| /* |
| * 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(), |
| } |
| } |