Package com.thecoderscorner.menu.remote

Class StreamRemoteConnector

java.lang.Object

com.thecoderscorner.menu.remote.StreamRemoteConnector

All Implemented Interfaces:

RemoteConnector

Direct Known Subclasses:

Rs232RemoteConnector, SocketBasedConnector

public abstract class StreamRemoteConnector
extends Object
implements RemoteConnector

Stream remote connector is the base class for all stream implementations, such as Socket and RS232. Any remote with stream like semantics can use this as the base for building out an adapter.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	StreamRemoteConnector.StreamState

Field Summary

Fields

Modifier and Type	Field	Description
protected ScheduledExecutorService	executor
protected org.slf4j.Logger	logger
static byte	START_OF_MSG
protected AtomicReference<StreamRemoteConnector.StreamState>	state

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	StreamRemoteConnector(MenuCommandProtocol protocol, ScheduledExecutorService executor)

Method Summary

Modifier and Type	Method	Description
void	close()	Force close a connection when its known to be bad, the connector will try and establish a new connection.
static boolean	doesBufferHaveEOM(ByteBuffer inputBuffer)
protected abstract void	getAtLeastBytes(ByteBuffer inputBuffer, int len)	Reads at least the number of bytes requested waiting if need be for more data.
boolean	isConnected()	Gets the underlying connection state for this connector.
protected void	logByteBuffer(String msg, ByteBuffer inBuffer)	Helper method that logs the entire message buffer when at debug logging level.
protected void	notifyConnection()	Helper method that notifies all connection listeners of a change in connectivity
protected void	processMessagesOnConnection()	This is the loop that handles a connection by reading messages until there's an IOException, or the transport or thread change to an end state.
protected void	readCompleteMessage(ByteBuffer inputBuffer)
void	registerConnectionChangeListener(ConnectionChangeListener listener)	Register for connection change events, when there is a change in connectivity status on the underlying transport.
void	registerConnectorListener(RemoteConnectorListener listener)	Register for connector messages, when new messages are received from this stream.
protected abstract void	sendInternal(ByteBuffer outputBuffer)	performs a send of all bytes in the output buffer until the output buffer is empty
void	sendMenuCommand(MenuCommand msg)	Sends a command to the remote with the protocol and usual headers.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.thecoderscorner.menu.remote.RemoteConnector

getConnectionName, start, stop

Field Detail

START_OF_MSG

public static final byte START_OF_MSG

See Also:

Constant Field Values

logger

protected final org.slf4j.Logger logger

executor

protected final ScheduledExecutorService executor

state

protected final AtomicReference<StreamRemoteConnector.StreamState> state

Constructor Detail

StreamRemoteConnector

protected StreamRemoteConnector(MenuCommandProtocol protocol,
                                ScheduledExecutorService executor)

Method Detail

processMessagesOnConnection

protected void processMessagesOnConnection()

This is the loop that handles a connection by reading messages until there's an IOException, or the transport or thread change to an end state.

close

public void close()

Description copied from interface: RemoteConnector

Force close a connection when its known to be bad, the connector will try and establish a new connection.

Specified by:

close in interface RemoteConnector

isConnected

public boolean isConnected()

Description copied from interface: RemoteConnector

Gets the underlying connection state for this connector.

Specified by:

isConnected in interface RemoteConnector

Returns:

the underlying connection state.

sendMenuCommand

public void sendMenuCommand(MenuCommand msg)
                     throws IOException

Sends a command to the remote with the protocol and usual headers.

Specified by:

sendMenuCommand in interface RemoteConnector

Parameters:

msg - the message to send.

Throws:

IOException - if there are issues with the transport

sendInternal

protected abstract void sendInternal(ByteBuffer outputBuffer)
                              throws IOException

performs a send of all bytes in the output buffer until the output buffer is empty

Parameters:

outputBuffer - the buffer data to be sent

Throws:

IOException - if there are problems writing

getAtLeastBytes

protected abstract void getAtLeastBytes(ByteBuffer inputBuffer,
                                        int len)
                                 throws IOException

Reads at least the number of bytes requested waiting if need be for more data.

Parameters:

inputBuffer - the buffer to read from

len - the minimum number of bytes needed

Throws:

IOException - if there are problems reading.

readCompleteMessage

protected void readCompleteMessage(ByteBuffer inputBuffer)
                            throws IOException

Throws:

IOException

registerConnectorListener

public void registerConnectorListener(RemoteConnectorListener listener)

Register for connector messages, when new messages are received from this stream.

Specified by:

registerConnectorListener in interface RemoteConnector

Parameters:

listener - the listener to be registered

registerConnectionChangeListener

public void registerConnectionChangeListener(ConnectionChangeListener listener)

Register for connection change events, when there is a change in connectivity status on the underlying transport.

Specified by:

registerConnectionChangeListener in interface RemoteConnector

Parameters:

listener - the listener

notifyConnection

protected void notifyConnection()

Helper method that notifies all connection listeners of a change in connectivity

logByteBuffer

protected void logByteBuffer(String msg,
                             ByteBuffer inBuffer)

Helper method that logs the entire message buffer when at debug logging level.

Parameters:

msg - the message to print first

inBuffer - the buffer to be logged

doesBufferHaveEOM

public static boolean doesBufferHaveEOM(ByteBuffer inputBuffer)