| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.iotdb.confignode.procedure.scheduler; |
| |
| import org.apache.iotdb.confignode.procedure.Procedure; |
| |
| import java.util.ArrayDeque; |
| |
| /** Simple scheduler for procedures */ |
| public class SimpleProcedureScheduler extends AbstractProcedureScheduler { |
| private final ArrayDeque<Procedure> runnables = new ArrayDeque<>(); |
| private final ArrayDeque<Procedure> waitings = new ArrayDeque<>(); |
| |
| @Override |
| protected void enqueue(final Procedure procedure, final boolean addFront) { |
| if (addFront) { |
| runnables.addFirst(procedure); |
| } else { |
| runnables.addLast(procedure); |
| } |
| } |
| |
| @Override |
| protected Procedure dequeue() { |
| return runnables.poll(); |
| } |
| |
| @Override |
| public void clear() { |
| schedLock(); |
| try { |
| runnables.clear(); |
| } finally { |
| schedUnlock(); |
| } |
| } |
| |
| @Override |
| public void yield(final Procedure proc) { |
| addBack(proc); |
| } |
| |
| @Override |
| public boolean queueHasRunnables() { |
| return runnables.size() > 0; |
| } |
| |
| @Override |
| public int queueSize() { |
| return runnables.size(); |
| } |
| |
| public void addWaiting(Procedure proc) { |
| waitings.add(proc); |
| } |
| |
| public void releaseWaiting() { |
| runnables.addAll(waitings); |
| waitings.clear(); |
| } |
| } |