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logbuffers_test_helper.go
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logbuffers_test_helper.go
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// Copyright 2016 Stanislav Liberman
// Copyright 2022 Steven Stern
//
// 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 permissions and
// limitations under the License.
package logbuffer
import (
"os"
"unsafe"
"github.com/lirm/aeron-go/aeron/atomic"
"github.com/lirm/aeron-go/aeron/util/memmap"
)
const Filename string = "logbuffers.bin"
// NewTestingLogbuffer is a helper function to create a new memmap file and logbuffer to wrap it.
func NewTestingLogbuffer() (*LogBuffers, error) {
var logLength = (TermMinLength * PartitionCount) + LogMetaDataLength
mmap, err := memmap.NewFile(Filename, 0, int(logLength))
if err != nil {
return nil, err
}
basePtr := mmap.GetMemoryPtr()
ptr := unsafe.Add(basePtr, int64(logLength-LogMetaDataLength))
buf := atomic.MakeBuffer(ptr, LogMetaDataLength)
var meta LogBufferMetaData
meta.Wrap(buf, 0)
meta.TermLen.Set(1024)
if err := mmap.Close(); err != nil {
return nil, err
}
return Wrap(Filename), nil
}
// RemoveTestingLogbufferFile is meant to be called by defer immediately after creating it above.
func RemoveTestingLogbufferFile() error {
return os.Remove(Filename)
}