ZMsg (JeroMQ 0.4.3 API)

java.lang.Object
- org.zeromq.ZMsg

All Implemented Interfaces:: Iterable<ZFrame>, Collection<ZFrame>, Deque<ZFrame>, Queue<ZFrame>

public class ZMsg
extends Object
implements Iterable<ZFrame>, Deque<ZFrame>

The ZMsg class provides methods to send and receive multipart messages across 0MQ sockets. This class provides a list-like container interface, with methods to work with the overall container. ZMsg messages are composed of zero or more ZFrame objects.

 // Send a simple single-frame string message on a ZMQSocket "output" socket object
 ZMsg.newStringMsg("Hello").send(output);

 // Add several frames into one message
 ZMsg msg = new ZMsg();
 for (int i = 0;i< 10;i++) {
     msg.addString("Frame" + i);
 }
 msg.send(output);

 // Receive message from ZMQSocket "input" socket object and iterate over frames
 ZMsg receivedMessage = ZMsg.recvMsg(input);
 for (ZFrame f : receivedMessage) {
     // Do something with frame f (of type ZFrame)
 }

Based on zmsg.c in czmq

Constructor Summary

Constructors
Constructor and Description

ZMsg()
Class Constructor

Constructors
Constructor and Description
`ZMsg()` Class Constructor

Method Summary

Methods
Modifier and Type	Method and Description
`boolean`	`add(byte[] data)`
`boolean`	`add(String stringValue)`
`boolean`	`add(ZFrame e)`
`boolean`	`addAll(Collection<? extends ZFrame> arg0)`
`void`	`addFirst(byte[] data)`
`void`	`addFirst(String stringValue)`
`void`	`addFirst(ZFrame e)`
`void`	`addLast(byte[] data)`
`void`	`addLast(String stringValue)`
`void`	`addLast(ZFrame e)`
`void`	`addString(String str)` Add a String as a new ZFrame to the end of list
`void`	`append(ZMsg msg)`
`void`	`clear()`
`boolean`	`contains(Object o)`
`boolean`	`containsAll(Collection<?> arg0)`
`long`	`contentSize()`
`Iterator<ZFrame>`	`descendingIterator()`
`void`	`destroy()` Destructor.
`void`	`dump()`
`void`	`dump(Appendable out)` Dump the message in human readable format.
`ZMsg`	`duplicate()` Creates copy of this ZMsg.
`ZFrame`	`element()`
`boolean`	`equals(Object o)`
`ZFrame`	`getFirst()`
`ZFrame`	`getLast()`
`int`	`hashCode()`
`boolean`	`isEmpty()`
`Iterator<ZFrame>`	`iterator()`
`static ZMsg`	`load(DataInputStream file)` Load / append a ZMsg from an open DataInputStream
`static ZMsg`	`newStringMsg(String... strings)` Create a new ZMsg from one or more Strings
`boolean`	`offer(ZFrame e)`
`boolean`	`offerFirst(ZFrame e)`
`boolean`	`offerLast(ZFrame e)`
`ZFrame`	`peek()`
`ZFrame`	`peekFirst()`
`ZFrame`	`peekLast()`
`ZFrame`	`poll()`
`ZFrame`	`pollFirst()`
`ZFrame`	`pollLast()`
`ZFrame`	`pop()`
`String`	`popString()` Pop a ZFrame and return the toString() representation of it.
`void`	`push(byte[] data)`
`void`	`push(String str)`
`void`	`push(ZFrame e)`
`static ZMsg`	`recvMsg(ZMQ.Socket socket)` Receives message from socket, returns ZMsg object or null if the recv was interrupted.
`static ZMsg`	`recvMsg(ZMQ.Socket socket, boolean wait)` Receives message from socket, returns ZMsg object or null if the recv was interrupted.
`static ZMsg`	`recvMsg(ZMQ.Socket socket, int flag)` Receives message from socket, returns ZMsg object or null if the recv was interrupted.
`ZFrame`	`remove()`
`boolean`	`remove(Object o)`
`boolean`	`removeAll(Collection<?> arg0)`
`ZFrame`	`removeFirst()`
`boolean`	`removeFirstOccurrence(Object o)`
`ZFrame`	`removeLast()`
`boolean`	`removeLastOccurrence(Object o)`
`boolean`	`retainAll(Collection<?> arg0)`
`static boolean`	`save(ZMsg msg, DataOutputStream file)` Save message to an open data output stream.
`boolean`	`send(ZMQ.Socket socket)` Send message to 0MQ socket.
`boolean`	`send(ZMQ.Socket socket, boolean destroy)` Send message to 0MQ socket, destroys contents after sending if destroy param is set to true.
`int`	`size()`
`Object[]`	`toArray()`
`<T> T[]`	`toArray(T[] arg0)`
`String`	`toString()` Returns pretty string representation of multipart message: [ frame0, frame1, ..., frameN ]
`ZFrame`	`unwrap()` Pop frame off front of message, caller now owns frame.
`void`	`wrap(ZFrame frame)` Push frame plus empty frame to front of message, before 1st frame.

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

- Constructor Detail
  - ZMsg
```
public ZMsg()
```
    Class Constructor
- Method Detail
  - destroy
```
public void destroy()
```
    Destructor. Explicitly destroys all ZFrames contains in the ZMsg
  - contentSize
```
public long contentSize()
```
    Returns:
    total number of bytes contained in all ZFrames in this ZMsg
  - addString
```
public void addString(String str)
```
    Add a String as a new ZFrame to the end of list
    
    Parameters:
    str - String to add to list
  - duplicate
```
public ZMsg duplicate()
```
    Creates copy of this ZMsg. Also duplicates all frame content.
    
    Returns:
    The duplicated ZMsg object, else null if this ZMsg contains an empty frame set
  - wrap
```
public void wrap(ZFrame frame)
```
    Push frame plus empty frame to front of message, before 1st frame. Message takes ownership of frame, will destroy it when message is sent.
    
    Parameters:
    frame -
  - unwrap
```
public ZFrame unwrap()
```
    Pop frame off front of message, caller now owns frame. If next frame is empty, pops and destroys that empty frame (e.g. useful when unwrapping ROUTER socket envelopes)
    
    Returns:
    Unwrapped frame
  - send
```
public boolean send(ZMQ.Socket socket)
```
    Send message to 0MQ socket.
    
    Parameters:
    socket - 0MQ socket to send ZMsg on.
    
    Returns:
    true if send is success, false otherwise
  - send
```
public boolean send(ZMQ.Socket socket,
           boolean destroy)
```
    Send message to 0MQ socket, destroys contents after sending if destroy param is set to true. If the message has no frames, sends nothing but still destroy()s the ZMsg object
    
    Parameters:
    socket - 0MQ socket to send ZMsg on.
    
    Returns:
    true if send is success, false otherwise
  - recvMsg
```
public static ZMsg recvMsg(ZMQ.Socket socket)
```
    Receives message from socket, returns ZMsg object or null if the recv was interrupted. Does a blocking recv, if you want not to block then use the ZLoop class or ZMQ.Poller to check for socket input before receiving or recvMsg with flag ZMQ.DONTWAIT.
    
    Parameters:
    socket -
    
    Returns:
    ZMsg object, null if interrupted
  - recvMsg
```
public static ZMsg recvMsg(ZMQ.Socket socket,
           boolean wait)
```
    Receives message from socket, returns ZMsg object or null if the recv was interrupted.
    
    Parameters:
    socket -
    wait - true to wait for next message, false to do a non-blocking recv.
    
    Returns:
    ZMsg object, null if interrupted
  - recvMsg
```
public static ZMsg recvMsg(ZMQ.Socket socket,
           int flag)
```
    Receives message from socket, returns ZMsg object or null if the recv was interrupted. Setting the flag to ZMQ.DONTWAIT does a non-blocking recv.
    
    Parameters:
    socket -
    flag - see ZMQ constants
    
    Returns:
    ZMsg object, null if interrupted
  - save
```
public static boolean save(ZMsg msg,
           DataOutputStream file)
```
    Save message to an open data output stream. Data saved as: 4 bytes: number of frames For every frame: 4 bytes: byte size of frame data + n bytes: frame byte data
    
    Parameters:
    msg - ZMsg to save
    file - DataOutputStream
    
    Returns:
    True if saved OK, else false
  - load
```
public static ZMsg load(DataInputStream file)
```
    Load / append a ZMsg from an open DataInputStream
    
    Parameters:
    file - DataInputStream connected to file
    
    Returns:
    ZMsg object
  - newStringMsg
```
public static ZMsg newStringMsg(String... strings)
```
    Create a new ZMsg from one or more Strings
    
    Parameters:
    strings - Strings to add as frames.
    
    Returns:
    ZMsg object
  - equals
```
public boolean equals(Object o)
```
    Specified by:
    
    equals in interface Collection<ZFrame>
    
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Specified by:
    
    hashCode in interface Collection<ZFrame>
    
    Overrides:
    
    hashCode in class Object
  - dump
```
public void dump(Appendable out)
```
    Dump the message in human readable format. This should only be used for debugging and tracing, inefficient in handling large messages.
  - dump
```
public void dump()
```
  - addFirst
```
public void addFirst(String stringValue)
```
  - addFirst
```
public void addFirst(byte[] data)
```
  - addLast
```
public void addLast(String stringValue)
```
  - addLast
```
public void addLast(byte[] data)
```
  - push
```
public void push(String str)
```
  - push
```
public void push(byte[] data)
```
  - add
```
public boolean add(String stringValue)
```
  - add
```
public boolean add(byte[] data)
```
  - iterator
```
public Iterator<ZFrame> iterator()
```
    Specified by:
    
    iterator in interface Iterable<ZFrame>
    
    Specified by:
    
    iterator in interface Collection<ZFrame>
    
    Specified by:
    
    iterator in interface Deque<ZFrame>
  - addAll
```
public boolean addAll(Collection<? extends ZFrame> arg0)
```
    Specified by:
    
    addAll in interface Collection<ZFrame>
  - clear
```
public void clear()
```
    Specified by:
    
    clear in interface Collection<ZFrame>
  - containsAll
```
public boolean containsAll(Collection<?> arg0)
```
    Specified by:
    
    containsAll in interface Collection<ZFrame>
  - isEmpty
```
public boolean isEmpty()
```
    Specified by:
    
    isEmpty in interface Collection<ZFrame>
  - removeAll
```
public boolean removeAll(Collection<?> arg0)
```
    Specified by:
    
    removeAll in interface Collection<ZFrame>
  - retainAll
```
public boolean retainAll(Collection<?> arg0)
```
    Specified by:
    
    retainAll in interface Collection<ZFrame>
  - toArray
```
public Object[] toArray()
```
    Specified by:
    
    toArray in interface Collection<ZFrame>
  - toArray
```
public <T> T[] toArray(T[] arg0)
```
    Specified by:
    
    toArray in interface Collection<ZFrame>
  - add
```
public boolean add(ZFrame e)
```
    Specified by:
    
    add in interface Collection<ZFrame>
    
    Specified by:
    
    add in interface Deque<ZFrame>
    
    Specified by:
    
    add in interface Queue<ZFrame>
  - addFirst
```
public void addFirst(ZFrame e)
```
    Specified by:
    
    addFirst in interface Deque<ZFrame>
  - addLast
```
public void addLast(ZFrame e)
```
    Specified by:
    
    addLast in interface Deque<ZFrame>
  - contains
```
public boolean contains(Object o)
```
    Specified by:
    
    contains in interface Collection<ZFrame>
    
    Specified by:
    
    contains in interface Deque<ZFrame>
  - descendingIterator
```
public Iterator<ZFrame> descendingIterator()
```
    Specified by:
    
    descendingIterator in interface Deque<ZFrame>
  - element
```
public ZFrame element()
```
    Specified by:
    
    element in interface Deque<ZFrame>
    
    Specified by:
    
    element in interface Queue<ZFrame>
  - getFirst
```
public ZFrame getFirst()
```
    Specified by:
    
    getFirst in interface Deque<ZFrame>
  - getLast
```
public ZFrame getLast()
```
    Specified by:
    
    getLast in interface Deque<ZFrame>
  - offer
```
public boolean offer(ZFrame e)
```
    Specified by:
    
    offer in interface Deque<ZFrame>
    
    Specified by:
    
    offer in interface Queue<ZFrame>
  - offerFirst
```
public boolean offerFirst(ZFrame e)
```
    Specified by:
    
    offerFirst in interface Deque<ZFrame>
  - offerLast
```
public boolean offerLast(ZFrame e)
```
    Specified by:
    
    offerLast in interface Deque<ZFrame>
  - peek
```
public ZFrame peek()
```
    Specified by:
    
    peek in interface Deque<ZFrame>
    
    Specified by:
    
    peek in interface Queue<ZFrame>
  - peekFirst
```
public ZFrame peekFirst()
```
    Specified by:
    
    peekFirst in interface Deque<ZFrame>
  - peekLast
```
public ZFrame peekLast()
```
    Specified by:
    
    peekLast in interface Deque<ZFrame>
  - poll
```
public ZFrame poll()
```
    Specified by:
    
    poll in interface Deque<ZFrame>
    
    Specified by:
    
    poll in interface Queue<ZFrame>
  - pollFirst
```
public ZFrame pollFirst()
```
    Specified by:
    
    pollFirst in interface Deque<ZFrame>
  - pollLast
```
public ZFrame pollLast()
```
    Specified by:
    
    pollLast in interface Deque<ZFrame>
  - pop
```
public ZFrame pop()
```
    Specified by:
    
    pop in interface Deque<ZFrame>
  - popString
```
public String popString()
```
    Pop a ZFrame and return the toString() representation of it.
    
    Returns:
    toString version of pop'ed frame, or null if no frame exists.
  - push
```
public void push(ZFrame e)
```
    Specified by:
    
    push in interface Deque<ZFrame>
  - remove
```
public ZFrame remove()
```
    Specified by:
    
    remove in interface Deque<ZFrame>
    
    Specified by:
    
    remove in interface Queue<ZFrame>
  - remove
```
public boolean remove(Object o)
```
    Specified by:
    
    remove in interface Collection<ZFrame>
    
    Specified by:
    
    remove in interface Deque<ZFrame>
  - removeFirst
```
public ZFrame removeFirst()
```
    Specified by:
    
    removeFirst in interface Deque<ZFrame>
  - removeFirstOccurrence
```
public boolean removeFirstOccurrence(Object o)
```
    Specified by:
    
    removeFirstOccurrence in interface Deque<ZFrame>
  - removeLast
```
public ZFrame removeLast()
```
    Specified by:
    
    removeLast in interface Deque<ZFrame>
  - removeLastOccurrence
```
public boolean removeLastOccurrence(Object o)
```
    Specified by:
    
    removeLastOccurrence in interface Deque<ZFrame>
  - size
```
public int size()
```
    Specified by:
    
    size in interface Collection<ZFrame>
    
    Specified by:
    
    size in interface Deque<ZFrame>
  - append
```
public void append(ZMsg msg)
```
  - toString
```
public String toString()
```
    Returns pretty string representation of multipart message: [ frame0, frame1, ..., frameN ]
    
    Overrides:
    
    toString in class Object
    
    Returns:
    toString version of ZMsg object

Class ZMsg

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

ZMsg

Method Detail

destroy

contentSize

addString

duplicate

wrap

unwrap

send

send

recvMsg

recvMsg

recvMsg

save

load

newStringMsg

equals

hashCode

dump

dump

addFirst

addFirst

addLast

addLast

push

push

add

add

iterator

addAll

clear

containsAll

isEmpty

removeAll

retainAll

toArray

toArray

add

addFirst

addLast

contains

descendingIterator

element

getFirst

getLast

offer

offerFirst

offerLast

peek

peekFirst

peekLast

poll

pollFirst

pollLast

pop

popString

push

remove

remove

removeFirst

removeFirstOccurrence

removeLast

removeLastOccurrence

size

append

toString