kafka TaskAndAction 源码
kafka TaskAndAction 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/processor/internals/TaskAndAction.java
/*
* 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.kafka.streams.processor.internals;
import org.apache.kafka.streams.processor.TaskId;
import java.util.Objects;
public class TaskAndAction {
enum Action {
ADD,
REMOVE
}
private final Task task;
private final TaskId taskId;
private final Action action;
private TaskAndAction(final Task task, final TaskId taskId, final Action action) {
this.task = task;
this.taskId = taskId;
this.action = action;
}
public static TaskAndAction createAddTask(final Task task) {
Objects.requireNonNull(task, "Task to add is null!");
return new TaskAndAction(task, null, Action.ADD);
}
public static TaskAndAction createRemoveTask(final TaskId taskId) {
Objects.requireNonNull(taskId, "Task ID of task to remove is null!");
return new TaskAndAction(null, taskId, Action.REMOVE);
}
public Task getTask() {
if (action != Action.ADD) {
throw new IllegalStateException("Action type " + action + " cannot have a task!");
}
return task;
}
public TaskId getTaskId() {
if (action != Action.REMOVE) {
throw new IllegalStateException("Action type " + action + " cannot have a task ID!");
}
return taskId;
}
public Action getAction() {
return action;
}
}
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