Pivot (GigaSpaces 16.4.0 API)

java.lang.Object
- com.gigaspaces.lrmi.nio.Pivot

```
public class Pivot
extends Object
```
The Pivot is the center of the NIO Protocol Adapter server-side implementation. It handles channel (connection) management, thread allocation and request/reply transmission.
The Pivot runs several types:
- SelectorThread: 1. Which listens on a port and accepts connection requests. When a new connection is accepted, the connection is added to the table of open connections. 2. Charge of selecting connections that have pending data (available for read).
- A group of worker threads that can handle invocation requests.
The interaction between connections, threads, requests and replies is as follows:
Each channel is associated with a SelectorThread. A SelectorThread manages all channels. SelectorThread is a thread that listens for incoming Request Packet. When a Request Packet arrives at a channel, SelectorThread builds a small bus packet that contains the channel info and dispatches it to the worker threads' queue. An available worker thread receives the bus packet from the queue, reads the Request Packet from the associated channel, performs the invocation (an up-call to the LRMI Runtime), builds a Reply Packet from the result and sends it through the channel.
A channel is closed implicitly if an IO Exception is thrown when reading or writing to the channel (for example, because the client socket is closed).
A future enhancement is to support automatic closing of channels that are inactive for a period of time. This also implies a keep-alive mechanism.
Since:

4.0

Author:

Igor Goldenberg

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class Pivot.ServerRemoteClassProviderProvider

Nested Classes
Modifier and Type	Class and Description
`static class`	`Pivot.ServerRemoteClassProviderProvider`

Constructor Summary

Constructors
Constructor and Description

Pivot(NIOConfiguration config, ProtocolAdapter protocol)

Constructors
Constructor and Description
`Pivot(NIOConfiguration config, ProtocolAdapter protocol)`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`closeConnection(ChannelEntry channelEntry)` Called by anyone who wants to close a connection.
`int`	`countRemoteObjectConnections(long remoteObjID)`
`static String`	`extractMonitoringId(RequestPacket requestPacket)`
`ChannelEntry`	`getChannelEntryFromChannel(SocketChannel channel)`
`ChannelEntry.State`	`getChannelEntryState(SocketAddress monitoredClient)`
`protected List<ChannelEntry>`	`getChannels(long remoteObjID)`
`String`	`getHostName()`
`LRMIInboundMonitoringDetailsImpl`	`getMonitoringDetails()`
`int`	`getPort()`
`List<ITransportConnection>`	`getRemoteObjectConnectionsList(long remoteObjID)`
`InetSocketAddress`	`getServerBindInetSocketAddress()`
`static String`	`getServiceDetails(Remote exportedService)`
`SystemRequestHandler`	`getSystemRequestHandler()`
`boolean`	`handleExceptionFromServer(Writer writer, Reader reader, Throwable ex)` send if possible the catch server exception to the client
`void`	`handleProtocolValidation(ChannelEntry channelEntry, Reader.ProtocolValidationContext context, ReadSelectorThread handler)`
`void`	`handleReadRequest(ChannelEntry channelEntry, Reader.Context ctx, ReadSelectorThread handler)` Called by a Reader Selector when it detects that a channel has pending data for read.
`void`	`handleRequest(RequestPacket requestPacket, ChannelEntry channelEntry)` Handles client request and sends reply to the client.
`static boolean`	`isMonitorActivity()`
`boolean`	`isProtocolValidationEnabled()`
`ChannelEntry`	`newConnection(ReadSelectorThread readHandler, SelectionKey key)` Called by the ConnMgr thread when a new connection is created.
`void`	`requestPending(ChannelEntry channel, ReplyPacket<?> respPacket, IResponseContext responseContext)`
`void`	`sendResponse(ChannelEntry channelEntry, ReplyPacket replyPacket, IResponseContext respContext)`
`void`	`unexport(long remoteObjID)` unexport supplied remote objectID and close all channel sockets

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Pivot

public Pivot(NIOConfiguration config,
             ProtocolAdapter protocol)
      throws IOException

Throws:: IOException

Method Detail

getPort
```
public int getPort()
```

getHostName
```
public String getHostName()
```

isMonitorActivity

public static boolean isMonitorActivity()

handleExceptionFromServer

public boolean handleExceptionFromServer(Writer writer,
                                         Reader reader,
                                         Throwable ex)

send if possible the catch server exception to the client

newConnection

public ChannelEntry newConnection(ReadSelectorThread readHandler,
                                  SelectionKey key)

Called by the ConnMgr thread when a new connection is created.

closeConnection
```
public void closeConnection(ChannelEntry channelEntry)
```
Called by anyone who wants to close a connection.

handleProtocolValidation

public void handleProtocolValidation(ChannelEntry channelEntry,
                                     Reader.ProtocolValidationContext context,
                                     ReadSelectorThread handler)

handleReadRequest

public void handleReadRequest(ChannelEntry channelEntry,
                              Reader.Context ctx,
                              ReadSelectorThread handler)

Called by a Reader Selector when it detects that a channel has pending data for read.

Parameters:: channelEntry - the channel representing the client connection.

requestPending

public void requestPending(ChannelEntry channel,
                           ReplyPacket<?> respPacket,
                           IResponseContext responseContext)

getChannelEntryFromChannel

public ChannelEntry getChannelEntryFromChannel(SocketChannel channel)

getServerBindInetSocketAddress
```
public InetSocketAddress getServerBindInetSocketAddress()
```
Returns:

the INetSocketAddress this Selector bind to.

handleRequest
```
public void handleRequest(RequestPacket requestPacket,
                          ChannelEntry channelEntry)
```
Handles client request and sends reply to the client. Called in the following cases: 1. by the ChannelThread when it detects that a channel has a pending two way request. 2. by the Worker in case of a one way request processing.

Parameters:

requestPacket - the request

channelEntry - a channel(socket) wrapper

extractMonitoringId

public static String extractMonitoringId(RequestPacket requestPacket)

sendResponse

public void sendResponse(ChannelEntry channelEntry,
                         ReplyPacket replyPacket,
                         IResponseContext respContext)

getChannels

protected List<ChannelEntry> getChannels(long remoteObjID)

Returns:: all channels of supplied remote objectID

unexport
```
public void unexport(long remoteObjID)
```
unexport supplied remote objectID and close all channel sockets

getRemoteObjectConnectionsList
```
public List<ITransportConnection> getRemoteObjectConnectionsList(long remoteObjID)
```
Returns:

the Transport connection info list for the supplied remote objectID.

countRemoteObjectConnections

public int countRemoteObjectConnections(long remoteObjID)

isProtocolValidationEnabled

public boolean isProtocolValidationEnabled()

getMonitoringDetails

public LRMIInboundMonitoringDetailsImpl getMonitoringDetails()

getSystemRequestHandler

public SystemRequestHandler getSystemRequestHandler()

getChannelEntryState

public ChannelEntry.State getChannelEntryState(SocketAddress monitoredClient)

getServiceDetails

public static String getServiceDetails(Remote exportedService)

Class Pivot

Nested Class Summary

Constructor Summary