com.jbrisbin.vpc.jobsched.exe.ExeMessageHandler.java Source code

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Here is the source code for com.jbrisbin.vpc.jobsched.exe.ExeMessageHandler.java

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/*
 * Copyright 2010 by J. Brisbin <jon@jbrisbin.com>
 *
 * 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-2.0
 *
 * 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 com.jbrisbin.vpc.jobsched.exe;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

import java.io.BufferedInputStream;
import java.io.File;
import java.util.List;

/**
 * @author Jon Brisbin <jon@jbrisbin.com>
 */
public class ExeMessageHandler implements ApplicationContextAware {

    private Logger log = LoggerFactory.getLogger(getClass());
    private ApplicationContext appCtx;

    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.appCtx = applicationContext;
    }

    public ExeMessage handleMessage(final ExeMessage msg) throws Exception {
        log.debug("handling message: " + msg.toString());

        List<String> args = msg.getArgs();
        args.add(0, msg.getExe());

        try {
            ProcessBuilder pb = new ProcessBuilder(args);
            pb.environment().putAll(msg.getEnv());
            pb.directory(new File(msg.getDir()));
            pb.redirectErrorStream(true);
            Process p = pb.start();

            BufferedInputStream stdout = new BufferedInputStream(p.getInputStream());
            byte[] buff = new byte[4096];
            for (int bytesRead = 0; bytesRead > -1; bytesRead = stdout.read(buff)) {
                msg.getOut().write(buff, 0, bytesRead);
            }

            p.waitFor();
        } catch (Throwable t) {
            log.error(t.getMessage(), t);
            Object errmsg = t.getMessage();
            if (null != errmsg) {
                msg.getOut().write(((String) errmsg).getBytes());
            }
        }
        return msg;
    }
}