2 * Copyright 2017-present Open Networking Foundation
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 package io.atomix.utils.concurrent;
18 import java.util.LinkedList;
19 import java.util.concurrent.Executor;
22 * Executor that executes tasks in order on a shared thread pool.
24 * The ordered executor behaves semantically like a single-threaded executor, but multiplexes tasks on a shared thread
25 * pool, ensuring blocked threads in the shared thread pool don't block individual ordered executors.
27 public class OrderedExecutor implements Executor {
28 private final Executor parent;
29 private final LinkedList<Runnable> tasks = new LinkedList<>();
30 private boolean running;
32 public OrderedExecutor(Executor parent) {
39 synchronized (tasks) {
51 public void execute(Runnable command) {
52 synchronized (tasks) {
56 parent.execute(this::run);