org.apache.activemq.artemis.core.persistence.impl.journal.BufferSplitter 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.activemq.artemis.core.persistence.impl.journal;
import java.util.function.Consumer;
import org.apache.activemq.artemis.api.core.ActiveMQBuffer;
import org.apache.activemq.artemis.core.journal.EncodingSupport;
/** this class will split a big buffer into smaller buffers */
public class BufferSplitter {
public static void split(ActiveMQBuffer buffer, int splitSize, Consumer target) {
byte[] bytesBuffer = new byte[buffer.readableBytes()];
buffer.readBytes(bytesBuffer);
split(bytesBuffer, splitSize, target);
}
public static void split(byte[] buffer, int splitSize, Consumer target) {
int location = 0;
while (location < buffer.length) {
int maxSize = Math.min(splitSize, buffer.length - location);
target.accept(new PartialEncoding(buffer, location, maxSize));
location += maxSize;
}
}
protected static class PartialEncoding implements EncodingSupport {
final byte[] data;
final int begin;
final int length;
public PartialEncoding(final byte[] data, final int begin, final int length) {
this.data = data;
this.begin = begin;
this.length = length;
}
// Public --------------------------------------------------------
@Override
public void decode(final ActiveMQBuffer buffer) {
throw new IllegalStateException("operation not supported");
}
@Override
public void encode(final ActiveMQBuffer buffer) {
buffer.writeBytes(data, begin, length);
}
@Override
public int getEncodeSize() {
return length;
}
}
}