elastic-job-cloud-scheduler/src/main/java/org/apache/shardingsphere/elasticjob/cloud/scheduler/ha/FrameworkIDService.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.shardingsphere.elasticjob.cloud.scheduler.ha;

import org.apache.shardingsphere.elasticjob.cloud.reg.base.CoordinatorRegistryCenter;
import com.google.common.base.Optional;
import com.google.common.base.Strings;
import lombok.RequiredArgsConstructor;

/**
 * FrameworkID service.
 */
@RequiredArgsConstructor
public final class FrameworkIDService {
    
    private final CoordinatorRegistryCenter regCenter;
    
    /**
     * Fetch FrameworkID.
     * 
     * @return the optional value of FrameworkID
     */
    public Optional<String> fetch() {
        String frameworkId = regCenter.getDirectly(HANode.FRAMEWORK_ID_NODE);
        return Strings.isNullOrEmpty(frameworkId) ? Optional.<String>absent() : Optional.of(frameworkId);
    }
    
    /**
     * Save FrameworkID.
     * 
     * @param id framework id
     */
    public void save(final String id) {
        if (!regCenter.isExisted(HANode.FRAMEWORK_ID_NODE)) {
            regCenter.persist(HANode.FRAMEWORK_ID_NODE, id);
        }
    }
}