| /* |
| * Copyright (C) 2020 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; |
| |
| import android.util.Pools; |
| import android.view.SurfaceControl; |
| |
| import javax.inject.Inject; |
| import javax.inject.Singleton; |
| |
| /** |
| * Provides a synchronized pool of {@link SurfaceControl.Transaction}s to minimize allocations. |
| */ |
| @Singleton |
| public class TransactionPool { |
| private final Pools.SynchronizedPool<SurfaceControl.Transaction> mTransactionPool = |
| new Pools.SynchronizedPool<>(4); |
| |
| @Inject |
| TransactionPool() { |
| } |
| |
| /** Gets a transaction from the pool. */ |
| public SurfaceControl.Transaction acquire() { |
| SurfaceControl.Transaction t = mTransactionPool.acquire(); |
| if (t == null) { |
| return new SurfaceControl.Transaction(); |
| } |
| return t; |
| } |
| |
| /** |
| * Return a transaction to the pool. DO NOT call {@link SurfaceControl.Transaction#close()} if |
| * returning to pool. |
| */ |
| public void release(SurfaceControl.Transaction t) { |
| if (!mTransactionPool.release(t)) { |
| t.close(); |
| } |
| } |
| } |