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MID Profile: Interface DatagramConnection
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javax.microedition.io</FONT>
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Interface DatagramConnection</H2>
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<DT><B>All Superinterfaces:</B> <DD><A HREF="../../../javax/microedition/io/Connection.html">Connection</A></DD>
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<DT><B>All Known Subinterfaces:</B> <DD><A HREF="../../../javax/microedition/io/UDPDatagramConnection.html">UDPDatagramConnection</A></DD>
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<DT>public interface <B>DatagramConnection</B><DT>extends <A HREF="../../../javax/microedition/io/Connection.html">Connection</A></DL>
<P>
This interface defines the capabilities that a datagram connection must have. <p> Reminder: In common with all the other addressing schemes used for I/O in CLDC, the syntax for datagram addressing is not defined in the CLDC Specification. Syntax definition can only be take place at the profile level. The reason for this is that the datagram interface classes of CLDC can be used for implementing various kinds of datagram protocols. Examples include IP and WDP networks as well as infrared beaming protocols used by various PDAs and other devices. All these protocols use very different addressing mechanisms. <p> In the sample implementation provided as part of the CLDC reference implementation, the following addressing scheme is used for UDP datagrams. <p> The parameter string describing the target of a connection in the CLDC reference implementation takes the following form: <pre> {protocol}://[{host}]:[{port}] </pre> A datagram connection can be opened in a "client" mode or "server" mode. If the "//{host}" part is missing then the connection is opened as a "server" (by "server", we mean that a client application initiates communication). When the "//{host}" part is specified, the connection is opened as a "client". <p> Examples: <p> A datagram connection for accepting datagrams<br> datagram://:1234<p> A datagram connection for sending to a server:<br> datagram://123.456.789.12:1234<p> Note that the port number in "server mode" (unspecified host name) is that of the receiving port. The port number in "client mode" (host name specified) is that of the target port. The reply-to port in both cases is never unspecified. In "server mode", the same port number is used for both receiving and sending. In "client mode", the reply-to port is always dynamically allocated. <p> The allocation of datagram objects is done in a more abstract way than in J2SE. This is to allow a single platform to support several different datagram interfaces simultaneously. Datagram objects must be allocated by calling the "newDatagram" method of the DatagramConnection object. The resulting object is defined using another interface type called "javax.microedition.io.Datagram".
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<DT><B>Since: </B><DD>CLDC 1.0</DD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/io/DatagramConnection.html#getMaximumLength()">getMaximumLength</A></B>()</CODE>
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Get the maximum length a datagram can be.</TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/io/DatagramConnection.html#getNominalLength()">getNominalLength</A></B>()</CODE>
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Get the nominal length of a datagram.</TD>
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<CODE> <A HREF="../../../javax/microedition/io/Datagram.html">Datagram</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/io/DatagramConnection.html#newDatagram(byte[], int)">newDatagram</A></B>(byte[] buf, int size)</CODE>
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Make a new datagram object.</TD>
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<CODE> <A HREF="../../../javax/microedition/io/Datagram.html">Datagram</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/io/DatagramConnection.html#newDatagram(byte[], int, java.lang.String)">newDatagram</A></B>(byte[] buf, int size, <A HREF="../../../java/lang/String.html">String</A> addr)</CODE>
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Make a new datagram object.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../javax/microedition/io/Datagram.html">Datagram</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/io/DatagramConnection.html#newDatagram(int)">newDatagram</A></B>(int size)</CODE>
<BR>
Make a new datagram object automatically allocating a buffer.</TD>
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<CODE> <A HREF="../../../javax/microedition/io/Datagram.html">Datagram</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/io/DatagramConnection.html#newDatagram(int, java.lang.String)">newDatagram</A></B>(int size, <A HREF="../../../java/lang/String.html">String</A> addr)</CODE>
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Make a new datagram object.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/io/DatagramConnection.html#receive(javax.microedition.io.Datagram)">receive</A></B>(<A HREF="../../../javax/microedition/io/Datagram.html">Datagram</A> dgram)</CODE>
<BR>
Receive a datagram.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/io/DatagramConnection.html#send(javax.microedition.io.Datagram)">send</A></B>(<A HREF="../../../javax/microedition/io/Datagram.html">Datagram</A> dgram)</CODE>
<BR>
Send a datagram.</TD>
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