com.vlkan.log4j2.logstash.layout.util.ByteBufferDestinations Maven / Gradle / Ivy

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/*
 * Copyright 2017-2020 Volkan Yazıcı
 *
 * Licensed 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 permits and
 * limitations under the License.
 */

package com.vlkan.log4j2.logstash.layout.util;

import org.apache.logging.log4j.core.layout.ByteBufferDestination;

import java.nio.ByteBuffer;

public enum ByteBufferDestinations {;

    /**
     * Back ported from {@link org.apache.logging.log4j.core.layout.ByteBufferDestinationHelper} introduced in 2.9.
     */
    public static void writeToUnsynchronized(ByteBuffer source, ByteBufferDestination destination) {
        ByteBuffer destBuff = destination.getByteBuffer();
        while (source.remaining() > destBuff.remaining()) {
            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.
    }

}