github.com/lirm/aeron-go@v0.0.0-20230415210743-920325491dc4/aeron/ringbuffer/recorddesc.go (about)

     1  /*
     2  Copyright 2016 Stanislav Liberman
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8  http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package rb
    18  
    19  import (
    20  	"fmt"
    21  
    22  	"github.com/lirm/aeron-go/aeron/util"
    23  )
    24  
    25  var RecordDescriptor = struct {
    26  	HeaderLength     int32
    27  	RecordAlignment  int32
    28  	PaddingMsgTypeID int32
    29  	LengthOffset     int32
    30  	TypeOffset       int32
    31  }{
    32  	util.SizeOfInt32 * 2,
    33  	util.SizeOfInt32 * 2,
    34  	-1,
    35  	0,
    36  	4,
    37  }
    38  
    39  func LengthOffset(recordOffset int32) int32 {
    40  	return recordOffset
    41  }
    42  
    43  func TypeOffset(recordOffset int32) int32 {
    44  	return recordOffset + util.SizeOfInt32
    45  }
    46  
    47  func EncodedMsgOffset(recordOffset int32) int32 {
    48  	return recordOffset + RecordDescriptor.HeaderLength
    49  }
    50  
    51  func makeHeader(length, msgTypeID int32) int64 {
    52  	return ((int64(msgTypeID) & 0xFFFFFFFF) << 32) | (int64(length) & 0xFFFFFFFF)
    53  }
    54  
    55  func checkMsgTypeID(msgTypeID int32) {
    56  	if msgTypeID < 1 {
    57  		panic(fmt.Sprintf("Message type id must be greater than zero, msgTypeId=%d", msgTypeID))
    58  	}
    59  }