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47ca411163
- Avoids code duplication across the other targets. By having a centralized function call. - Reduce the room for race.
119 lines
2.3 KiB
Go
119 lines
2.3 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2019 MinIO, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package target
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import (
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"sync"
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"github.com/minio/minio/pkg/event"
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)
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const (
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maxStoreLimit = 10000
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)
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// MemoryStore persists events in memory.
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type MemoryStore struct {
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sync.RWMutex
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events map[string]event.Event
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eC uint16
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limit uint16
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}
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// NewMemoryStore creates a memory store instance.
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func NewMemoryStore(limit uint16) *MemoryStore {
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if limit == 0 || limit > maxStoreLimit {
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limit = maxStoreLimit
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}
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memoryStore := &MemoryStore{
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events: make(map[string]event.Event),
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limit: limit,
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}
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return memoryStore
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}
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// Open is in-effective here.
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// Implemented for interface compatibility.
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func (store *MemoryStore) Open() error {
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return nil
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}
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// Put - puts the event in store.
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func (store *MemoryStore) Put(e event.Event) error {
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store.Lock()
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defer store.Unlock()
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if store.eC == store.limit {
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return errLimitExceeded
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}
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key, kErr := getNewUUID()
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if kErr != nil {
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return kErr
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}
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store.events[key] = e
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store.eC++
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return nil
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}
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// Get - retrieves the event from store.
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func (store *MemoryStore) Get(key string) (event.Event, error) {
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store.RLock()
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defer store.RUnlock()
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if event, exist := store.events[key]; exist {
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return event, nil
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}
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return event.Event{}, errNoSuchKey
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}
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// Del - deletes the event from store.
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func (store *MemoryStore) Del(key string) error {
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store.Lock()
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defer store.Unlock()
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delete(store.events, key)
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store.eC--
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return nil
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}
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// ListN - lists atmost N keys in the store.
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func (store *MemoryStore) ListN(n int) []string {
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store.RLock()
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defer store.RUnlock()
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var i int
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if n == -1 {
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n = len(store.events)
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}
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keys := []string{}
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for k := range store.events {
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if i < n {
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keys = append(keys, k)
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i++
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continue
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} else {
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break
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}
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}
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return keys
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}
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