FeedReplicationWorkflowBuilder.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.falcon.oozie.feed;

import org.apache.falcon.FalconException;
import org.apache.falcon.Tag;
import org.apache.falcon.entity.EntityUtil;
import org.apache.falcon.entity.store.ConfigurationStore;
import org.apache.falcon.entity.v0.EntityType;
import org.apache.falcon.entity.v0.cluster.Cluster;
import org.apache.falcon.entity.v0.feed.Feed;
import org.apache.falcon.oozie.OozieOrchestrationWorkflowBuilder;
import org.apache.falcon.oozie.workflow.WORKFLOWAPP;
import org.apache.hadoop.fs.Path;

import java.util.Properties;

/**
 * Builds feed replication workflow, one per source-target cluster combination.
 */
public abstract class FeedReplicationWorkflowBuilder extends OozieOrchestrationWorkflowBuilder<Feed> {
    protected static final String REPLICATION_ACTION_TEMPLATE = "/action/feed/replication-action.xml";
    protected static final String REPLICATION_ACTION_NAME = "replication";

    public FeedReplicationWorkflowBuilder(Feed entity) {
        super(entity, Tag.REPLICATION);
    }

    @Override public Properties build(Cluster cluster, Path buildPath) throws FalconException {
        Cluster srcCluster = ConfigurationStore.get().get(EntityType.CLUSTER, buildPath.getName());

        WORKFLOWAPP workflow = getWorkflow(srcCluster, cluster);
        String wfName = EntityUtil.getWorkflowName(Tag.REPLICATION, entity).toString();
        workflow.setName(wfName);

        addLibExtensionsToWorkflow(cluster, workflow, Tag.REPLICATION);

        marshal(cluster, workflow, buildPath);
        Properties props = getProperties(buildPath, wfName);
        props.putAll(getWorkflowProperties());
        return props;
    }

    private Properties getWorkflowProperties() {
        Properties props = new Properties();
        props.setProperty("falconDataOperation", "REPLICATE");
        return props;
    }

    protected abstract WORKFLOWAPP getWorkflow(Cluster src, Cluster target) throws FalconException;
}