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 java.nio.ByteBuffer; 020 021/** 022 * Helper class for ByteBufferDestination implementors. 023 * 024 * @since 2.9 (see LOG4J2-1874) 025 */ 026public final class ByteBufferDestinationHelper { 027 028 private ByteBufferDestinationHelper() { 029 } 030 031 /** 032 * Writes the specified data to the specified destination. Doesn't synchronize on the destination object. The helper 033 * method for {@link ByteBufferDestination#writeBytes(ByteBuffer)} implementations. 034 * 035 * @param source the data to write 036 * @param destination the {@code ByteBufferDestination} to write to 037 */ 038 public static void writeToUnsynchronized(final ByteBuffer source, final ByteBufferDestination destination) { 039 ByteBuffer destBuff = destination.getByteBuffer(); 040 while (source.remaining() > destBuff.remaining()) { 041 final int originalLimit = source.limit(); 042 source.limit(Math.min(source.limit(), source.position() + destBuff.remaining())); 043 destBuff.put(source); 044 source.limit(originalLimit); 045 destBuff = destination.drain(destBuff); 046 } 047 destBuff.put(source); 048 // No drain in the end. 049 } 050 051 /** 052 * Writes the specified data to the specified destination. Doesn't synchronize on the destination object. The helper 053 * method for {@link ByteBufferDestination#writeBytes(byte[], int, int)} implementations. 054 * 055 * @param data the data to write 056 * @param offset where to start in the specified data array 057 * @param length the number of bytes to write 058 * @param destination the {@code ByteBufferDestination} to write to 059 */ 060 public static void writeToUnsynchronized(final byte[] data, int offset, int length, 061 final ByteBufferDestination destination) { 062 ByteBuffer buffer = destination.getByteBuffer(); 063 while (length > buffer.remaining()) { 064 final int chunk = buffer.remaining(); 065 buffer.put(data, offset, chunk); 066 offset += chunk; 067 length -= chunk; 068 buffer = destination.drain(buffer); 069 } 070 buffer.put(data, offset, length); 071 // No drain in the end. 072 } 073}