mirror of
https://gitee.com/milvus-io/milvus.git
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62 lines
2.0 KiB
Go
62 lines
2.0 KiB
Go
// Copyright (C) 2019-2020 Zilliz. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software distributed under the License
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// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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// or implied. See the License for the specific language governing permissions and limitations under the License.
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package dablooms
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/*
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#cgo CFLAGS: -I${SRCDIR}/cwrapper
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#cgo LDFLAGS: -L${SRCDIR}/cwrapper/output -ldablooms -lstdc++ -lm
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#include <stdlib.h>
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#include <dablooms.h>
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*/
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import "C"
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import (
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"unsafe"
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)
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// ScalingBloom is a scaling bloom filter that supports remove elements after added
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type ScalingBloom struct {
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cfilter *C.scaling_bloom_t
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}
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// NewScalingBloom returns a ScalingBloom object
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func NewScalingBloom(capacity uint64, errorRate float64) *ScalingBloom {
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sb := &ScalingBloom{
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cfilter: C.new_scaling_bloom(C.uint(capacity), C.double(errorRate)),
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}
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return sb
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}
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// Destroy is used to free memory of this object
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func (sb *ScalingBloom) Destroy() {
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C.free_scaling_bloom(sb.cfilter)
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}
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// Add is used to add an element to this bloom filter
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func (sb *ScalingBloom) Add(key []byte, id int64) bool {
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cKey := (*C.char)(unsafe.Pointer(&key[0]))
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return C.scaling_bloom_add(sb.cfilter, cKey, C.size_t(len(key)), C.uint64_t(id)) == 1
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}
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// Remove is used to remove an element from this bloom filter
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func (sb *ScalingBloom) Remove(key []byte, id int64) bool {
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cKey := (*C.char)(unsafe.Pointer(&key[0]))
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return C.scaling_bloom_remove(sb.cfilter, cKey, C.size_t(len(key)), C.uint64_t(id)) == 1
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}
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// Check returns whether a key may exist in this bloom filter
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func (sb *ScalingBloom) Check(key []byte) bool {
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cKey := (*C.char)(unsafe.Pointer(&key[0]))
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return C.scaling_bloom_check(sb.cfilter, cKey, C.size_t(len(key))) == 1
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}
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