Websocket documentation change

ppapi/cpp/websocket.h

Index: ppapi/cpp/websocket.h
===================================================================
--- ppapi/cpp/websocket.h	(revision 128916)
+++ ppapi/cpp/websocket.h	(working copy)
@@ -9,7 +9,8 @@
 #include "ppapi/cpp/resource.h"
 
 /// @file
-/// This file defines the WebSocket interface.
+/// This file defines the WebSocket interface providing bi-directional,
+/// full-duplex, communications over a single TCP socket.
 
 namespace pp {
 
@@ -17,7 +18,8 @@
 class InstanceHandle;
 class Var;
 
-/// The <code>WebSocket</code> class
+/// The <code>WebSocket</code> class providing bi-directional,
+/// full-duplex, communications over a single TCP socket.
 class WebSocket : public Resource {
  public:
   /// Constructs a WebSocket object.
@@ -29,104 +31,119 @@
   /// Destructs a WebSocket object.
   virtual ~WebSocket();
 
-  /// Connect() connects to the specified WebSocket server. Caller can call
-  /// this method at most once.
+  /// Connect() connects to the specified WebSocket server. You can call this
+  /// function once for an object.
   ///
   /// @param[in] url A <code>Var</code> of string type representing a WebSocket
   /// server URL.
-  /// @param[in] protocols A pointer to an array of string type
-  /// <code>Var</code> specifying sub-protocols. Each <code>Var</code>
-  /// represents one sub-protocol. This argument can be null only if
+  ///
+  /// @param[in] protocols A pointer to an array of <code>Var</code> of string
+  /// type specifying sub-protocols. Each <code>Var</code> represents one
+  /// sub-protocol. This argument can be null only if
   /// <code>protocol_count</code> is 0.
+  ///
   /// @param[in] protocol_count The number of sub-protocols in
   /// <code>protocols</code>.
-  /// @param[in] callback A <code>CompletionCallback</code> which is called
+  ///
+  /// @param[in] callback A <code>CompletionCallback</code> called
   /// when a connection is established or an error occurs in establishing
   /// connection.
   ///
   /// @return An int32_t containing an error code from
   /// <code>pp_errors.h</code>.
   /// Returns <code>PP_ERROR_BADARGUMENT</code> if specified <code>url</code>,
-  /// or <code>protocols</code> contains invalid string as
-  /// <code>The WebSocket API specification</code> defines. It corresponds to
-  /// SyntaxError of the specification.
+  /// or <code>protocols</code> contains invalid string as defined in
+  /// the WebSocket API specification. <code>PP_ERROR_BADARGUMENT</code>
+  /// corresponds to a SyntaxError in the WebSocket API specification.
   /// Returns <code>PP_ERROR_NOACCESS</code> if the protocol specified in the
   /// <code>url</code> is not a secure protocol, but the origin of the caller
-  /// has a secure scheme. Also returns it if the port specified in the
-  /// <code>url</code> is a port to which the user agent is configured to block
-  /// access because the port is a well-known port like SMTP. It corresponds to
-  /// SecurityError of the specification.
-  /// Returns <code>PP_ERROR_INPROGRESS</code> if the call is not the first
-  /// time.
+  /// has a secure scheme. Also returns <code>PP_ERROR_NOACCESS</code> if the
+  /// port specified in the <code>url</code> is a port that the user agent is
+  /// configured to block access to because it is a well-known port like SMTP.
+  /// <code>PP_ERROR_NOACCESS</code> corresponds to a SecurityError of the
+  /// specification.
+  /// Returns <code>PP_ERROR_INPROGRESS</code> if this is not the first call to
+  /// Connect().
   int32_t Connect(const Var& url, const Var protocols[],
                   uint32_t protocol_count, const CompletionCallback& callback);
 
   /// Close() closes the specified WebSocket connection by specifying
   /// <code>code</code> and <code>reason</code>.
   ///
-  /// @param[in] code The WebSocket close code. Ignored if it is 0.
-  /// @param[in] reason A <code>Var</code> of string type which represents the
-  /// WebSocket close reason. Ignored if it is undefined type.
-  /// @param[in] callback A <code>CompletionCallback</code> which is called
-  /// when the connection is closed or an error occurs in closing the
-  /// connection.
+  /// @param[in] code The WebSocket close code. This is ignored if it is 0.
+  /// <code>PP_WEBSOCKETSTATUSCODE_NORMAL_CLOSURE</code> must be used for the
+  /// usual case. To indicate some specific error cases, codes in the range
+  /// <code>PP_WEBSOCKETSTATUSCODE_USER_REGISTERED_MIN</code> to
+  /// <code>PP_WEBSOCKETSTATUSCODE_USER_REGISTERED_MAX</code>, and in the range
+  /// <code>PP_WEBSOCKETSTATUSCODE_USER_PRIVATE_MIN</code> to
+  /// <code>PP_WEBSOCKETSTATUSCODE_USER_PRIVATE_MAX</code> are available.
   ///
+  /// @param[in] reason A <code>Var</code> of string type representing the
+  /// close reason. This is ignored if it is an undefined type.
+  ///
+  /// @param[in] callback A <code>CompletionCallback</code> called when the
+  /// connection is closed or an error occurs in closing the connection.
+  ///
   /// @return An int32_t containing an error code from
   /// <code>pp_errors.h</code>.
   /// Returns <code>PP_ERROR_BADARGUMENT</code> if <code>reason</code> contains
-  /// an invalid character as a UTF-8 string, or longer than 123 bytes. It
-  /// corresponds to JavaScript SyntaxError of the specification.
+  /// an invalid character as a UTF-8 string, or is longer than 123 bytes.
+  /// <code>PP_ERROR_BADARGUMENT</code> corresponds to a JavaScript
+  /// SyntaxError in the WebSocket API specification.
   /// Returns <code>PP_ERROR_NOACCESS</code> if the code is not an integer
-  /// equal to 1000 or in the range 3000 to 4999. It corresponds to
-  /// InvalidAccessError of the specification. Returns
-  /// <code>PP_ERROR_INPROGRESS</code> if the call is not the first time.
+  /// equal to 1000 or in the range 3000 to 4999.
+  /// <code>PP_ERROR_NOACCESS</code> corresponds to an InvalidAccessError in
+  /// the WebSocket API specification. Returns <code>PP_ERROR_INPROGRESS</code>
+  /// if this is not the first call to Close().
   int32_t Close(uint16_t code, const Var& reason,
                 const CompletionCallback& callback);
 
   /// ReceiveMessage() receives a message from the WebSocket server.
   /// This interface only returns a single message. That is, this interface
-  /// must be called at least N times to receive N messages, no matter how
-  /// small each message is.
+  /// must be called at least N times to receive N messages, no matter the size
+  /// of each message.
   ///
   /// @param[out] message The received message is copied to provided
   /// <code>message</code>. The <code>message</code> must remain valid until
-  /// the ReceiveMessage operation completes. It will be a <code>Var</code> of
-  /// string or ArrayBuffer types on receiving.
-  /// @param[in] callback A <code>CompletionCallback</code> which is called
-  /// when the receiving message is completed. It is ignored if ReceiveMessage
+  /// ReceiveMessage() completes. Its received <code>Var</code> will be of
+  /// string or ArrayBuffer type.
+  ///
+  /// @param[in] callback A <code>CompletionCallback</code> called when
+  /// ReceiveMessage() completes. This callback is ignored if ReceiveMessage()
   /// completes synchronously and returns <code>PP_OK</code>.
   ///
   /// @return An int32_t containing an error code from
   /// <code>pp_errors.h</code>.
-  /// If an error is detected or connection is closed, returns
+  /// If an error is detected or connection is closed, ReceiveMessage() returns
   /// <code>PP_ERROR_FAILED</code> after all buffered messages are received.
-  /// Until buffered message become empty, continues to returns
+  /// Until buffered message become empty, ReceiveMessage() continues to return
   /// <code>PP_OK</code> as if connection is still established without errors.
   int32_t ReceiveMessage(Var* message,
                          const CompletionCallback& callback);
 
-  /// Send() sends a message to the WebSocket server.
+  /// SendMessage() sends a message to the WebSocket server.
   ///
-  /// @param[in] data A message to send. The message is copied to internal
-  /// buffer. So caller can free <code>data</code> safely after returning
-  /// from the function. It must be a <code>Var</code> of string or ArrayBuffer
-  /// types.
+  /// @param[in] message A message to send. The message is copied to an internal
+  /// buffer, so the caller can free <code>message</code> safely after returning
+  /// from the function. This <code>Var</code> must be of string or
+  /// ArrayBuffer types.
   ///
   /// @return An int32_t containing an error code from
   /// <code>pp_errors.h</code>.
   /// Returns <code>PP_ERROR_FAILED</code> if the ReadyState is
-  /// <code>PP_WEBSOCKETREADYSTATE_CONNECTING</code>. It corresponds JavaScript
-  /// InvalidStateError of the specification.
-  /// Returns <code>PP_ERROR_BADARGUMENT</code> if provided
-  /// <code>message</code> of string type contains an invalid character as a
-  /// UTF-8 string. It corresponds to JavaScript SyntaxError of the
-  /// specification.
+  /// <code>PP_WEBSOCKETREADYSTATE_CONNECTING</code>.
+  /// <code>PP_ERROR_FAILED</code> corresponds to a JavaScript
+  /// InvalidStateError in the WebSocket API specification.
+  /// Returns <code>PP_ERROR_BADARGUMENT</code> if the provided
+  /// <code>message</code> contains an invalid character as a
+  /// UTF-8 string. <code>PP_ERROR_BADARGUMENT</code> corresponds to a
+  /// JavaScript SyntaxError in the WebSocket API specification.
   /// Otherwise, returns <code>PP_OK</code>, but it doesn't necessarily mean
   /// that the server received the message.
   int32_t SendMessage(const Var& message);
 
   /// GetBufferedAmount() returns the number of bytes of text and binary
-  /// messages that have been queued for the WebSocket connection to send but
+  /// messages that have been queued for the WebSocket connection to send, but
   /// have not been transmitted to the network yet.
   ///
   /// @return Returns the number of bytes.
@@ -142,44 +159,52 @@
   /// connection.
   ///
   /// @return Returns a <code>Var</code> of string type. If called before the
-  /// close reason is set, it contains an empty string.
+  /// close reason is set, the return value contains an empty string. Returns a
+  /// <code>PP_VARTYPE_UNDEFINED</code> if called on an invalid resource.
   Var GetCloseReason();
 
   /// GetCloseWasClean() returns if the connection was closed cleanly for the
   /// specified WebSocket connection.
   ///
   /// @return Returns <code>false</code> if called before the connection is
-  /// closed, or called on an invalid resource. Otherwise, returns
-  /// <code>true</code> if the connection was closed cleanly, or returns
-  /// <code>false</code> if the connection was closed for abnormal reasons.
+  /// closed, called on an invalid resource, or closed for abnormal reasons.
+  /// Otherwise, returns <code>true</code> if the connection was closed
+  /// cleanly.
   bool GetCloseWasClean();
 
   /// GetExtensions() returns the extensions selected by the server for the
   /// specified WebSocket connection.
   ///
   /// @return Returns a <code>Var</code> of string type. If called before the
-  /// connection is established, its data is an empty string.
-  /// Currently its data is always an empty string.
+  /// connection is established, the <code>Var</code>'s data is an empty
+  /// string. Returns a <code>PP_VARTYPE_UNDEFINED</code> if called on an
+  /// invalid resource. Currently the <code>Var</code>'s data for valid
+  /// resources are always an empty string.
   Var GetExtensions();
 
   /// GetProtocol() returns the sub-protocol chosen by the server for the
   /// specified WebSocket connection.
   ///
   /// @return Returns a <code>Var</code> of string type. If called before the
-  /// connection is established, it contains the empty string.
+  /// connection is established, the <code>Var</code> contains the empty
+  /// string. Returns a code>PP_VARTYPE_UNDEFINED</code> if called on an
+  /// invalid resource.
   Var GetProtocol();
 
   /// GetReadyState() returns the ready state of the specified WebSocket
   /// connection.
   ///
   /// @return Returns <code>PP_WEBSOCKETREADYSTATE_INVALID</code> if called
-  /// before connect() is called.
+  /// before Connect() is called, or if this function is called on an
+  /// invalid resource.
   PP_WebSocketReadyState GetReadyState();
 
   /// GetURL() returns the URL associated with specified WebSocket connection.
   ///
   /// @return Returns a <code>Var</code> of string type. If called before the
-  /// connection is established, it contains the empty string.
+  /// connection is established, the <code>Var</code> contains the empty
+  /// string. Returns a <code>PP_VARTYPE_UNDEFINED</code> if this function
+  /// is called on an invalid resource.
   Var GetURL();
 };