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package org.glassfish.grizzly.websockets;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import org.glassfish.grizzly.http.HttpRequestPacket;
import org.glassfish.grizzly.http.util.Header;
/**
* Abstract server-side {@link WebSocket} application, which will handle
* application {@link WebSocket}s events.
*
* @author Alexey Stashok
*/
public abstract class WebSocketApplication extends WebSocketAdapter {
/*
* WebSockets registered with this application.
*/
private final ConcurrentMap sockets = new ConcurrentHashMap<>();
private final List supportedExtensions = new ArrayList(2);
private final List supportedProtocols = new ArrayList(2);
// ---------------------------------------------------------- Public Methods
/**
* Factory method to create new {@link WebSocket} instances. Developers may
* wish to override this to return customized {@link WebSocket} implementations.
*
* @param handler the {@link ProtocolHandler} to use with the newly created
* {@link WebSocket}.
*
* @param listeners the {@link WebSocketListener}s to associate with the new
* {@link WebSocket}.
*
* @return a new {@link WebSocket} instance.
*
* @deprecated Use {@link WebSocketApplication#createSocket(ProtocolHandler, org.glassfish.grizzly.http.HttpRequestPacket, WebSocketListener...)}
*/
@Deprecated
public WebSocket createSocket(ProtocolHandler handler, WebSocketListener... listeners) {
return createSocket(handler, null, listeners);
}
/**
* Factory method to create new {@link WebSocket} instances. Developers may
* wish to override this to return customized {@link WebSocket} implementations.
* @param handler the {@link ProtocolHandler} to use with the newly created
* {@link WebSocket}.
* @param requestPacket the {@link HttpRequestPacket} that triggered the
* creation of the {@link WebSocket} connection.
* @param listeners the {@link WebSocketListener}s to associate with the new
* {@link WebSocket}.
* @return
*/
public WebSocket createSocket(final ProtocolHandler handler,
final HttpRequestPacket requestPacket,
final WebSocketListener... listeners) {
return new DefaultWebSocket(handler, requestPacket, listeners);
}
/**
* When a {@link WebSocket#onClose(DataFrame)} is invoked, the {@link WebSocket}
* will be unassociated with this application and closed.
*
* If this method is overridden, the overriding method must
* call {@link #remove(WebSocket)}. This is necessary to ensure WebSocket
* instances are not leaked nor are message operations against closed sockets
* are performed.
*
* @param socket the {@link WebSocket} being closed.
* @param frame the closing frame.
*/
@Override
public void onClose(WebSocket socket, DataFrame frame) {
remove(socket);
socket.close();
}
/**
* When a new {@link WebSocket} connection is made to this application, the
* {@link WebSocket} will be associated with this application.
*
* If this method is overridden, the overriding method must
* call {@link #add(WebSocket)}. This is necessary to ensure bulk message
* sending via facilities such as {@link Broadcaster} function properly.
*
* @param socket the new {@link WebSocket} connection.
*/
@Override
public void onConnect(WebSocket socket) {
add(socket);
}
/**
* Invoked during the handshake if the client has advertised extensions
* it may use and one or more extensions intersect with those returned
* by {@link #getSupportedExtensions()}.
*
* The {@link Extension}s passed to this method will include any extension
* parameters included by the client. It's up to this method to re-order
* and or adjust any parameter values within the list. This method must not
* add any extensions that weren't originally in the list, but it is acceptable
* to remove one or all extensions if for some reason they can't be supported.
*
* If not overridden, the List will be sent as-is back to the client.
*
* @param extensions the intersection of extensions between client and
* application.
*
* @since 2.3
*/
public void onExtensionNegotiation(List extensions) {
}
/**
* Checks protocol specific information can and should be upgraded.
*
* The default implementation will check for the presence of the
* Upgrade header with a value of WebSocket.
* If present, {@link #isApplicationRequest(org.glassfish.grizzly.http.HttpRequestPacket)}
* will be invoked to determine if the request is a valid websocket request.
*
* @return true if the request should be upgraded to a
* WebSocket connection
*/
public final boolean upgrade(HttpRequestPacket request) {
return "WebSocket".equalsIgnoreCase(request.getHeader(Header.Upgrade)) && isApplicationRequest(request);
}
/**
* Checks application specific criteria to determine if this application can
* process the request as a WebSocket connection.
*
* @param request the incoming HTTP request.
* @return true if this application can service this request
*
* @deprecated URI mapping shouldn't be intrinsic to the application.
* WebSocketApplications should be registered using {@link WebSocketEngine#register(String, String, WebSocketApplication)}
* using standard Servlet url-pattern rules.
*/
public boolean isApplicationRequest(HttpRequestPacket request) {
return false;
}
/**
* Return the websocket extensions supported by this WebSocketApplication.
* The {@link Extension}s added to this {@link List} should not include
* any {@link Extension.Parameter}s as they will be ignored. This is used
* exclusively for matching the requested extensions.
*
* @return the websocket extensions supported by this
* WebSocketApplication.
*/
public List getSupportedExtensions() {
return supportedExtensions;
}
/**
*
*
* @param subProtocol
* @return
*/
public List getSupportedProtocols(List subProtocol) {
return supportedProtocols;
}
// ------------------------------------------------------- Protected Methods
/**
* Returns a set of {@link WebSocket}s, registered with the application.
* The returned set is unmodifiable, the possible modifications may cause exceptions.
*
* @return a set of {@link WebSocket}s, registered with the application.
*/
protected Set getWebSockets() {
return sockets.keySet();
}
/**
* Associates the specified {@link WebSocket} with this application.
*
* @param socket the {@link WebSocket} to associate with this application.
*
* @return true if the socket was successfully associated,
* otherwise returns false.
*/
protected boolean add(WebSocket socket) {
return sockets.put(socket, Boolean.TRUE) == null;
}
/**
* Unassociates the specified {@link WebSocket} with this application.
*
* @param socket the {@link WebSocket} to unassociate with this application.
*
* @return true if the socket was successfully unassociated,
* otherwise returns false.
*/
public boolean remove(WebSocket socket) {
return sockets.remove(socket) != null;
}
/**
* This method will be called, when initial {@link WebSocket} handshake
* process has been completed, but allows the application to perform further
* negotiation/validation.
*
* @throws HandshakeException error occurred during the handshake.
*/
protected void handshake(HandShake handshake) throws HandshakeException {
}
/**
* This method will be invoked if an unexpected exception is caught by
* the WebSocket runtime.
*
* @param webSocket the websocket being processed at the time the
* exception occurred.
* @param t the unexpected exception.
*
* @return true if the WebSocket should be closed otherwise
* false.
*/
protected boolean onError(final WebSocket webSocket,
final Throwable t) {
return true;
}
}
