NodeExtension (Hazelcast Root 3.8.5 API)

All Known Implementing Classes:

DefaultNodeExtension
```
@PrivateApi
public interface NodeExtension
```
NodeExtension is a Node extension mechanism to be able to plug different implementations of some modules, like; SerializationService, SocketChannelWrapperFactory etc.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`void`	`afterStart()` Called after node is started
`void`	`beforeJoin()` Called before node attempts to join to the cluster
`void`	`beforeShutdown()` Called before `Node.shutdown()`
`void`	`beforeStart()` Called before node is started
`Map<String,Object>`	`createExtensionServices()` Creates additional extension services, which will be registered by service manager during start-up.
`String`	`createMemberUuid(Address address)` Creates a UUID for local member
`ReadHandler`	`createReadHandler(TcpIpConnection connection, IOService ioService)` Creates a `ReadHandler` for given `Connection` instance.
`InternalSerializationService`	`createSerializationService()` Creates a `SerializationService` instance to be used by this `Node`.
`<T> T`	`createService(Class<T> type)` Creates a service which is an implementation of given type parameter.
`WriteHandler`	`createWriteHandler(TcpIpConnection connection, IOService ioService)` Creates a `WriteHandler` for given `Connection` instance.
`HotRestartService`	`getHotRestartService()` Returns the public hot restart service
`InternalHotRestartService`	`getInternalHotRestartService()` Returns the internal hot restart service
`MemberSocketInterceptor`	`getMemberSocketInterceptor()` Returns `MemberSocketInterceptor` for this `Node` if available, otherwise returns null.
`MemoryStats`	`getMemoryStats()` Returns MemoryStats of for the JVM and current HazelcastInstance.
`SecurityContext`	`getSecurityContext()` Returns `SecurityContext` for this `Node` if available, otherwise returns null.
`SocketChannelWrapperFactory`	`getSocketChannelWrapperFactory()` Returns `SocketChannelWrapperFactory` instance to be used by this `Node`.
`boolean`	`isNodeVersionCompatibleWith(Version clusterVersion)` Check if this node's codebase version is compatible with given cluster version.
`boolean`	`isStartCompleted()` Returns true if the instance has started
`void`	`onClusterStateChange(ClusterState newState, boolean isTransient)` Called when cluster state is changed
`void`	`onClusterVersionChange(Version newVersion)` Called after cluster version is changed.
`void`	`onPartitionStateChange()` Called when partition state (partition assignments, version etc) changes
`void`	`onThreadStart(Thread thread)` Called on thread start to inject/intercept extension specific logic, like; registering thread in some service, executing a special method before thread starts to do its own task.
`void`	`onThreadStop(Thread thread)` Called before a thread stops to clean/release injected by `onThreadStart(Thread)`.
`void`	`printNodeInfo()` Called to print node information during startup
`boolean`	`registerListener(Object listener)` Registers given listener if it's a known type.
`void`	`shutdown()` Shutdowns `NodeExtension`.
`void`	`validateJoinRequest(JoinMessage joinMessage)` Executed on the master node before allowing a new member to join from `ClusterJoinManager.handleJoinRequest(JoinRequest, Connection)`.

- Method Detail
  - beforeStart
```
void beforeStart()
```
    Called before node is started
  - printNodeInfo
```
void printNodeInfo()
```
    Called to print node information during startup
  - beforeJoin
```
void beforeJoin()
```
    Called before node attempts to join to the cluster
  - afterStart
```
void afterStart()
```
    Called after node is started
  - isStartCompleted
```
boolean isStartCompleted()
```
    Returns true if the instance has started
  - beforeShutdown
```
void beforeShutdown()
```
    Called before Node.shutdown()
  - shutdown
```
void shutdown()
```
    Shutdowns NodeExtension. Called on Node.shutdown()
  - createSerializationService
```
InternalSerializationService createSerializationService()
```
    Creates a SerializationService instance to be used by this Node.
    
    Returns:
    
    a SerializationService instance
  - getSecurityContext
```
SecurityContext getSecurityContext()
```
    Returns SecurityContext for this Node if available, otherwise returns null.
    
    Returns:
    
    security context
  - createService
```
<T> T createService(Class<T> type)
```
    Creates a service which is an implementation of given type parameter.
    
    Parameters:
    
    type - type of service
    
    Returns:
    
    service implementation
    
    Throws:
    
    IllegalArgumentException - if type is not known
  - createExtensionServices
```
Map<String,Object> createExtensionServices()
```
    Creates additional extension services, which will be registered by service manager during start-up. By default returned map will be empty.
    
    Returns:
    
    extension services
  - getMemberSocketInterceptor
```
MemberSocketInterceptor getMemberSocketInterceptor()
```
    Returns MemberSocketInterceptor for this Node if available, otherwise returns null.
    
    Returns:
    
    MemberSocketInterceptor
  - getSocketChannelWrapperFactory
```
SocketChannelWrapperFactory getSocketChannelWrapperFactory()
```
    Returns SocketChannelWrapperFactory instance to be used by this Node.
    
    Returns:
    
    SocketChannelWrapperFactory
  - createReadHandler
```
ReadHandler createReadHandler(TcpIpConnection connection,
                              IOService ioService)
```
    Creates a ReadHandler for given Connection instance.
    
    Parameters:
    
    connection - tcp-ip connection
    
    ioService - IOService
    
    Returns:
    
    the created ReadHandler.
  - createWriteHandler
```
WriteHandler createWriteHandler(TcpIpConnection connection,
                                IOService ioService)
```
    Creates a WriteHandler for given Connection instance.
    
    Parameters:
    
    connection - tcp-ip connection
    
    ioService - IOService
    
    Returns:
    
    the created WriteHandler
  - onThreadStart
```
void onThreadStart(Thread thread)
```
    Called on thread start to inject/intercept extension specific logic, like; registering thread in some service, executing a special method before thread starts to do its own task.
    
    Parameters:
    
    thread - thread starting
  - onThreadStop
```
void onThreadStop(Thread thread)
```
    Called before a thread stops to clean/release injected by onThreadStart(Thread).
    
    Parameters:
    
    thread - thread stopping
  - getMemoryStats
```
MemoryStats getMemoryStats()
```
    Returns MemoryStats of for the JVM and current HazelcastInstance.
    
    Returns:
    
    memory statistics
  - validateJoinRequest
```
void validateJoinRequest(JoinMessage joinMessage)
```
    Executed on the master node before allowing a new member to join from ClusterJoinManager.handleJoinRequest(JoinRequest, Connection). Implementation should check if the JoinMessage should be allowed to proceed, otherwise throw an exception with a message explaining rejection reason.
  - onClusterStateChange
```
void onClusterStateChange(ClusterState newState,
                          boolean isTransient)
```
    Called when cluster state is changed
    
    Parameters:
    
    newState - new state
    
    isTransient - status of the change. A cluster state change may be transient if it has been done temporarily during system operations such cluster start etc.
  - onPartitionStateChange
```
void onPartitionStateChange()
```
    Called when partition state (partition assignments, version etc) changes
  - onClusterVersionChange
```
void onClusterVersionChange(Version newVersion)
```
    Called after cluster version is changed.
    
    Parameters:
    
    newVersion - the new version at which the cluster operates.
  - isNodeVersionCompatibleWith
```
boolean isNodeVersionCompatibleWith(Version clusterVersion)
```
    Check if this node's codebase version is compatible with given cluster version.
    
    Parameters:
    
    clusterVersion - the cluster version to check against
    
    Returns:
    
    true if compatible, otherwise false.
  - registerListener
```
boolean registerListener(Object listener)
```
    Registers given listener if it's a known type.
    
    Parameters:
    
    listener - listener instance
    
    Returns:
    
    true if listener is registered, false otherwise
  - getHotRestartService
```
HotRestartService getHotRestartService()
```
    Returns the public hot restart service
  - getInternalHotRestartService
```
InternalHotRestartService getInternalHotRestartService()
```
    Returns the internal hot restart service
  - createMemberUuid
```
String createMemberUuid(Address address)
```
    Creates a UUID for local member
    
    Parameters:
    
    address - address of local member
    
    Returns:
    
    new uuid

Interface NodeExtension

Method Summary

Method Detail

beforeStart

printNodeInfo

beforeJoin

afterStart

isStartCompleted

beforeShutdown

shutdown

createSerializationService

getSecurityContext

createService

createExtensionServices

getMemberSocketInterceptor

getSocketChannelWrapperFactory

createReadHandler

createWriteHandler

onThreadStart

onThreadStop

getMemoryStats

validateJoinRequest

onClusterStateChange

onPartitionStateChange

onClusterVersionChange

isNodeVersionCompatibleWith

registerListener

getHotRestartService

getInternalHotRestartService

createMemberUuid