TaskResultReader.java

/*
 * ProActive Parallel Suite(TM):
 * The Open Source library for parallel and distributed
 * Workflows & Scheduling, Orchestration, Cloud Automation
 * and Big Data Analysis on Enterprise Grids & Clouds.
 *
 * Copyright (c) 2007 - 2017 ActiveEon
 * Contact: contact@activeeon.com
 *
 * This library is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License
 * as published by the Free Software Foundation: version 3 of
 * the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 *
 * If needed, contact us to obtain a release under GPL Version 2 or 3
 * or a different license than the AGPL.
 */
package org.ow2.proactive.scheduler.rest.readers;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import javax.ws.rs.Consumes;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.Provider;

import com.google.common.io.CharStreams;
import com.google.common.io.Closer;


/**
 * Reads the task result as a string which is returned by the 'GET
 * jobs/{jobid}/tasks/{taskname}/result/value' server call.
 */
@Provider
@Consumes(MediaType.APPLICATION_OCTET_STREAM)
public class TaskResultReader implements MessageBodyReader<Serializable> {

    @Override
    public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return MediaType.APPLICATION_OCTET_STREAM_TYPE.equals(mediaType) && Serializable.class.isAssignableFrom(type);
    }

    @Override
    public Serializable readFrom(Class<Serializable> type, Type genericType, Annotation[] annotations,
            MediaType mediaType, MultivaluedMap<String, String> httpHeaders, InputStream entityStream)
            throws IOException, WebApplicationException {
        Closer closer = Closer.create();
        try {
            entityStream = closer.register(entityStream);
            return CharStreams.toString(new InputStreamReader(entityStream));
        } catch (IOException ioe) {
            throw closer.rethrow(ioe);
        } finally {
            closer.close();
        }
    }
}