001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache license, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the license for the specific language governing permissions and 015 * limitations under the license. 016 */ 017package org.apache.logging.log4j.core.layout; 018 019import org.apache.logging.log4j.core.util.Constants; 020import org.apache.logging.log4j.status.StatusLogger; 021 022import java.nio.CharBuffer; 023import java.nio.charset.Charset; 024import java.nio.charset.CharsetEncoder; 025import java.nio.charset.CodingErrorAction; 026import java.util.Objects; 027 028/** 029 * Encoder for StringBuilders that locks on the ByteBufferDestination. 030 */ 031public class LockingStringBuilderEncoder implements Encoder<StringBuilder> { 032 033 private final Charset charset; 034 private final CharsetEncoder charsetEncoder; 035 private final CharBuffer cachedCharBuffer; 036 037 public LockingStringBuilderEncoder(final Charset charset) { 038 this(charset, Constants.ENCODER_CHAR_BUFFER_SIZE); 039 } 040 041 public LockingStringBuilderEncoder(final Charset charset, final int charBufferSize) { 042 this.charset = Objects.requireNonNull(charset, "charset"); 043 this.charsetEncoder = charset.newEncoder().onMalformedInput(CodingErrorAction.REPLACE) 044 .onUnmappableCharacter(CodingErrorAction.REPLACE); 045 this.cachedCharBuffer = CharBuffer.wrap(new char[charBufferSize]); 046 } 047 048 private CharBuffer getCharBuffer() { 049 return cachedCharBuffer; 050 } 051 052 @Override 053 public void encode(final StringBuilder source, final ByteBufferDestination destination) { 054 try { 055 // This synchronized is needed to be able to call destination.getByteBuffer() 056 synchronized (destination) { 057 TextEncoderHelper.encodeText(charsetEncoder, cachedCharBuffer, destination.getByteBuffer(), source, 058 destination); 059 } 060 } catch (final Exception ex) { 061 logEncodeTextException(ex, source, destination); 062 TextEncoderHelper.encodeTextFallBack(charset, source, destination); 063 } 064 065 } 066 067 private void logEncodeTextException(final Exception ex, final StringBuilder text, 068 final ByteBufferDestination destination) { 069 StatusLogger.getLogger().error("Recovering from LockingStringBuilderEncoder.encode('{}') error", text, ex); 070 } 071}