1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache license, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the license for the specific language governing permissions and
15 * limitations under the license.
16 */
17 package org.apache.logging.log4j.core.layout;
18
19 import java.nio.ByteBuffer;
20
21 /**
22 * Helper class for ByteBufferDestination implementors.
23 *
24 * @since 2.9 (see LOG4J2-1874)
25 */
26 public final class ByteBufferDestinationHelper {
27
28 private ByteBufferDestinationHelper() {
29 }
30
31 /**
32 * Writes the specified data to the specified destination. Doesn't synchronize on the destination object. The helper
33 * method for {@link ByteBufferDestination#writeBytes(ByteBuffer)} implementations.
34 *
35 * @param source the data to write
36 * @param destination the {@code ByteBufferDestination} to write to
37 */
38 public static void writeToUnsynchronized(final ByteBuffer source, final ByteBufferDestination destination) {
39 ByteBuffer destBuff = destination.getByteBuffer();
40 while (source.remaining() > destBuff.remaining()) {
41 final int originalLimit = source.limit();
42 source.limit(Math.min(source.limit(), source.position() + destBuff.remaining()));
43 destBuff.put(source);
44 source.limit(originalLimit);
45 destBuff = destination.drain(destBuff);
46 }
47 destBuff.put(source);
48 // No drain in the end.
49 }
50
51 /**
52 * Writes the specified data to the specified destination. Doesn't synchronize on the destination object. The helper
53 * method for {@link ByteBufferDestination#writeBytes(byte[], int, int)} implementations.
54 *
55 * @param data the data to write
56 * @param offset where to start in the specified data array
57 * @param length the number of bytes to write
58 * @param destination the {@code ByteBufferDestination} to write to
59 */
60 public static void writeToUnsynchronized(final byte[] data, int offset, int length,
61 final ByteBufferDestination destination) {
62 ByteBuffer buffer = destination.getByteBuffer();
63 while (length > buffer.remaining()) {
64 final int chunk = buffer.remaining();
65 buffer.put(data, offset, chunk);
66 offset += chunk;
67 length -= chunk;
68 buffer = destination.drain(buffer);
69 }
70 buffer.put(data, offset, length);
71 // No drain in the end.
72 }
73 }