io.aeron.logbuffer.TermRebuilder Maven / Gradle / Ivy
Show all versions of aeron-client Show documentation
/*
* Copyright 2014-2021 Real Logic Limited.
*
* 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
*
* https://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 io.aeron.logbuffer;
import org.agrona.concurrent.UnsafeBuffer;
import static io.aeron.protocol.DataHeaderFlyweight.HEADER_LENGTH;
/**
* Rebuild a term buffer from received frames which can be out-of-order. The resulting data structure will only
* monotonically increase in state.
*/
public class TermRebuilder
{
/**
* Insert a packet of frames into the log at the appropriate termOffset as indicated by the term termOffset header.
*
* If the packet has already been inserted then this is a noop.
*
* @param termBuffer into which the packet should be inserted.
* @param termOffset in the term at which the packet should be inserted.
* @param packet containing a sequence of frames.
* @param length of the packet of frames in bytes.
*/
public static void insert(
final UnsafeBuffer termBuffer, final int termOffset, final UnsafeBuffer packet, final int length)
{
if (0 == termBuffer.getInt(termOffset))
{
termBuffer.putBytes(termOffset + HEADER_LENGTH, packet, HEADER_LENGTH, length - HEADER_LENGTH);
termBuffer.putLong(termOffset + 24, packet.getLong(24));
termBuffer.putLong(termOffset + 16, packet.getLong(16));
termBuffer.putLong(termOffset + 8, packet.getLong(8));
termBuffer.putLongOrdered(termOffset, packet.getLong(0));
}
}
}