/* * Copyright 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 androidx.room; import androidx.annotation.NonNull; import java.util.ArrayDeque; import java.util.concurrent.Executor; /** * Executor wrapper for performing database transactions serially. *
* Since database transactions are exclusive, this executor ensures that transactions are performed
* in-order and one at a time, preventing threads from blocking each other when multiple concurrent
* transactions are attempted.
*/
class TransactionExecutor implements Executor {
private final Executor mExecutor;
private final ArrayDeque