| /* |
| * Copyright (C) 2019 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.systemui.util.concurrency; |
| |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * Implementation of {@link RepeatableExecutor} for SystemUI. |
| */ |
| class RepeatableExecutorImpl implements RepeatableExecutor { |
| |
| private final DelayableExecutor mExecutor; |
| |
| RepeatableExecutorImpl(DelayableExecutor executor) { |
| mExecutor = executor; |
| } |
| |
| @Override |
| public void execute(Runnable command) { |
| mExecutor.execute(command); |
| } |
| |
| @Override |
| public Runnable executeRepeatedly(Runnable r, long initDelay, long delay, TimeUnit unit) { |
| ExecutionToken token = new ExecutionToken(r, delay, unit); |
| token.start(initDelay, unit); |
| return token::cancel; |
| } |
| |
| private class ExecutionToken implements Runnable { |
| private final Runnable mCommand; |
| private final long mDelay; |
| private final TimeUnit mUnit; |
| private final Object mLock = new Object(); |
| private Runnable mCancel; |
| |
| ExecutionToken(Runnable r, long delay, TimeUnit unit) { |
| mCommand = r; |
| mDelay = delay; |
| mUnit = unit; |
| } |
| |
| @Override |
| public void run() { |
| mCommand.run(); |
| synchronized (mLock) { |
| if (mCancel != null) { |
| mCancel = mExecutor.executeDelayed(this, mDelay, mUnit); |
| } |
| } |
| } |
| |
| /** Starts execution that will repeat the command until {@link cancel}. */ |
| public void start(long startDelay, TimeUnit unit) { |
| synchronized (mLock) { |
| mCancel = mExecutor.executeDelayed(this, startDelay, unit); |
| } |
| } |
| |
| /** Cancel repeated execution of command. */ |
| public void cancel() { |
| synchronized (mLock) { |
| if (mCancel != null) { |
| mCancel.run(); |
| mCancel = null; |
| } |
| } |
| } |
| } |
| } |