broker-plugins/management-http/src/main/java/org/apache/qpid/server/management/plugin/servlet/rest/QueueReportServlet.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.qpid.server.management.plugin.servlet.rest;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.qpid.server.management.plugin.HttpManagementUtil;
import org.apache.qpid.server.management.plugin.report.ReportRunner;
import org.apache.qpid.server.model.Broker;
import org.apache.qpid.server.model.ConfiguredObject;
import org.apache.qpid.server.model.Queue;
import org.apache.qpid.server.model.VirtualHost;

public class QueueReportServlet extends AbstractServlet
{
    private static final long serialVersionUID = 1L;

    @Override
    protected void doGet(HttpServletRequest request,
                         HttpServletResponse response,
                         final ConfiguredObject<?> managedObject)
            throws IOException, ServletException
    {
        List<String> pathInfoElements =
                HttpManagementUtil.getPathInfoElements(request.getServletPath(), request.getPathInfo());
        Queue<?> queue;
        String reportName;
        if (managedObject instanceof Broker && pathInfoElements.size() == 3)
        {
            queue = getQueueFromRequest(pathInfoElements);
            reportName = pathInfoElements.get(2);

        }
        else if(managedObject instanceof VirtualHost && pathInfoElements.size() == 2)
        {
            queue = getQueueFromVirtualHost(pathInfoElements.get(0), (VirtualHost<?>)managedObject);
            reportName = pathInfoElements.get(1);
        }
        else
        {
            queue = null;
            reportName = null;
        }

        if(queue != null)
        {
            ReportRunner<?> reportRunner = ReportRunner.createRunner(reportName,request.getParameterMap());
            Object output = reportRunner.runReport(queue);
            response.setContentType(reportRunner.getContentType());
            if(reportRunner.isBinaryReport())
            {
                response.getOutputStream().write((byte[])output);
            }
            else
            {
                response.getWriter().write((String)output);
            }
        }
        else
        {
            throw new IllegalArgumentException("Invalid path is specified");
        }

    }

    private Queue<?> getQueueFromRequest(final List<String> pathInfoElements)
    {
        if (pathInfoElements.size() < 2)
        {
            throw new IllegalArgumentException("Invalid path is specified");
        }
        String vhostName = pathInfoElements.get(0);
        String queueName = pathInfoElements.get(1);

        VirtualHost<?> vhost = getBroker().findVirtualHostByName(vhostName);
        if (vhost == null)
        {
            throw new IllegalArgumentException("Could not find virtual host with name '" + vhostName + "'");
        }

        Queue queueFromVirtualHost = getQueueFromVirtualHost(queueName, vhost);
        if (queueFromVirtualHost == null)
        {
            throw new IllegalArgumentException("Could not find queue with name '" + queueName  + "' on virtual host '" + vhost.getName() + "'");
        }
        return queueFromVirtualHost;
    }

    private Queue getQueueFromVirtualHost(String queueName, VirtualHost<?> vhost)
    {
        Queue queue = null;

        for(Queue<?> q : vhost.getChildren(Queue.class))
        {

            if(q.getName().equals(queueName))
            {
                queue = q;
                break;
            }
        }
        return queue;
    }

}