org.apache.logging.log4j.core.layout.ByteBufferDestinationHelper Maven / Gradle / Ivy
/*
* 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.logging.log4j.core.layout;
import java.nio.ByteBuffer;
/**
* Helper class for ByteBufferDestination implementors.
*
* @since 2.9 (see LOG4J2-1874)
*/
public final class ByteBufferDestinationHelper {
private ByteBufferDestinationHelper() {}
/**
* Writes the specified data to the specified destination. Doesn't synchronize on the destination object. The helper
* method for {@link ByteBufferDestination#writeBytes(ByteBuffer)} implementations.
*
* @param source the data to write
* @param destination the {@code ByteBufferDestination} to write to
*/
public static void writeToUnsynchronized(final ByteBuffer source, final ByteBufferDestination destination) {
ByteBuffer destBuff = destination.getByteBuffer();
while (source.remaining() > destBuff.remaining()) {
final int originalLimit = source.limit();
source.limit(Math.min(source.limit(), source.position() + destBuff.remaining()));
destBuff.put(source);
source.limit(originalLimit);
destBuff = destination.drain(destBuff);
}
destBuff.put(source);
// No drain in the end.
}
/**
* Writes the specified data to the specified destination. Doesn't synchronize on the destination object. The helper
* method for {@link ByteBufferDestination#writeBytes(byte[], int, int)} implementations.
*
* @param data the data to write
* @param offset where to start in the specified data array
* @param length the number of bytes to write
* @param destination the {@code ByteBufferDestination} to write to
*/
public static void writeToUnsynchronized(
final byte[] data, final int offset, final int length, final ByteBufferDestination destination) {
ByteBuffer buffer = destination.getByteBuffer();
int currentOffset = offset;
int currentLength = length;
while (currentLength > buffer.remaining()) {
final int chunk = buffer.remaining();
buffer.put(data, currentOffset, chunk);
currentOffset += chunk;
currentLength -= chunk;
buffer = destination.drain(buffer);
}
buffer.put(data, currentOffset, currentLength);
// No drain in the end.
}
}