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events.go
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events.go
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/*
* Copyright (c) 2008-2021, Hazelcast, Inc. All Rights Reserved.
*
* 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 cluster
import (
pubcluster "github.com/hazelcast/hazelcast-go-client/cluster"
)
const (
// EventConnection is dispatched when a connection to a member is opened/closed.
EventConnection = "internal.cluster.connection"
// EventMembers is dispatched when cluster service finds out new members are added to the cluster
// or when members are removed from cluster
EventMembers = "internal.cluster.members"
// EventCluster is dispatched after the very first connection to the cluster or the first connection after client disconnected.
//and dispatched when all connections to the cluster are closed.
EventCluster = "internal.cluster.cluster"
)
type ConnectionEventHandler func(event *ConnectionStateChangedEvent)
type ConnectedHandler func(event *ClusterStateChangedEvent)
type ConnectionState int
const (
ConnectionStateOpened ConnectionState = iota
ConnectionStateClosed
)
type ConnectionStateChangedEvent struct {
Conn *Connection
Err error
state ConnectionState
}
func NewConnectionOpened(conn *Connection) *ConnectionStateChangedEvent {
return &ConnectionStateChangedEvent{Conn: conn, Err: nil, state: ConnectionStateOpened}
}
func NewConnectionClosed(conn *Connection, err error) *ConnectionStateChangedEvent {
return &ConnectionStateChangedEvent{
Conn: conn,
Err: err,
state: ConnectionStateClosed,
}
}
func (c ConnectionStateChangedEvent) EventName() string {
return EventConnection
}
type MembersState int
const (
MembersStateAdded MembersState = iota
MembersStateRemoved
)
type MembersStateChangedEvent struct {
Members []pubcluster.MemberInfo
State MembersState
}
func NewMembersAdded(members []pubcluster.MemberInfo) *MembersStateChangedEvent {
return &MembersStateChangedEvent{Members: members, State: MembersStateAdded}
}
func (m MembersStateChangedEvent) EventName() string {
return EventMembers
}
func NewMemberRemoved(members []pubcluster.MemberInfo) *MembersStateChangedEvent {
return &MembersStateChangedEvent{Members: members, State: MembersStateRemoved}
}
type ClusterState int
const (
ClusterStateConnected ClusterState = iota
ClusterStateDisconnected
)
type ClusterStateChangedEvent struct {
Addr pubcluster.Address
State ClusterState
}
func NewConnected(addr pubcluster.Address) *ClusterStateChangedEvent {
return &ClusterStateChangedEvent{Addr: addr, State: ClusterStateConnected}
}
func (e *ClusterStateChangedEvent) EventName() string {
return EventCluster
}
func NewDisconnected() *ClusterStateChangedEvent {
return &ClusterStateChangedEvent{Addr: "", State: ClusterStateDisconnected}
}