org.apache.helix.task.TaskStateModelFactory.java Source code

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Here is the source code for org.apache.helix.task.TaskStateModelFactory.java

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package org.apache.helix.task;

/*
 * 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.
 */

import java.util.Deque;
import java.util.Map;

import org.apache.helix.HelixManager;
import org.apache.helix.api.StateTransitionHandlerFactory;
import org.apache.helix.api.id.PartitionId;
import org.apache.helix.api.id.ResourceId;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;

/**
 * Factory class for {@link TaskStateModel}.
 */
public class TaskStateModelFactory extends StateTransitionHandlerFactory<TaskStateModel> {

    private final HelixManager _manager;
    private final Map<String, TaskFactory> _taskFactoryRegistry;
    private final Deque<TaskStateModel> _taskStateModels;

    public TaskStateModelFactory(HelixManager manager, Map<String, TaskFactory> taskFactoryRegistry) {
        _manager = manager;
        _taskFactoryRegistry = ImmutableMap.copyOf(taskFactoryRegistry);
        _taskStateModels = Lists.newLinkedList();
    }

    @Override
    public TaskStateModel createStateTransitionHandler(ResourceId resourceId, PartitionId partitionId) {
        final TaskStateModel taskStateModel = new TaskStateModel(_manager, _taskFactoryRegistry);
        _taskStateModels.push(taskStateModel);
        return taskStateModel;
    }

    /**
     * Shutdown this {@link TaskStateModelFactory} instance.
     *
     * <p>
     *   This method shuts down all of the {@link TaskStateModel} instances created by this
     *   {@link TaskStateModelFactory} instance.
     * </p>
     */
    public void shutdown() {
        while (!_taskStateModels.isEmpty()) {
            TaskStateModel taskStateModel = _taskStateModels.pop();
            taskStateModel.shutdown();
        }
    }
}