org.apache.flink.runtime.dispatcher.SingleJobJobGraphStore Maven / Gradle / Ivy

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/*
 * 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.flink.runtime.dispatcher;

import org.apache.flink.api.common.JobID;
import org.apache.flink.runtime.jobgraph.JobGraph;
import org.apache.flink.runtime.jobmanager.JobGraphStore;
import org.apache.flink.util.FlinkException;
import org.apache.flink.util.Preconditions;

import java.util.Collection;
import java.util.Collections;
import java.util.Objects;

/** {@link JobGraphStore} implementation for a single job. */
public class SingleJobJobGraphStore implements JobGraphStore {

    private final JobGraph jobGraph;

    public SingleJobJobGraphStore(JobGraph jobGraph) {
        this.jobGraph = Preconditions.checkNotNull(jobGraph);
    }

    @Override
    public void start(JobGraphListener jobGraphListener) throws Exception {
        // noop
    }

    @Override
    public void stop() throws Exception {
        // noop
    }

    @Override
    public JobGraph recoverJobGraph(JobID jobId) throws Exception {
        if (jobGraph.getJobID().equals(jobId)) {
            return jobGraph;
        } else {
            throw new FlinkException("Could not recover job graph " + jobId + '.');
        }
    }

    @Override
    public void putJobGraph(JobGraph jobGraph) throws Exception {
        if (!Objects.equals(this.jobGraph.getJobID(), jobGraph.getJobID())) {
            throw new FlinkException(
                    "Cannot put additional jobs into this submitted job graph store.");
        }
    }

    @Override
    public Collection getJobIds() {
        return Collections.singleton(jobGraph.getJobID());
    }
}