//  Copyright (c) 2018 Couchbase, Inc.
//
// 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 scorch

import "time"

// RegistryAsyncErrorCallbacks should be treated as read-only after
// process init()'ialization.
var RegistryAsyncErrorCallbacks = map[string]func(error, string){}

// RegistryEventCallbacks should be treated as read-only after
// process init()'ialization.
// In the event of not having a callback, these return true.
var RegistryEventCallbacks = map[string]func(Event) bool{}

// Event represents the information provided in an OnEvent() callback.
type Event struct {
	Kind     EventKind
	Scorch   *Scorch
	Duration time.Duration
}

// EventKind represents an event code for OnEvent() callbacks.
type EventKind int

// EventKindCloseStart is fired when a Scorch.Close() has begun.
var EventKindCloseStart = EventKind(1)

// EventKindClose is fired when a scorch index has been fully closed.
var EventKindClose = EventKind(2)

// EventKindMergerProgress is fired when the merger has completed a
// round of merge processing.
var EventKindMergerProgress = EventKind(3)

// EventKindPersisterProgress is fired when the persister has completed
// a round of persistence processing.
var EventKindPersisterProgress = EventKind(4)

// EventKindBatchIntroductionStart is fired when Batch() is invoked which
// introduces a new segment.
var EventKindBatchIntroductionStart = EventKind(5)

// EventKindBatchIntroduction is fired when Batch() completes.
var EventKindBatchIntroduction = EventKind(6)

// EventKindMergeTaskIntroductionStart is fired when the merger is about to
// start the introduction of merged segment from a single merge task.
var EventKindMergeTaskIntroductionStart = EventKind(7)

// EventKindMergeTaskIntroduction is fired when the merger has completed
// the introduction of merged segment from a single merge task.
var EventKindMergeTaskIntroduction = EventKind(8)

// EventKindPreMergeCheck is fired before the merge begins to check if
// the caller should proceed with the merge.
var EventKindPreMergeCheck = EventKind(9)
