com.wavefront.metrics

Class ReconnectingSocket

java.lang.Object

com.wavefront.metrics.ReconnectingSocket

public class ReconnectingSocket
extends Object

Creates a TCP client suitable for the WF proxy. That is: a client which is long-lived and semantically one-way. This client tries persistently to reconnect to the given host and port if a connection is ever broken. If the server (in practice, the WF proxy) sends a TCP FIN or TCP RST, we will treat it as a "broken connection" and just try to connect again on the next call to write(). This means each ReconnectingSocket has a polling thread for the server to listen for connection resets.

Author:

Mori Bellamy (mori@wavefront.com)

Field Summary

Fields

Modifier and Type	Field and Description
protected static Logger	logger

Constructor Summary

Constructors

Constructor and Description
ReconnectingSocket(String host, int port)
ReconnectingSocket(String host, int port, SocketFactory socketFactory)
ReconnectingSocket(String host, int port, SocketFactory socketFactory, Long connectionTimeToLiveMillis, java.util.function.Supplier<Long> timeSupplier)

Method Summary

Modifier and Type	Method and Description
void	close()
void	flush() Flushes the outputStream best-effort.
void	write(String message) Try to send the given message.

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected static final Logger logger

Constructor Detail

ReconnectingSocket

public ReconnectingSocket(String host,
                          int port,
                          SocketFactory socketFactory)
                   throws IOException

Throws:

IOException - When we cannot open the remote socket.

ReconnectingSocket

public ReconnectingSocket(String host,
                          int port,
                          SocketFactory socketFactory,
                          @Nullable
                          Long connectionTimeToLiveMillis,
                          @Nullable
                          java.util.function.Supplier<Long> timeSupplier)
                   throws IOException

Parameters:

host - Hostname to connect to

port - Port to connect to

socketFactory - SocketFactory used to instantiate new sockets

connectionTimeToLiveMillis - Connection TTL, with expiration checked after each flush. When null, TTL is not enforced.

timeSupplier - Get current timestamp in millis

Throws:

IOException - When we cannot open the remote socket.

ReconnectingSocket

public ReconnectingSocket(String host,
                          int port)
                   throws IOException

Throws:

IOException

Method Detail

write

public void write(String message)
           throws Exception

Try to send the given message. On failure, reset and try again. If _that_ fails, just rethrow the exception.

Throws:

Exception - when a single retry is not enough to have a successful write to the remote host.

flush

public void flush()
           throws IOException

Flushes the outputStream best-effort. If that fails, we reset the connection.

Throws:

IOException

close

public void close()
           throws IOException

Throws:

IOException