com.neovisionaries.ws.client

Enum WebSocketState

java.lang.Object

java.lang.Enum<WebSocketState>

com.neovisionaries.ws.client.WebSocketState

All Implemented Interfaces:

Serializable, Comparable<WebSocketState>

public enum WebSocketState
extends Enum<WebSocketState>

WebSocket state.

The initial state of a WebSocket instance is CREATED. WebSocket.connect() method is allowed to be called only when the state is CREATED. If the method is called when the state is not CREATED, a WebSocketException is thrown (its error code is NOT_IN_CREATED_STATE).

At the beginning of the implementation of connect() method, the state is changed to CONNECTING, and then onStateChanged() method of each registered listener (WebSocketListener) is called.

After the state is changed to CONNECTING, a WebSocket opening handshake is performed. If an error occurred during the handshake, the state is changed to CLOSED (onStateChanged() method of listeners is called) and a WebSocketException is thrown. There are various reasons for handshake failure. If you want to know the reason, get the error code (WebSocketError) by calling getError() method of the exception.

After the opening handshake succeeded, the state is changed to OPEN. Listeners' onStateChanged() method and onConnected() method are called in this order. Note that onConnected() method is called by another thread.

Upon either sending or receiving a close frame, a closing handshake is started. The state is changed to CLOSING and onStateChanged() method of listeners is called.

After the client and the server have exchanged close frames, the state is changed to CLOSED. Listeners' onStateChanged() method and onDisconnected() method is called in this order.

Enum Constant Summary

Enum Constants

Enum Constant and Description
CLOSED The WebSocket connection is closed.
CLOSING A closing handshake is being performed.
CONNECTING An opening handshake is being performed.
CREATED The initial state of a WebSocket instance.
OPEN The WebSocket connection is established (= the opening handshake has succeeded) and usable.

Method Summary

Modifier and Type	Method and Description
static WebSocketState	valueOf(String name) Returns the enum constant of this type with the specified name.
static WebSocketState[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

CREATED

public static final WebSocketState CREATED

The initial state of a WebSocket instance.

CONNECTING

public static final WebSocketState CONNECTING

An opening handshake is being performed.

OPEN

public static final WebSocketState OPEN

The WebSocket connection is established (= the opening handshake has succeeded) and usable.

CLOSING

public static final WebSocketState CLOSING

A closing handshake is being performed.

CLOSED

public static final WebSocketState CLOSED

The WebSocket connection is closed.

Method Detail

values

public static WebSocketState[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (WebSocketState c : WebSocketState.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static WebSocketState valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null