| /** |
| * 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.sqoop.util; |
| |
| import java.io.BufferedReader; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.io.IOException; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| /** |
| * An AsyncSink that takes the contents of a stream and writes |
| * it to log4j. |
| */ |
| public class LoggingAsyncSink extends AsyncSink { |
| |
| public static final Log LOG = LogFactory.getLog(LoggingAsyncSink.class.getName()); |
| |
| private Log contextLog; |
| |
| public LoggingAsyncSink(final Log context) { |
| if (null == context) { |
| this.contextLog = LOG; |
| } else { |
| this.contextLog = context; |
| } |
| } |
| |
| private Thread child; |
| |
| public void processStream(InputStream is) { |
| child = new LoggingThread(is); |
| child.start(); |
| } |
| |
| public int join() throws InterruptedException { |
| child.join(); |
| return 0; // always successful. |
| } |
| |
| /** |
| * Run a background thread that copies the contents of the stream |
| * to the output context log. |
| */ |
| private class LoggingThread extends Thread { |
| |
| private InputStream stream; |
| |
| LoggingThread(final InputStream is) { |
| this.stream = is; |
| } |
| |
| public void run() { |
| InputStreamReader isr = new InputStreamReader(this.stream); |
| BufferedReader r = new BufferedReader(isr); |
| |
| try { |
| while (true) { |
| String line = r.readLine(); |
| if (null == line) { |
| break; // stream was closed by remote end. |
| } |
| |
| LoggingAsyncSink.this.contextLog.info(line); |
| } |
| } catch (IOException ioe) { |
| LOG.error("IOException reading from stream: " + ioe.toString()); |
| } |
| |
| try { |
| r.close(); |
| } catch (IOException ioe) { |
| LOG.warn("Error closing stream in LoggingAsyncSink: " + ioe.toString()); |
| } |
| } |
| } |
| } |
| |