001/*
002 * (C) Copyright 2017 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     bdelbosc
018 */
019package org.nuxeo.ecm.platform.importer.mqueues.workmanager;
020
021import org.nuxeo.ecm.core.work.api.Work;
022import org.nuxeo.ecm.platform.importer.mqueues.computation.AbstractComputation;
023import org.nuxeo.ecm.platform.importer.mqueues.computation.ComputationContext;
024import org.nuxeo.ecm.platform.importer.mqueues.computation.Record;
025
026import java.io.ByteArrayInputStream;
027import java.io.ByteArrayOutputStream;
028import java.io.IOException;
029import java.io.ObjectInput;
030import java.io.ObjectInputStream;
031import java.io.ObjectOutput;
032import java.io.ObjectOutputStream;
033
034
035/**
036 * @since 9.2
037 */
038public class ComputationWork extends AbstractComputation {
039    public ComputationWork(String name) {
040        super(name, 1, 0);
041    }
042
043    @Override
044    public void processRecord(ComputationContext context, String inputStreamName, Record record) {
045        Work work = deserialize(record.data);
046        try {
047            work.run();
048        } finally {
049            // TODO catch error and propagate
050            work.cleanUp(true, null);
051        }
052        context.askForCheckpoint();
053    }
054
055    @Override
056    public void init(ComputationContext context) {
057        super.init(context);
058        try {
059            // TODO: check if NXP-21969 provide a way to start computation only once framework is started
060            // until then wait to prevent conflict during startup
061            Thread.sleep(10000);
062        } catch (InterruptedException e) {
063            Thread.interrupted();
064            throw new RuntimeException(e);
065        }
066    }
067
068    public static Work deserialize(byte[] data) {
069        ByteArrayInputStream bis = new ByteArrayInputStream(data);
070        ObjectInput in = null;
071        try {
072            in = new ObjectInputStream(bis);
073            return (Work) in.readObject();
074        } catch (IOException | ClassNotFoundException e) {
075            System.out.println("Error " + e.getMessage());
076            throw new RuntimeException(e);
077        } finally {
078            try {
079                if (in != null) {
080                    in.close();
081                }
082            } catch (IOException ex) {
083                // ignore close exception
084            }
085        }
086    }
087
088    public static byte[] serialize(Work work) {
089        ByteArrayOutputStream bos = new ByteArrayOutputStream();
090        ObjectOutput out;
091        try {
092            out = new ObjectOutputStream(bos);
093            out.writeObject(work);
094            out.flush();
095            return bos.toByteArray();
096        } catch (IOException e) {
097            System.out.println("Error " + e.getMessage());
098            throw new RuntimeException(e);
099        } finally {
100            try {
101                bos.close();
102            } catch (IOException ex) {
103                // ignore close exception
104            }
105        }
106    }
107}