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OtpMsg (Java-Erlang Interface Library)
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SUMMARY: NESTED | <A HREF="#field_summary">FIELD</A> | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD>
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<H2>
<FONT SIZE="-1">
com.ericsson.otp.erlang</FONT>
<BR>
Class OtpMsg</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.ericsson.otp.erlang.OtpMsg</B>
</PRE>
<HR>
<DL>
<DT><PRE>public class <B>OtpMsg</B><DT>extends java.lang.Object</DL>
</PRE>
<P>
<p>
Provides a carrier for Erlang messages.
</p>
<p>
Instances of this class are created to package header and payload information
in received Erlang messages so that the recipient can obtain both parts with
a single call to <A HREF="../../../../com/ericsson/otp/erlang/OtpMbox.html#receiveMsg()"><CODE>receiveMsg()</CODE></A>.
</p>
<p>
The header information that is available is as follows: <lu>
<li> a tag indicating the type of message
<li> the intended recipient of the message, either as a
<A HREF="../../../../com/ericsson/otp/erlang/OtpErlangPid.html" title="class in com.ericsson.otp.erlang"><CODE>pid</CODE></A> or as a String, but never both.
<li> (sometimes) the sender of the message. Due to some eccentric
characteristics of the Erlang distribution protocol, not all messages have
information about the sending process. In particular, only messages whose tag
is <A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#regSendTag"><CODE>regSendTag</CODE></A> contain sender information. </lu>
<p>
Message are sent using the Erlang external format (see separate
documentation). When a message is received and delivered to the recipient
<A HREF="../../../../com/ericsson/otp/erlang/OtpMbox.html" title="class in com.ericsson.otp.erlang"><CODE>mailbox</CODE></A>, the body of the message is still in this external
representation until <A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#getMsg()"><CODE>getMsg()</CODE></A> is called, at which point the
message is decoded. A copy of the decoded message is stored in the OtpMsg so
that subsequent calls to <A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#getMsg()"><CODE>getMsg()</CODE></A> do not require that the
message be decoded a second time.
</p>
<P>
<P>
<HR>
<P>
<!-- =========== FIELD SUMMARY =========== -->
<A NAME="field_summary"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Field Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#exit2Tag">exit2Tag</A></B></CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#exitTag">exitTag</A></B></CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected <A HREF="../../../../com/ericsson/otp/erlang/OtpErlangPid.html" title="class in com.ericsson.otp.erlang">OtpErlangPid</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#from">from</A></B></CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#linkTag">linkTag</A></B></CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected <A HREF="../../../../com/ericsson/otp/erlang/OtpInputStream.html" title="class in com.ericsson.otp.erlang">OtpInputStream</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#paybuf">paybuf</A></B></CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected <A HREF="../../../../com/ericsson/otp/erlang/OtpErlangObject.html" title="class in com.ericsson.otp.erlang">OtpErlangObject</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#payload">payload</A></B></CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#regSendTag">regSendTag</A></B></CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#sendTag">sendTag</A></B></CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#tag">tag</A></B></CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected <A HREF="../../../../com/ericsson/otp/erlang/OtpErlangPid.html" title="class in com.ericsson.otp.erlang">OtpErlangPid</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#to">to</A></B></CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#toName">toName</A></B></CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#unlinkTag">unlinkTag</A></B></CODE>
<BR>
</TD>
</TR>
</TABLE>
<!-- ========== METHOD SUMMARY =========== -->
<A NAME="method_summary"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Method Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../com/ericsson/otp/erlang/OtpErlangObject.html" title="class in com.ericsson.otp.erlang">OtpErlangObject</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#getMsg()">getMsg</A></B>()</CODE>
<BR>
Deserialize and return a new copy of the message contained in this
OtpMsg.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#getRecipient()">getRecipient</A></B>()</CODE>
<BR>
Get the name of the recipient for this message, if it is a regSendTag
message.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#getRecipientName()">getRecipientName</A></B>()</CODE>
<BR>
Get the name of the recipient for this message.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../com/ericsson/otp/erlang/OtpErlangPid.html" title="class in com.ericsson.otp.erlang">OtpErlangPid</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#getRecipientPid()">getRecipientPid</A></B>()</CODE>
<BR>
Get the Pid of the recipient for this message, if it is a sendTag
message.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../com/ericsson/otp/erlang/OtpErlangPid.html" title="class in com.ericsson.otp.erlang">OtpErlangPid</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#getSenderPid()">getSenderPid</A></B>()</CODE>
<BR>
Get the Pid of the sender of this message.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#type()">type</A></B>()</CODE>
<BR>
Get the type marker from this message.</TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
</TR>
</TABLE>
<P>
<!-- ============ FIELD DETAIL =========== -->
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Field Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="linkTag"><!-- --></A><H3>
linkTag</H3>
<PRE>
public static final int <B>linkTag</B></PRE>
<DL>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#com.ericsson.otp.erlang.OtpMsg.linkTag">Constant Field Values</A></DL>
</DL>
<HR>
<A NAME="sendTag"><!-- --></A><H3>
sendTag</H3>
<PRE>
public static final int <B>sendTag</B></PRE>
<DL>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#com.ericsson.otp.erlang.OtpMsg.sendTag">Constant Field Values</A></DL>
</DL>
<HR>
<A NAME="exitTag"><!-- --></A><H3>
exitTag</H3>
<PRE>
public static final int <B>exitTag</B></PRE>
<DL>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#com.ericsson.otp.erlang.OtpMsg.exitTag">Constant Field Values</A></DL>
</DL>
<HR>
<A NAME="unlinkTag"><!-- --></A><H3>
unlinkTag</H3>
<PRE>
public static final int <B>unlinkTag</B></PRE>
<DL>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#com.ericsson.otp.erlang.OtpMsg.unlinkTag">Constant Field Values</A></DL>
</DL>
<HR>
<A NAME="regSendTag"><!-- --></A><H3>
regSendTag</H3>
<PRE>
public static final int <B>regSendTag</B></PRE>
<DL>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#com.ericsson.otp.erlang.OtpMsg.regSendTag">Constant Field Values</A></DL>
</DL>
<HR>
<A NAME="exit2Tag"><!-- --></A><H3>
exit2Tag</H3>
<PRE>
public static final int <B>exit2Tag</B></PRE>
<DL>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#com.ericsson.otp.erlang.OtpMsg.exit2Tag">Constant Field Values</A></DL>
</DL>
<HR>
<A NAME="tag"><!-- --></A><H3>
tag</H3>
<PRE>
protected int <B>tag</B></PRE>
<DL>
<DL>
</DL>
</DL>
<HR>
<A NAME="paybuf"><!-- --></A><H3>
paybuf</H3>
<PRE>
protected <A HREF="../../../../com/ericsson/otp/erlang/OtpInputStream.html" title="class in com.ericsson.otp.erlang">OtpInputStream</A> <B>paybuf</B></PRE>
<DL>
<DL>
</DL>
</DL>
<HR>
<A NAME="payload"><!-- --></A><H3>
payload</H3>
<PRE>
protected <A HREF="../../../../com/ericsson/otp/erlang/OtpErlangObject.html" title="class in com.ericsson.otp.erlang">OtpErlangObject</A> <B>payload</B></PRE>
<DL>
<DL>
</DL>
</DL>
<HR>
<A NAME="from"><!-- --></A><H3>
from</H3>
<PRE>
protected <A HREF="../../../../com/ericsson/otp/erlang/OtpErlangPid.html" title="class in com.ericsson.otp.erlang">OtpErlangPid</A> <B>from</B></PRE>
<DL>
<DL>
</DL>
</DL>
<HR>
<A NAME="to"><!-- --></A><H3>
to</H3>
<PRE>
protected <A HREF="../../../../com/ericsson/otp/erlang/OtpErlangPid.html" title="class in com.ericsson.otp.erlang">OtpErlangPid</A> <B>to</B></PRE>
<DL>
<DL>
</DL>
</DL>
<HR>
<A NAME="toName"><!-- --></A><H3>
toName</H3>
<PRE>
protected java.lang.String <B>toName</B></PRE>
<DL>
<DL>
</DL>
</DL>
<!-- ============ METHOD DETAIL ========== -->
<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Method Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="type()"><!-- --></A><H3>
type</H3>
<PRE>
public int <B>type</B>()</PRE>
<DL>
<DD><p>
Get the type marker from this message. The type marker identifies the
type of message. Valid values are the ``tag'' constants defined in this
class.
</p>
<p>
The tab identifies not only the type of message but also the content of
the OtpMsg object, since different messages have different components, as
follows:
</p>
<ul>
<li> sendTag identifies a "normal" message. The recipient is a
<A HREF="../../../../com/ericsson/otp/erlang/OtpErlangPid.html" title="class in com.ericsson.otp.erlang"><CODE>Pid</CODE></A> and it is available through <A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#getRecipientPid()"><CODE>getRecipientPid()</CODE></A>. Sender information is not available.
The message body can be retrieved with <A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#getMsg()"><CODE>getMsg()</CODE></A>. </li>
<li> regSendTag also identifies a "normal" message. The recipient here is
a String and it is available through <A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#getRecipientName()"><CODE>getRecipientName()</CODE></A>. Sender information is available through
#getSenderPid getSenderPid()}. The message body can be retrieved with
<A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#getMsg()"><CODE>getMsg()</CODE></A>. </li>
<li> linkTag identifies a link request. The Pid of the sender is
available, as well as the Pid to which the link should be made. </li>
<li> exitTag and exit2Tag messages are sent as a result of broken links.
Both sender and recipient Pids and are available through the
corresponding methods, and the "reason" is available through
<A HREF="../../../../com/ericsson/otp/erlang/OtpMsg.html#getMsg()"><CODE>getMsg()</CODE></A>. </li>
</ul>
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getMsg()"><!-- --></A><H3>
getMsg</H3>
<PRE>
public <A HREF="../../../../com/ericsson/otp/erlang/OtpErlangObject.html" title="class in com.ericsson.otp.erlang">OtpErlangObject</A> <B>getMsg</B>()
throws <A HREF="../../../../com/ericsson/otp/erlang/OtpErlangDecodeException.html" title="class in com.ericsson.otp.erlang">OtpErlangDecodeException</A></PRE>
<DL>
<DD><p>
Deserialize and return a new copy of the message contained in this
OtpMsg.
</p>
<p>
The first time this method is called the actual payload is deserialized
and the Erlang term is created. Calling this method subsequent times will
not cuase the message to be deserialized additional times, instead the
same Erlang term object will be returned.
</p>
<P>
<DD><DL>
<DT><B>Returns:</B><DD>an Erlang term.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../com/ericsson/otp/erlang/OtpErlangDecodeException.html" title="class in com.ericsson.otp.erlang">OtpErlangDecodeException</A></CODE> - if the byte stream could not be deserialized.</DL>
</DD>
</DL>
<HR>
<A NAME="getRecipientName()"><!-- --></A><H3>
getRecipientName</H3>
<PRE>
public java.lang.String <B>getRecipientName</B>()</PRE>
<DL>
<DD><p>
Get the name of the recipient for this message.
</p>
<p>
Messages are sent to Pids or names. If this message was sent to a name
then the name is returned by this method.
</p>
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the name of the recipient, or null if the recipient was in fact a
Pid.</DL>
</DD>
</DL>
<HR>
<A NAME="getRecipientPid()"><!-- --></A><H3>
getRecipientPid</H3>
<PRE>
public <A HREF="../../../../com/ericsson/otp/erlang/OtpErlangPid.html" title="class in com.ericsson.otp.erlang">OtpErlangPid</A> <B>getRecipientPid</B>()</PRE>
<DL>
<DD><p>
Get the Pid of the recipient for this message, if it is a sendTag
message.
</p>
<p>
Messages are sent to Pids or names. If this message was sent to a Pid
then the Pid is returned by this method. The recipient Pid is also
available for link, unlink and exit messages.
</p>
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the Pid of the recipient, or null if the recipient was in fact a
name.</DL>
</DD>
</DL>
<HR>
<A NAME="getRecipient()"><!-- --></A><H3>
getRecipient</H3>
<PRE>
public java.lang.Object <B>getRecipient</B>()</PRE>
<DL>
<DD><p>
Get the name of the recipient for this message, if it is a regSendTag
message.
</p>
<p>
Messages are sent to Pids or names. If this message was sent to a name
then the name is returned by this method.
</p>
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the Pid of the recipient, or null if the recipient was in fact a
name.</DL>
</DD>
</DL>
<HR>
<A NAME="getSenderPid()"><!-- --></A><H3>
getSenderPid</H3>
<PRE>
public <A HREF="../../../../com/ericsson/otp/erlang/OtpErlangPid.html" title="class in com.ericsson.otp.erlang">OtpErlangPid</A> <B>getSenderPid</B>()</PRE>
<DL>
<DD><p>
Get the Pid of the sender of this message.
</p>
<p>
For messages sent to names, the Pid of the sender is included with the
message. The sender Pid is also available for link, unlink and exit
messages. It is not available for sendTag messages sent to Pids.
</p>
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the Pid of the sender, or null if it was not available.</DL>
</DD>
</DL>
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