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allocator.go
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allocator.go
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// Copyright The OpenTelemetry Authors
//
// 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 arrow
import (
"fmt"
"os"
"github.com/apache/arrow/go/v12/arrow/memory"
)
type LimitedAllocator struct {
mem memory.Allocator
inuse uint64
limit uint64
}
func NewLimitedAllocator(mem memory.Allocator, limit uint64) *LimitedAllocator {
return &LimitedAllocator{
mem: mem,
limit: limit,
}
}
var _ memory.Allocator = &LimitedAllocator{}
type LimitError struct {
Request uint64
Inuse uint64
Limit uint64
}
var _ error = LimitError{}
func (le LimitError) Error() string {
return fmt.Sprintf("allocation size %d exceeds limit %d (in-use=%d)", le.Request, le.Limit, le.Inuse)
}
func (_ LimitError) Is(tgt error) bool {
_, ok := tgt.(LimitError)
return ok
}
func (l *LimitedAllocator) Allocate(size int) []byte {
change := uint64(size)
if l.inuse+change > l.limit {
err := LimitError{
Request: change,
Inuse: l.inuse,
Limit: l.limit,
}
// Write the error to stderr so that it is visible even if the
// panic is caught.
os.Stderr.WriteString(err.Error() + "\n")
panic(err)
}
res := l.mem.Allocate(size)
// This update will be skipped if Allocate() panics.
l.inuse += change
return res
}
func (l *LimitedAllocator) Reallocate(size int, b []byte) []byte {
change := uint64(size - len(b))
if l.inuse+change > l.limit {
err := LimitError{
Request: change,
Inuse: l.inuse,
Limit: l.limit,
}
// Write the error to stderr so that it is visible even if the
// panic is caught.
os.Stderr.WriteString(err.Error() + "\n")
panic(err)
}
res := l.mem.Reallocate(size, b)
// This update will be skipped if Reallocate() panics.
l.inuse += change
return res
}
func (l *LimitedAllocator) Free(b []byte) {
l.mem.Free(b)
// This update will be skipped if Free() panics.
l.inuse -= uint64(len(b))
}