001/** 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.apache.oozie.service; 019 020import org.apache.oozie.util.XLogFilter; 021import org.apache.oozie.util.Instrumentable; 022import org.apache.oozie.util.Instrumentation; 023import org.apache.oozie.util.XLogStreamer; 024 025import java.io.IOException; 026import java.io.Writer; 027import java.util.Map; 028import java.util.Date; 029 030/** 031 * Service that performs streaming of log files over Web Services if enabled in XLogService 032 */ 033public class XLogStreamingService implements Service, Instrumentable { 034 private static final String CONF_PREFIX = Service.CONF_PREFIX + "XLogStreamingService."; 035 public static final String STREAM_BUFFER_LEN = CONF_PREFIX + "buffer.len"; 036 037 protected int bufferLen; 038 039 /** 040 * Initialize the log streaming service. 041 * 042 * @param services services instance. 043 * @throws ServiceException thrown if the log streaming service could not be initialized. 044 */ 045 public void init(Services services) throws ServiceException { 046 bufferLen = services.getConf().getInt(STREAM_BUFFER_LEN, 4096); 047 } 048 049 /** 050 * Destroy the log streaming service. 051 */ 052 public void destroy() { 053 } 054 055 /** 056 * Return the public interface for log streaming service. 057 * 058 * @return {@link XLogStreamingService}. 059 */ 060 public Class<? extends Service> getInterface() { 061 return XLogStreamingService.class; 062 } 063 064 /** 065 * Instruments the log streaming service. 066 * 067 * @param instr instrumentation to use. 068 */ 069 public void instrument(Instrumentation instr) { 070 // nothing to instrument 071 } 072 073 /** 074 * Stream the log of a job. 075 * 076 * @param filter log streamer filter. 077 * @param startTime start time for log events to filter. 078 * @param endTime end time for log events to filter. 079 * @param writer writer to stream the log to. 080 * @param params additional parameters from the request 081 * @throws IOException thrown if the log cannot be streamed. 082 */ 083 public void streamLog(XLogFilter filter, Date startTime, Date endTime, Writer writer, Map<String, String[]> params) 084 throws IOException { 085 XLogService xLogService = Services.get().get(XLogService.class); 086 if (xLogService.getLogOverWS()) { 087 new XLogStreamer(filter, xLogService.getOozieLogPath(), xLogService.getOozieLogName(), 088 xLogService.getOozieLogRotation()).streamLog(writer, startTime, endTime, bufferLen); 089 } 090 else { 091 writer.write("Log streaming disabled!!"); 092 } 093 } 094 095 public int getBufferLen() { 096 return bufferLen; 097 } 098}