/
event.go
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/
event.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 observer
import (
"fmt"
"math/rand"
"time"
)
func init() {
rand.Seed(time.Now().UnixNano())
}
// Event is align with Event interface in Java.
// it's the top abstraction
// Align with 2.7.5
type Event interface {
fmt.Stringer
GetSource() interface{}
GetTimestamp() time.Time
}
// BaseEvent is the base implementation of Event
// You should never use it directly
type BaseEvent struct {
Source interface{}
Timestamp time.Time
}
// GetSource return the source
func (b *BaseEvent) GetSource() interface{} {
return b.Source
}
// GetTimestamp return the Timestamp when the event is created
func (b *BaseEvent) GetTimestamp() time.Time {
return b.Timestamp
}
// String return a human readable string representing this event
func (b *BaseEvent) String() string {
return fmt.Sprintf("BaseEvent[source = %#v]", b.Source)
}
// NewBaseEvent create an BaseEvent instance
// and the Timestamp will be current timestamp
func NewBaseEvent(source interface{}) *BaseEvent {
return &BaseEvent{
Source: source,
Timestamp: time.Now(),
}
}