org.zeromq

Class ZSocket

java.lang.Object

org.zeromq.ZSocket

All Implemented Interfaces:

AutoCloseable

public class ZSocket
extends Object
implements AutoCloseable

ZeroMQ sockets present an abstraction of an asynchronous message queue, with the exact queuing semantics depending on the socket type in use. Where conventional sockets transfer streams of bytes or discrete datagrams, ZeroMQ sockets transfer discrete messages.

ZeroMQ sockets being asynchronous means that the timings of the physical connection setup and tear down, reconnect and effective delivery are transparent to the user and organized by ZeroMQ itself. Further, messages may be queued in the event that a peer is unavailable to receive them.

Field Summary

Fields

Modifier and Type	Field and Description
static Charset	UTF8

Constructor Summary

Constructors

Constructor and Description
ZSocket(int socketType) Create a ZeroMQ socket

Method Summary

Methods

Modifier and Type	Method and Description
boolean	bind(String endpoint) Creates an endpoint for accepting connections and binds to it.
void	close()
boolean	connect(String endpoint) Connects the socket to an endpoint and then accepts incoming connections on that endpoint.
boolean	disconnect(String endpoint) Disconnecting a socket from an endpoint.
int	getType() Retrieve the socket type for the current 'socket'.
boolean	hasReceiveMore() Returns a boolean value indicating if the multipart message currently being read from the Socket and has more message parts to follow.
byte[]	receive()
byte[]	receive(int flags)
String	receiveStringUtf8()
String	receiveStringUtf8(int flags)
int	send(byte[] b)
int	send(byte[] b, int flags)
boolean	sendFrame(ZFrame frame, int flags) Send a frame
boolean	sendMessage(ZMsg message)
int	sendStringUtf8(String str)
int	sendStringUtf8(String str, int flags)
void	subscribe(byte[] topic)
void	subscribe(String topic)
boolean	unbind(String endpoint) Stop accepting connections on a socket.
void	unsubscribe(byte[] topic)
void	unsubscribe(String topic)

Methods inherited from class java.lang.Object

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

Field Detail

UTF8

public static final Charset UTF8

Constructor Detail

ZSocket

public ZSocket(int socketType)

Create a ZeroMQ socket

Parameters:

socketType - ZeroMQ socket type

Method Detail

getType

public int getType()

Retrieve the socket type for the current 'socket'. The socket type is specified at socket creation time and cannot be modified afterwards.

Returns:

the socket's type.

bind

public boolean bind(String endpoint)

Creates an endpoint for accepting connections and binds to it.

The endpoint argument is a string consisting of two parts as follows: transport ://address. The transport part specifies the underlying transport protocol to use. The meaning of the address part is specific to the underlying transport protocol selected.

Parameters:

endpoint - the endpoint to bind to

Returns:

returns true if bind to the endpoint was successful

unbind

public boolean unbind(String endpoint)

Stop accepting connections on a socket.

Shall unbind from the endpoint specified by the endpoint argument.

Parameters:

endpoint - the endpoint to unbind from

Returns:

returns true if unbind to the endpoint was successful

connect

public boolean connect(String endpoint)

Connects the socket to an endpoint and then accepts incoming connections on that endpoint.

The endpoint is a string consisting of a transport :// followed by an address. The transport specifies the underlying protocol to use. The address specifies the transport-specific address to connect to.

Parameters:

endpoint - the endpoint to connect to

Returns:

returns true if connecting to the endpoint was successful

disconnect

public boolean disconnect(String endpoint)

Disconnecting a socket from an endpoint.

Parameters:

endpoint - the endpoint to disconnect from

Returns:

returns true if disconnecting to endpoint was successful

hasReceiveMore

public final boolean hasReceiveMore()

Returns a boolean value indicating if the multipart message currently being read from the Socket and has more message parts to follow. If there are no message parts to follow or if the message currently being read is not a multipart message a value of false shall be returned. Otherwise, a value of true shall be returned.

Returns:

true if there are more messages to receive.

subscribe

public void subscribe(byte[] topic)

subscribe

public void subscribe(String topic)

unsubscribe

public void unsubscribe(byte[] topic)

unsubscribe

public void unsubscribe(String topic)

send

public int send(byte[] b)

send

public int send(byte[] b,
       int flags)

sendFrame

public boolean sendFrame(ZFrame frame,
                int flags)

Send a frame

Parameters:

frame -

flags -

Returns:

return true if successful

sendMessage

public boolean sendMessage(ZMsg message)

sendStringUtf8

public int sendStringUtf8(String str)

sendStringUtf8

public int sendStringUtf8(String str,
                 int flags)

receive

public byte[] receive()

receive

public byte[] receive(int flags)

receiveStringUtf8

public String receiveStringUtf8()

receiveStringUtf8

public String receiveStringUtf8(int flags)

close

public void close()

Specified by:

close in interface AutoCloseable