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queue.go
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queue.go
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// Copyright (C) 2022 PuzzleDB Contributors.
//
// 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 coordinator
import (
"github.com/cybergarage/puzzledb-go/puzzledb/coordinator"
)
// MessageQueue is a queue for coordinator message.
type MessageQueue struct {
messages []coordinator.Message
}
// NewMessageQueue returns a new messageQueue.
func NewMessageQueue() *MessageQueue {
return &MessageQueue{
messages: make([]coordinator.Message, 0),
}
}
// EnqueueMessage appends a message to the queue.
func (q *MessageQueue) EnqueueMessage(msg coordinator.Message) {
q.messages = append(q.messages, msg)
}
// PushMessage pushes a message to the queue.
func (q *MessageQueue) PushMessage(msg coordinator.Message) {
q.messages = append([]coordinator.Message{msg}, q.messages...)
}
// PopMessage removes a message from the queue.
func (q *MessageQueue) PopMessage() (coordinator.Message, error) {
if len(q.messages) == 0 {
return nil, coordinator.ErrNoMessage
}
msg := q.messages[0]
q.messages = q.messages[1:]
return msg, nil
}