| /* |
| * 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.drill.exec.compile; |
| |
| import java.io.IOException; |
| import java.io.Writer; |
| |
| import org.apache.drill.shaded.guava.com.google.common.base.Preconditions; |
| |
| import org.apache.log4j.Level; |
| import org.slf4j.Logger; |
| |
| /** |
| * A simple Writer that will forward whole lines (lines ending with a newline) to |
| * a Logger. The newlines themselves are not forwarded. |
| */ |
| public class LogWriter extends Writer { |
| private final Logger logger; // the underlying logger to write to |
| private final int level; // the debug level to write at |
| private final StringBuilder stringBuilder; // a buffer for incomplete lines |
| private boolean isClosed; // close() has been called |
| |
| /** |
| * Constructor. |
| * |
| * @param logger the logger this Writer should write to |
| * @param level the debug level to write to the logger with |
| */ |
| public LogWriter(final Logger logger, final Level level) { |
| Preconditions.checkNotNull(logger); |
| Preconditions.checkArgument((level == Level.DEBUG) || (level == Level.ERROR) || |
| (level == Level.INFO) || (level == Level.TRACE) || (level == Level.WARN), |
| "level must be a logging level"); |
| |
| this.logger = logger; |
| this.level = level.toInt(); |
| stringBuilder = new StringBuilder(80); |
| isClosed = false; |
| } |
| |
| @Override |
| public void write(char[] cbuf, int off, int len) throws IOException { |
| checkNotClosed(); |
| |
| stringBuilder.append(cbuf, off, len); |
| |
| // log all of the whole lines we have |
| do { |
| final int newlinePos = stringBuilder.indexOf("\n"); |
| if (newlinePos < 0) { |
| break; |
| } |
| |
| final String oneLine = stringBuilder.substring(0, newlinePos); // leaves out the newline |
| writeToLog(oneLine); |
| stringBuilder.delete(0, newlinePos + 1); // removes the newline as well |
| |
| } while (stringBuilder.length() > 0); |
| } |
| |
| @Override |
| public void flush() throws IOException { |
| checkNotClosed(); |
| flushToLog(); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| checkNotClosed(); |
| isClosed = true; |
| flushToLog(); |
| } |
| |
| /* |
| * Assumes there are no newlines. |
| */ |
| private void flushToLog() { |
| writeToLog(stringBuilder.toString()); |
| stringBuilder.setLength(0); |
| } |
| |
| private void writeToLog(final String s) { |
| if ((s == null) || s.isEmpty()) { |
| return; |
| } |
| |
| switch(level) { |
| case Level.DEBUG_INT: |
| logger.debug(s); |
| break; |
| |
| case Level.ERROR_INT: |
| logger.error(s); |
| break; |
| |
| case Level.INFO_INT: |
| logger.info(s); |
| break; |
| |
| case Level.TRACE_INT: |
| logger.trace(s); |
| break; |
| |
| case Level.WARN_INT: |
| logger.warn(s); |
| break; |
| |
| default: |
| throw new IllegalStateException(); |
| } |
| } |
| |
| private void checkNotClosed() throws IOException { |
| if (isClosed) { |
| throw new IOException("LogWriter is already closed()"); |
| } |
| } |
| } |