org.ambraproject.action.debug.ProcessDumpAction.java Source code

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Here is the source code for org.ambraproject.action.debug.ProcessDumpAction.java

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/*
 * $HeadURL$
 * $Id$
 * Copyright (c) 2006-2012 by Public Library of Science http://plos.org http://ambraproject.org
 * Licensed 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-2.0Unless 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.ambraproject.action.debug;

import org.ambraproject.action.InternalIpAction;
import org.apache.commons.io.IOUtils;
import org.apache.struts2.ServletActionContext;

import java.io.PrintWriter;

/**
 * Action that basically just renders the output of "ps uaxwww".
 */
public class ProcessDumpAction extends InternalIpAction {

    @Override
    public String execute() throws Exception {
        if (!checkAccess()) {
            throw new IllegalAccessException();
        }
        PrintWriter writer = ServletActionContext.getResponse().getWriter();
        String dump = getProcessDump();
        for (String s : dump.split("\n")) {
            writer.println(s);
        }
        return null;
    }

    private String getProcessDump() throws Exception {
        Process process = null;
        String result;
        try {
            process = Runtime.getRuntime().exec("ps uaxwww");
            result = IOUtils.toString(process.getInputStream());
            process.waitFor();
        } finally {
            process.destroy();
        }
        return result;
    }
}