| /* |
| * 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.hadoop.chukwa.inputtools.plugin; |
| |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.nio.charset.Charset; |
| |
| import org.json.simple.JSONObject; |
| |
| /** |
| * Runs external command-line tools, captures output. |
| * |
| * Subclasses are responsible for implementing getCmde(), which determines the |
| * command to be invoked. |
| * |
| */ |
| public abstract class ExecPlugin implements IPlugin { |
| public final static int statusOK = 100; |
| public final static int statusKO = -100; |
| |
| Process process = null; |
| |
| public ExecPlugin() { |
| |
| } |
| |
| public void stop() { |
| if(process != null) |
| process.destroy(); |
| } |
| |
| public int waitFor() throws InterruptedException { |
| return process.waitFor(); |
| } |
| |
| public abstract String getCmde(); |
| |
| public JSONObject postProcess(JSONObject execResult) { |
| return execResult; |
| } |
| |
| public JSONObject execute() { |
| JSONObject result = new JSONObject(); |
| try { |
| result.put("timestamp", System.currentTimeMillis()); |
| |
| Runtime runtime = Runtime.getRuntime(); |
| process = runtime.exec(getCmde()); |
| |
| OutputReader stdOut = new OutputReader(process, Output.stdOut); |
| stdOut.start(); |
| OutputReader stdErr = new OutputReader(process, Output.stdErr); |
| stdErr.start(); |
| int exitValue = process.waitFor(); |
| stdOut.join(); |
| stdErr.join(); |
| process.getInputStream().close(); //otherwise this implicitly stays open |
| result.put("exitValue", exitValue); |
| result.put("stdout", stdOut.output.toString()); |
| result.put("stderr", stdErr.output.toString()); |
| result.put("status", statusOK); |
| process.getOutputStream().close(); |
| process.getErrorStream().close(); |
| } catch (Throwable e) { |
| try { |
| result.put("status", statusKO); |
| result.put("errorLog", e.getMessage()); |
| if(e.getMessage().contains("Too many open files")) { |
| //maybe die abruptly? Error is ir-recoverable and runtime can reboot us. |
| // System.exit(1); |
| } |
| } catch (Exception e1) { |
| e1.printStackTrace(); |
| } |
| e.printStackTrace(); |
| } |
| |
| return postProcess(result); |
| } |
| } |
| |
| |
| enum Output { |
| stdOut, stdErr |
| }; |
| |
| |
| class OutputReader extends Thread { |
| private Process process = null; |
| private Output outputType = null; |
| public StringBuilder output = new StringBuilder(); |
| |
| public OutputReader(Process process, Output outputType) { |
| this.process = process; |
| this.outputType = outputType; |
| } |
| |
| public void run() { |
| try { |
| String line = null; |
| InputStream is = null; |
| switch (this.outputType) { |
| case stdOut: |
| is = process.getInputStream(); |
| break; |
| case stdErr: |
| is = process.getErrorStream(); |
| break; |
| |
| } |
| if(is!=null) { |
| InputStreamReader isr = new InputStreamReader(is, Charset.forName("UTF-8")); |
| BufferedReader br = new BufferedReader(isr); |
| while ((line = br.readLine()) != null) { |
| // System.out.println("========>>>>>>>["+line+"]"); |
| output.append(line).append("\n"); |
| } |
| br.close(); |
| } |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } catch (Throwable e) { |
| e.printStackTrace(); |
| } |
| } |
| } |