQueue(Runnable r) { |
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return mExec.postAtFrontOfQueue(wrapRunnable(r)); |
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} |
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/** |
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* Remove any pending posts of Runnable r that are in the message queue. |
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*/ |
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public final void removeCallbacks(Runnable r) { |
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final WeakRunnable runnable = mRunnables.remove(r); |
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if (runnable != null) { |
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mExec.removeCallbacks(runnable); |
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} |
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} |
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/** |
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* Remove any pending posts of Runnable <var>r</var> with Object |
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* <var>token</var> that are in the message queue. If <var>token</var> is null, |
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* all callbacks will be removed. |
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*/ |
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public final void removeCallbacks(Runnable r, Object token) { |
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final WeakRunnable runnable = mRunnables.remove(r); |
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if (runnable != null) { |
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mExec.removeCallbacks(runnable, token); |
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} |
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} |
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/** |
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* Pushes a message onto the end of the message queue after all pending messages |
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* before the current time. It will be received in callback, |
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* in the thread attached to this handler. |
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* |
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* @return Returns true if the message was successfully placed in to the |
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* message queue. Returns false on failure, usually because the |
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* looper processing the message queue is exiting. |
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*/ |
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public final boolean sendMessage(Message msg) { |
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return mExec.sendMessage(msg); |
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} |
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/** |
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* Sends a Message containing only the what value. |
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* |
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* @return Returns true if the message was successfully placed in to the |
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* message queue. Returns false on failure, usually because the |
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* looper processing the message queue is exiting. |
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*/ |
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public final boolean sendEmptyMessage(int what) { |
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return mExec.sendEmptyMessage(what); |
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} |
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/** |
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* Sends a Message containing only the what value, to be delivered |
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* after the specified amount of time elapses. |
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* @see #sendMessageDelayed(android.os.Message, long) |
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* |
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* @return Returns true if the message was successfully placed in to the |
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* message queue. Returns false on failure, usually because the |
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* looper processing the message queue is exiting. |
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*/ |
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public final boolean sendEmptyMessageDelayed(int what, long delayMillis) { |
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return mExec.sendEmptyMessageDelayed(what, delayMillis); |
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} |
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/** |
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* Sends a Message containing only the what value, to be delivered |
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* at a specific time. |
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* @see #sendMessageAtTime(android.os.Message, long) |
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* |
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* @return Returns true if the message was successfully placed in to the |
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* message queue. Returns false on failure, usually because the |
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* looper processing the message queue is exiting. |
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*/ |
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public final boolean sendEmptyMessageAtTime(int what, long uptimeMillis) { |
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return mExec.sendEmptyMessageAtTime(what, uptimeMillis); |
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} |
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/** |
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* Enqueue a message into the message queue after all pending messages |
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* before (current time + delayMillis). You will receive it in |
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* callback, in the thread attached to this handler. |
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* |
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* @return Returns true if the message was successfully placed in to the |
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* message queue. Returns false on failure, usually because the |
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* looper processing the message queue is exiting. Note that a |
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* result of true does not mean the message will be processed -- if |
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* the looper is quit before the delivery time of the message |
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* occurs then the message will be dropped. |
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*/ |
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public final boolean sendMessageDelayed(Message msg, long delayMillis) { |
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return mExec.sendMessageDelayed(msg, delayMillis); |
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} |
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/** |
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* Enqueue a message into the message queue after all pending messages |
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* before the absolute time (in milliseconds) <var>uptimeMillis</var>. |
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* <b>The time-base is {@link android.os.SystemClock#uptimeMillis}.</b> |
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* You will receive it in callback, in the thread attached |
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* to this handler. |
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* |
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* @param uptimeMillis The absolute time at which the message should be |
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* delivered, using the |
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* {@link android.os.SystemClock#uptimeMillis} time-base. |
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* |
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* @return Returns true if the message was successfully placed in to the |
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* message queue. Returns false on failure, usually because the |
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* looper processing the message queue is exiting. Note that a |
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* result of true does not mean the message will be processed -- if |
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* the looper is quit before the delivery time of the message |
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* occurs then the message will be dropped. |
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*/ |
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public boolean sendMessageAtTime(Message msg, long uptimeMillis) { |
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return mExec.sendMessageAtTime(msg, uptimeMillis); |
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} |
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/** |
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* Enqueue a message at the front of the message queue, to be processed on |
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* the next iteration of the message loop. You will receive it in |
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* callback, in the thread attached to this handler. |
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* <b>This method is only for use in very special circumstances -- it |
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* can easily starve the message queue, cause ordering problems, or have |
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* other unexpected side-effects.</b> |
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* |
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* @return Returns true if the message was successfully placed in to the |
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* message queue. Returns false on failure, usually because the |
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* looper processing the message queue is exiting. |
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*/ |
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public final boolean sendMessageAtFrontOfQueue(Message msg) { |
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return mExec.sendMessageAtFrontOfQueue(msg); |
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} |
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/** |
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* Remove any pending posts of messages with code 'what' that are in the |
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* message queue. |
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*/ |
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public final void removeMessages(int what) { |
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mExec.removeMessages(what); |
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} |
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/** |
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* Remove any pending posts of messages with code 'what' and whose obj is |
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* 'object' that are in the message queue. If <var>object</var> is null, |
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* all messages will be removed. |
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*/ |
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public final void removeMessages(int what, Object object) { |
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mExec.removeMessages(what, object); |
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} |
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/** |
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* Remove any pending posts of callbacks and sent messages whose |
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* <var>obj</var> is <var>token</var>. If <var>token</var> is null, |
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* all callbacks and messages will be removed. |
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*/ |
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public final void removeCallbacksAndMessages(Object token) { |
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mExec.removeCallbacksAndMessages(token); |
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} |
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/** |
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* Check if there are any pending posts of messages with code 'what' in |
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* the message queue. |
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*/ |
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public final boolean hasMessages(int what) { |
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return mExec.hasMessages(what); |
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} |
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/** |
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* Check if there are any pending posts of messages with code 'what' and |
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* whose obj is 'object' in the message queue. |
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*/ |
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public final boolean hasMessages(int what, Object object) { |
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return mExec.hasMessages(what, object); |
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} |
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public final Looper getLooper() { |
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return mExec.getLooper(); |
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} |
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private WeakRunnable wrapRunnable(@NonNull Runnable r) { |
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//noinspection ConstantConditions
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if (r == null) { |
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throw new NullPointerException("Runnable can't be null"); |
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} |
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final ChainedRef hardRef = new ChainedRef(mLock, r); |
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mRunnables.insertAfter(hardRef); |
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return hardRef.wrapper; |
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} |
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private static class ExecHandler extends Handler { |
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private final WeakReference<Handler.Callback> mCallback; |
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ExecHandler() { |
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mCallback = null; |
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} |
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ExecHandler(WeakReference<Handler.Callback> callback) { |
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mCallback = callback; |
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} |
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ExecHandler(Looper looper) { |
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super(looper); |
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mCallback = null; |
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} |
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ExecHandler(Looper looper, WeakReference<Handler.Callback> callback) { |
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super(looper); |
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mCallback = callback; |
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} |
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@Override |
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public void handleMessage(@NonNull Message msg) { |
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if (mCallback == null) { |
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return; |
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} |
||||||
|
final Handler.Callback callback = mCallback.get(); |
||||||
|
if (callback == null) { // Already disposed
|
||||||
|
return; |
||||||
|
} |
||||||
|
callback.handleMessage(msg); |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
static class WeakRunnable implements Runnable { |
||||||
|
private final WeakReference<Runnable> mDelegate; |
||||||
|
private final WeakReference<ChainedRef> mReference; |
||||||
|
|
||||||
|
WeakRunnable(WeakReference<Runnable> delegate, WeakReference<ChainedRef> reference) { |
||||||
|
mDelegate = delegate; |
||||||
|
mReference = reference; |
||||||
|
} |
||||||
|
|
||||||
|
@Override |
||||||
|
public void run() { |
||||||
|
final Runnable delegate = mDelegate.get(); |
||||||
|
final ChainedRef reference = mReference.get(); |
||||||
|
if (reference != null) { |
||||||
|
reference.remove(); |
||||||
|
} |
||||||
|
if (delegate != null) { |
||||||
|
delegate.run(); |
||||||
|
} |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
static class ChainedRef { |
||||||
|
@Nullable |
||||||
|
ChainedRef next; |
||||||
|
@Nullable |
||||||
|
ChainedRef prev; |
||||||
|
@NonNull |
||||||
|
final Runnable runnable; |
||||||
|
@NonNull |
||||||
|
final WeakRunnable wrapper; |
||||||
|
|
||||||
|
@NonNull |
||||||
|
Lock lock; |
||||||
|
|
||||||
|
public ChainedRef(@NonNull Lock lock, @NonNull Runnable r) { |
||||||
|
this.runnable = r; |
||||||
|
this.lock = lock; |
||||||
|
this.wrapper = new WeakRunnable(new WeakReference<>(r), new WeakReference<>(this)); |
||||||
|
} |
||||||
|
|
||||||
|
public WeakRunnable remove() { |
||||||
|
lock.lock(); |
||||||
|
try { |
||||||
|
if (prev != null) { |
||||||
|
prev.next = next; |
||||||
|
} |
||||||
|
if (next != null) { |
||||||
|
next.prev = prev; |
||||||
|
} |
||||||
|
prev = null; |
||||||
|
next = null; |
||||||
|
} finally { |
||||||
|
lock.unlock(); |
||||||
|
} |
||||||
|
return wrapper; |
||||||
|
} |
||||||
|
|
||||||
|
public void insertAfter(@NonNull ChainedRef candidate) { |
||||||
|
lock.lock(); |
||||||
|
try { |
||||||
|
if (this.next != null) { |
||||||
|
this.next.prev = candidate; |
||||||
|
} |
||||||
|
|
||||||
|
candidate.next = this.next; |
||||||
|
this.next = candidate; |
||||||
|
candidate.prev = this; |
||||||
|
} finally { |
||||||
|
lock.unlock(); |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
@Nullable |
||||||
|
public WeakRunnable remove(Runnable obj) { |
||||||
|
lock.lock(); |
||||||
|
try { |
||||||
|
ChainedRef curr = this.next; // Skipping head
|
||||||
|
while (curr != null) { |
||||||
|
if (curr.runnable == obj) { // We do comparison exactly how Handler does inside
|
||||||
|
return curr.remove(); |
||||||
|
} |
||||||
|
curr = curr.next; |
||||||
|
} |
||||||
|
} finally { |
||||||
|
lock.unlock(); |
||||||
|
} |
||||||
|
return null; |
||||||
|
} |
||||||
|
} |
||||||
|
} |
||||||
Loading…
Reference in new issue