/
hook.go
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/
hook.go
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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 aggregate
import "sync"
// HookAfterTableStatEmitted is a hook of event that new TableStats are generated.
// Each call of the hook handles a batch of tables.
type HookAfterTableStatEmitted func(stats []TableStats, allStats ClusterStats)
// AddHookAfterTableStatEmitted adds a hook of event that a new TableStats is generated.
func AddHookAfterTableStatEmitted(hk HookAfterTableStatEmitted) {
m := &hooksManager
m.lock.Lock()
defer m.lock.Unlock()
m.emittedHooks = append(m.emittedHooks, hk)
}
// HookAfterTableDropped is a hook of event that a table is dropped.
type HookAfterTableDropped func(appID int)
// AddHookAfterTableDropped adds a hook of event that a table is dropped.
func AddHookAfterTableDropped(hk HookAfterTableDropped) {
m := &hooksManager
m.lock.Lock()
defer m.lock.Unlock()
m.droppedHooks = append(m.droppedHooks, hk)
}
type tableStatsHooksManager struct {
lock sync.RWMutex
emittedHooks []HookAfterTableStatEmitted
droppedHooks []HookAfterTableDropped
}
func (m *tableStatsHooksManager) afterTableStatsEmitted(stats []TableStats, allStat ClusterStats) {
m.lock.RLock()
defer m.lock.RUnlock()
for _, hook := range m.emittedHooks {
hook(stats, allStat)
}
}
func (m *tableStatsHooksManager) afterTableDropped(appID int32) {
m.lock.RLock()
defer m.lock.RUnlock()
for _, hook := range m.droppedHooks {
hook(int(appID))
}
}
var hooksManager tableStatsHooksManager