Package org.snmp4j.transport

Class TcpTransportMapping

java.lang.Object

org.snmp4j.transport.AbstractTransportMapping<TcpAddress>

org.snmp4j.transport.TcpTransportMapping

All Implemented Interfaces:

ConnectionOrientedTransportMapping<TcpAddress>, TransportMapping<TcpAddress>

Direct Known Subclasses:

DefaultTcpTransportMapping, TLSTM

public abstract class TcpTransportMapping
extends AbstractTransportMapping<TcpAddress>
implements ConnectionOrientedTransportMapping<TcpAddress>

The TcpTransportMapping is the abstract base class for TCP transport mappings.

Version:

2.8.6

Author:

Frank Fock

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	openSocketOnSending	Enable or disable automatic (re)opening the communication socket when sending a message
protected Set<Address>	suspendedAddresses
protected TcpAddress	tcpAddress

Fields inherited from class org.snmp4j.transport.AbstractTransportMapping

asyncMsgProcessingSupported, maxInboundMessageSize, maxOutboundMessageSize, transportListener

Constructor Summary

Constructors

Constructor	Description
TcpTransportMapping(TcpAddress tcpAddress)

Method Summary

Modifier and Type	Method	Description
void	addTransportStateListener(TransportStateListener l)	Adds a transport state listener that is to be informed about connection state changes.
protected void	cancelNonServerSelectionKey(SelectionKey sk)
abstract void	close()	Closes the transport an releases all bound resources synchronously.
protected void	fireConnectionStateChanged(TransportStateEvent change)
TcpAddress	getAddress()	Returns the transport address that is used by this transport mapping for sending and receiving messages.
TcpAddress	getListenAddress()	Returns the address that represents the actual incoming address this transport mapping uses to listen for incoming packets.
abstract MessageLengthDecoder	getMessageLengthDecoder()	Returns the MessageLengthDecoder used by this transport mapping.
Class<? extends Address>	getSupportedAddressClass()	Gets the Address class that is supported by this transport mapping.
protected void	handleDroppedMessageToSend(TcpAddress address, byte[] message, TransportStateReference transportStateReference)	Handle a message that could not be send to the specified address, because there is no server socket for receiving responses.
boolean	isOpenSocketOnSending()	If true and method listen() has not been called yet or the connection has been closed or reset, then listen() will be called to open the communication socket when a message is being sent using sendMessage(TcpAddress, byte[], TransportStateReference).
abstract void	listen()	Listen for incoming messages.
void	removeTransportStateListener(TransportStateListener l)	Removes the supplied transport state listener.
boolean	resumeAddress(TcpAddress addressToResumeSending)	Resume sending of messages to the specified address.
abstract void	sendMessage(TcpAddress address, byte[] message, TransportStateReference tmStateReference)	Sends a message to the supplied address using this transport.
abstract void	setConnectionTimeout(long connectionTimeout)	Sets the connection timeout.
abstract void	setMessageLengthDecoder(MessageLengthDecoder messageLengthDecoder)	Sets the MessageLengthDecoder that decodes the total message length from the header of a message.
void	setOpenSocketOnSending(boolean openSocketOnSending)	Activate or deactivate auto listen() when sendMessage(TcpAddress, byte[], TransportStateReference) is called but there is no listening socket.
void	suspendAddress(TcpAddress addressToSuspendSending)	Suspend sending of messages to the specified address, regardless if a connection is already established or not.

Methods inherited from class org.snmp4j.transport.AbstractTransportMapping

addTransportListener, fireProcessMessage, getMaxInboundMessageSize, getMaxOutboundMessageSize, isAsyncMsgProcessingSupported, removeAllTransportListeners, removeTransportListener, setAsyncMsgProcessingSupported

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.snmp4j.transport.ConnectionOrientedTransportMapping

close

Methods inherited from interface org.snmp4j.TransportMapping

addTransportListener, getMaxInboundMessageSize, getMaxOutboundMessageSize, isListening, removeTransportListener

Field Details

tcpAddress

protected TcpAddress tcpAddress

suspendedAddresses

protected Set<Address> suspendedAddresses

openSocketOnSending

protected boolean openSocketOnSending

Enable or disable automatic (re)opening the communication socket when sending a message

Constructor Details

TcpTransportMapping

public TcpTransportMapping(TcpAddress tcpAddress)

Method Details

getSupportedAddressClass

public Class<? extends Address> getSupportedAddressClass()

Description copied from interface: TransportMapping

Gets the Address class that is supported by this transport mapping.

Specified by:

getSupportedAddressClass in interface TransportMapping<TcpAddress>

Specified by:

getSupportedAddressClass in class AbstractTransportMapping<TcpAddress>

Returns:

a subclass of Address.

getAddress

public TcpAddress getAddress()

Returns the transport address that is used by this transport mapping for sending and receiving messages.

Returns:

the Address used by this transport mapping. The returned instance must not be modified!

getListenAddress

public TcpAddress getListenAddress()

Description copied from interface: TransportMapping

Returns the address that represents the actual incoming address this transport mapping uses to listen for incoming packets.

Specified by:

getListenAddress in interface TransportMapping<TcpAddress>

Returns:

the address for incoming packets or null this transport mapping is not configured to listen for incoming packets.

sendMessage

public abstract void sendMessage(TcpAddress address,
 byte[] message,
 TransportStateReference tmStateReference)
                          throws IOException

Description copied from interface: TransportMapping

Sends a message to the supplied address using this transport.

Specified by:

sendMessage in interface TransportMapping<TcpAddress>

Specified by:

sendMessage in class AbstractTransportMapping<TcpAddress>

Parameters:

address - an Address instance denoting the target address.

message - the whole message as an array of bytes.

tmStateReference - the (optional) transport model state reference as defined by RFC 5590 section 6.1.

Throws:

IOException - if any underlying IO operation fails.

listen

public abstract void listen()
                     throws IOException

Description copied from interface: TransportMapping

Listen for incoming messages. For connection oriented transports, this method needs to be called before TransportMapping.sendMessage(A, byte[], org.snmp4j.TransportStateReference) is called for the first time.

Specified by:

listen in interface TransportMapping<TcpAddress>

Specified by:

listen in class AbstractTransportMapping<TcpAddress>

Throws:

IOException - if an IO operation exception occurs while starting the listener.

close

public abstract void close()
                    throws IOException

Description copied from interface: TransportMapping

Closes the transport an releases all bound resources synchronously.

Specified by:

close in interface TransportMapping<TcpAddress>

Specified by:

close in class AbstractTransportMapping<TcpAddress>

Throws:

IOException - if any IO operation for the close fails.

getMessageLengthDecoder

public abstract MessageLengthDecoder getMessageLengthDecoder()

Returns the MessageLengthDecoder used by this transport mapping.

Specified by:

getMessageLengthDecoder in interface ConnectionOrientedTransportMapping<TcpAddress>

Returns:

a MessageLengthDecoder instance.

Since:

1.7

setMessageLengthDecoder

public abstract void setMessageLengthDecoder(MessageLengthDecoder messageLengthDecoder)

Sets the MessageLengthDecoder that decodes the total message length from the header of a message.

Specified by:

setMessageLengthDecoder in interface ConnectionOrientedTransportMapping<TcpAddress>

Parameters:

messageLengthDecoder - a MessageLengthDecoder instance.

Since:

1.7

setConnectionTimeout

public abstract void setConnectionTimeout(long connectionTimeout)

Sets the connection timeout. This timeout specifies the time a connection may be idle before it is closed.

Specified by:

setConnectionTimeout in interface ConnectionOrientedTransportMapping<TcpAddress>

Parameters:

connectionTimeout - the idle timeout in milliseconds. A zero or negative value will disable any timeout and connections opened by this transport mapping will stay opened until they are explicitly closed.

Since:

1.7

addTransportStateListener

public void addTransportStateListener(TransportStateListener l)

Description copied from interface: ConnectionOrientedTransportMapping

Adds a transport state listener that is to be informed about connection state changes.

Specified by:

addTransportStateListener in interface ConnectionOrientedTransportMapping<TcpAddress>

Parameters:

l - a TransportStateListener.

removeTransportStateListener

public void removeTransportStateListener(TransportStateListener l)

Description copied from interface: ConnectionOrientedTransportMapping

Removes the supplied transport state listener.

Specified by:

removeTransportStateListener in interface ConnectionOrientedTransportMapping<TcpAddress>

Parameters:

l - a TransportStateListener.

fireConnectionStateChanged

protected void fireConnectionStateChanged(TransportStateEvent change)

isOpenSocketOnSending

public boolean isOpenSocketOnSending()

If true and method listen() has not been called yet or the connection has been closed or reset, then listen() will be called to open the communication socket when a message is being sent using sendMessage(TcpAddress, byte[], TransportStateReference).

Returns:

true if sendMessage(TcpAddress, byte[], TransportStateReference) will ensure that a server socket is there for receiving responses, false otherwise.

Since:

2.8.6

setOpenSocketOnSending

public void setOpenSocketOnSending(boolean openSocketOnSending)

Activate or deactivate auto listen() when sendMessage(TcpAddress, byte[], TransportStateReference) is called but there is no listening socket.

Parameters:

openSocketOnSending - true if sendMessage(TcpAddress, byte[], TransportStateReference) should ensure that server socket is available for communication, false if listen() must be called explicitly.

Since:

2.8.6

suspendAddress

public void suspendAddress(TcpAddress addressToSuspendSending)

Suspend sending of messages to the specified address, regardless if a connection is already established or not. To be able to send messages again to the specified address using sendMessage(TcpAddress, byte[], TransportStateReference), call resumeAddress(org.snmp4j.smi.TcpAddress).

Specified by:

suspendAddress in interface ConnectionOrientedTransportMapping<TcpAddress>

Parameters:

addressToSuspendSending - an arbitrary remote address for which any messages send by sendMessage(TcpAddress, byte[], TransportStateReference) should be dropped before sending and reopening a connection to that address.

Since:

2.8.6

resumeAddress

public boolean resumeAddress(TcpAddress addressToResumeSending)

Resume sending of messages to the specified address.

Specified by:

resumeAddress in interface ConnectionOrientedTransportMapping<TcpAddress>

Parameters:

addressToResumeSending - an arbitrary remote address for which any messages send by sendMessage(TcpAddress, byte[], TransportStateReference) should be dropped before sending and reopening a connection to that address.

Returns:

true if the specified address was previously suspended and is now resumed to allow sending messages, false otherwise.

Since:

2.8.6

handleDroppedMessageToSend

protected void handleDroppedMessageToSend(TcpAddress address,
 byte[] message,
 TransportStateReference transportStateReference)

Handle a message that could not be send to the specified address, because there is no server socket for receiving responses.

Parameters:

address - an Address instance denoting the target address.

message - the whole message as an array of bytes.

transportStateReference - the (optional) transport model state reference as defined by RFC 5590 section 6.1.

Since:

2.8.6

cancelNonServerSelectionKey

protected void cancelNonServerSelectionKey(SelectionKey sk)