/
factory.go
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/
factory.go
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// Copyright 2023 The Cockroach 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.
//
// SPDX-License-Identifier: Apache-2.0
package schemawatch
import (
"context"
"sync"
"github.com/cockroachdb/cdc-sink/internal/types"
"github.com/cockroachdb/cdc-sink/internal/util/diag"
"github.com/cockroachdb/cdc-sink/internal/util/ident"
"github.com/cockroachdb/cdc-sink/internal/util/stopper"
)
// factory is a memoizing factory for watcher instances.
type factory struct {
pool *types.TargetPool
stop *stopper.Context
mu struct {
sync.RWMutex
data *ident.SchemaMap[*watcher]
}
}
var (
_ diag.Diagnostic = (*factory)(nil)
_ types.Watchers = (*factory)(nil)
)
// Diagnostic returns all known schema data.
func (f *factory) Diagnostic(_ context.Context) any {
ret := make(map[string]any)
f.mu.RLock()
defer f.mu.RUnlock()
_ = f.mu.data.Range(func(sch ident.Schema, w *watcher) error {
ret[sch.Raw()] = w.Get()
return nil
})
return ret
}
// Get creates or returns a memoized watcher for the given database.
func (f *factory) Get(db ident.Schema) (types.Watcher, error) {
if ret := f.getUnlocked(db); ret != nil {
return ret, nil
}
return f.createUnlocked(db)
}
func (f *factory) createUnlocked(db ident.Schema) (*watcher, error) {
f.mu.Lock()
defer f.mu.Unlock()
if ret := f.mu.data.GetZero(db); ret != nil {
return ret, nil
}
ret, err := newWatcher(f.stop, f.pool, db)
if err != nil {
return nil, err
}
f.mu.data.Put(db, ret)
return ret, nil
}
func (f *factory) getUnlocked(db ident.Schema) *watcher {
f.mu.RLock()
defer f.mu.RUnlock()
return f.mu.data.GetZero(db)
}