org.apache.gobblin.cluster.ScheduledJobConfigurationManager.java Source code

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Here is the source code for org.apache.gobblin.cluster.ScheduledJobConfigurationManager.java

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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.gobblin.cluster;

import java.lang.reflect.InvocationTargetException;
import java.net.URI;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

import org.apache.commons.lang3.reflect.ConstructorUtils;
import org.apache.commons.lang3.tuple.Pair;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Optional;
import com.google.common.collect.Maps;
import com.google.common.eventbus.EventBus;
import com.typesafe.config.Config;

import org.apache.gobblin.annotation.Alpha;
import org.apache.gobblin.runtime.api.JobSpec;
import org.apache.gobblin.runtime.api.Spec;
import org.apache.gobblin.runtime.api.SpecConsumer;
import org.apache.gobblin.runtime.api.SpecExecutor;
import org.apache.gobblin.util.ClassAliasResolver;
import org.apache.gobblin.util.ConfigUtils;
import org.apache.gobblin.util.ExecutorsUtils;

@Alpha
public class ScheduledJobConfigurationManager extends JobConfigurationManager {
    private static final Logger LOGGER = LoggerFactory.getLogger(ScheduledJobConfigurationManager.class);

    private static final long DEFAULT_JOB_SPEC_REFRESH_INTERVAL = 60;

    private Map<URI, JobSpec> jobSpecs;

    private final long refreshIntervalInSeconds;

    private final ScheduledExecutorService fetchJobSpecExecutor;

    private final SpecConsumer _specConsumer;

    private final ClassAliasResolver<SpecConsumer> aliasResolver;

    public ScheduledJobConfigurationManager(EventBus eventBus, Config config) {
        super(eventBus, config);

        this.jobSpecs = Maps.newHashMap();
        this.refreshIntervalInSeconds = ConfigUtils.getLong(config,
                GobblinClusterConfigurationKeys.JOB_SPEC_REFRESH_INTERVAL, DEFAULT_JOB_SPEC_REFRESH_INTERVAL);

        this.fetchJobSpecExecutor = Executors.newSingleThreadScheduledExecutor(
                ExecutorsUtils.newThreadFactory(Optional.of(LOGGER), Optional.of("FetchJobSpecExecutor")));

        this.aliasResolver = new ClassAliasResolver<>(SpecConsumer.class);
        try {
            String specConsumerClassName = GobblinClusterConfigurationKeys.DEFAULT_SPEC_CONSUMER_CLASS;
            if (config.hasPath(GobblinClusterConfigurationKeys.SPEC_CONSUMER_CLASS_KEY)) {
                specConsumerClassName = config.getString(GobblinClusterConfigurationKeys.SPEC_CONSUMER_CLASS_KEY);
            }
            LOGGER.info("Using SpecConsumer ClassNameclass name/alias " + specConsumerClassName);
            this._specConsumer = (SpecConsumer) ConstructorUtils
                    .invokeConstructor(Class.forName(this.aliasResolver.resolve(specConsumerClassName)), config);
        } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException | InstantiationException
                | ClassNotFoundException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    protected void startUp() throws Exception {
        LOGGER.info("Starting the " + ScheduledJobConfigurationManager.class.getSimpleName());

        LOGGER.info(String.format("Scheduling the job spec refresh task with an interval of %d second(s)",
                this.refreshIntervalInSeconds));

        // Schedule the job config fetch task
        this.fetchJobSpecExecutor.scheduleAtFixedRate(new Runnable() {
            @Override
            public void run() {
                try {
                    fetchJobSpecs();
                } catch (InterruptedException | ExecutionException e) {
                    LOGGER.error("Failed to fetch job specs", e);
                    throw new RuntimeException("Failed to fetch specs", e);
                }
            }
        }, 0, this.refreshIntervalInSeconds, TimeUnit.SECONDS);
    }

    /***
     * TODO: Change cluster code to handle Spec. Right now all job properties are needed to be in config and template is not honored
     * TODO: Materialized JobSpec and make use of ResolvedJobSpec
     * @throws ExecutionException
     * @throws InterruptedException
     */
    private void fetchJobSpecs() throws ExecutionException, InterruptedException {
        List<Pair<SpecExecutor.Verb, Spec>> changesSpecs = (List<Pair<SpecExecutor.Verb, Spec>>) this._specConsumer
                .changedSpecs().get();

        for (Pair<SpecExecutor.Verb, Spec> entry : changesSpecs) {

            SpecExecutor.Verb verb = entry.getKey();
            if (verb.equals(SpecExecutor.Verb.ADD)) {

                // Handle addition
                JobSpec jobSpec = (JobSpec) entry.getValue();
                postNewJobConfigArrival(jobSpec.getUri().toString(), jobSpec.getConfigAsProperties());
                jobSpecs.put(entry.getValue().getUri(), (JobSpec) entry.getValue());
            } else if (verb.equals(SpecExecutor.Verb.UPDATE)) {

                // Handle update
                JobSpec jobSpec = (JobSpec) entry.getValue();
                postUpdateJobConfigArrival(jobSpec.getUri().toString(), jobSpec.getConfigAsProperties());
                jobSpecs.put(entry.getValue().getUri(), (JobSpec) entry.getValue());
            } else if (verb.equals(SpecExecutor.Verb.DELETE)) {

                // Handle delete
                Spec anonymousSpec = (Spec) entry.getValue();
                postDeleteJobConfigArrival(anonymousSpec.getUri().toString(), new Properties());
                jobSpecs.remove(entry.getValue().getUri());
            }
        }
    }

    @Override
    protected void shutDown() throws Exception {
        ExecutorsUtils.shutdownExecutorService(this.fetchJobSpecExecutor, Optional.of(LOGGER));
    }
}