cn.wjybxx.btree.branch.join.JoinSequence Maven / Gradle / Ivy
/*
* Copyright 2024 wjybxx([email protected])
*
* 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 cn.wjybxx.btree.branch.join;
import cn.wjybxx.btree.Task;
import cn.wjybxx.btree.branch.Join;
import cn.wjybxx.btree.branch.JoinPolicy;
import cn.wjybxx.btree.branch.Sequence;
/**
* {@link Sequence}
* 相当于并发编程中的WhenAll/AllOf
*
* @author wjybxx
* date - 2023/12/2
*/
public class JoinSequence implements JoinPolicy {
private static final JoinSequence INSTANCE = new JoinSequence<>();
@SuppressWarnings("unchecked")
public static JoinSequence getInstance() {
return (JoinSequence) INSTANCE;
}
@Override
public void resetForRestart() {
}
@Override
public void beforeEnter(Join join) {
}
@Override
public void enter(Join join) {
if (join.getChildCount() == 0) {
join.setSuccess();
}
}
@Override
public void onChildCompleted(Join join, Task child) {
if (!child.isSucceeded()) {
join.setCompleted(child.getStatus(), true);
} else if (join.isAllChildSucceeded()) {
join.setSuccess();
}
}
@Override
public void onEvent(Join join, Object event) {
}
}