engine/src/main/java/org/apache/sling/bgservlets/impl/servlets/JobStreamServlet.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.sling.bgservlets.impl.servlets;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.jcr.Node;
import javax.jcr.RepositoryException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletResponse;

import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Property;
import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.Service;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.servlets.SlingSafeMethodsServlet;
import org.apache.sling.bgservlets.BackgroundServletConstants;
import org.apache.sling.bgservlets.JobData;
import org.apache.sling.bgservlets.JobStorage;

/** Default rendering of the job's stream node: replays the
 *  stored stream.    
 */
@Component
@Service
@SuppressWarnings("serial")
@Property(name = "sling.servlet.resourceTypes", value = BackgroundServletConstants.STREAM_RESOURCE_TYPE)
public class JobStreamServlet extends SlingSafeMethodsServlet {

    @Reference
    private JobStorage jobStorage;
    
    @Override
    protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) 
    throws ServletException, IOException {
        final Node n = request.getResource().adaptTo(Node.class);
        if(n == null) {
            response.sendError(HttpServletResponse.SC_NOT_FOUND, 
                    "Resource does not adapt to a Node: " + request.getResource().getPath());
        }

        // The stream is a child of the job node
        try {
            final JobData d = jobStorage.getJobData(n.getParent()); 
            final InputStream is = d.getInputStream();
            try {
                response.setContentType(request.getResponseContentType());
                final OutputStream os = response.getOutputStream();
                final byte [] buffer = new byte[32768];
                int count = 0;
                while((count = is.read(buffer, 0, buffer.length)) > 0) {
                    os.write(buffer, 0, count);
                }
                os.flush();
            } finally {
                if(is != null) {
                    is.close();
                }
            }
        } catch(RepositoryException re) {
            throw new ServletException("RepositoryException in doGet()", re);
        }
    }
}