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NetRexxEngine (Bean Scripting Framework API)
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SUMMARY: NESTED | <A HREF="#fields_inherited_from_class_org.apache.bsf.util.BSFEngineImpl">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD>
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org.apache.bsf.engines.netrexx</FONT>
<BR>
Class NetRexxEngine</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html" title="class in org.apache.bsf.util">org.apache.bsf.util.BSFEngineImpl</A>
<IMG SRC="../../../../../resources/inherit.gif" ALT="extended by"><B>org.apache.bsf.engines.netrexx.NetRexxEngine</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../../org/apache/bsf/BSFEngine.html" title="interface in org.apache.bsf">BSFEngine</A>, java.util.EventListener, java.beans.PropertyChangeListener</DD>
</DL>
<HR>
<DL>
<DT>public class <B>NetRexxEngine</B><DT>extends <A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html" title="class in org.apache.bsf.util">BSFEngineImpl</A></DL>
<P>
This is the interface to NetRexx from the
Bean Scripting Framework.
<p>
The NetRexx code must be written script-style, without a "class" or
"properties" section preceeding the executable code. The NetRexxEngine will
generate a prefix for this code:
<pre>
<code>
class $$CLASSNAME$$;
method BSFNetRexxEngineEntry(bsf=org.apache.bsf.BSFManager) public static;
</code>
</pre>
$$CLASSNAME$$ will be replaced by a generated classname of the form
BSFNetRexx*, and the bsf parameter can be used to retrieve application
objects registered with the Bean Scripting Framework.
<p>
If you use the placeholder string $$CLASSNAME$$ elsewhere
in your script -- including within text strings -- BSFNetRexxEngine will
replace it with the generated name of the class before the NetRexx code
is compiled.
<p>
If you need to use full NetRexx functionality, we recommend that your
NetRexx script define and invoke a "minor class", with or without the
"dependent" keyword as suits your needs. You'll have to use $$CLASSNAME$$
in naming the minor class, since the name of the main class is synthesized;
for example, to create the minor class "bar" you'd write
"class $$CLASSNAME$$.Bar".
<p>
<h2>Hazards:</h2>
<p>
Since NetRexx has to be _compiled_ to a Java classfile, invoking it involves
a fair amount of computation to load and execute the compiler. We are
currently making an attempt to manage that by caching the class
after it has been loaded, but the indexing is fairly primitive; we
hash against the script string to find the class for it.
<p>
Minor-class .class files are now being deleted after the major class loads.
This coould potentially cause problems.
<P>
<P>
<DL>
<DT><B>Author:</B></DT>
<DD>Joe Kesselman, Sanjiva Weerawarana</DD>
</DL>
<HR>
<P>
<!-- ======== NESTED CLASS SUMMARY ======== -->
<!-- =========== FIELD SUMMARY =========== -->
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<B>Field Summary</B></FONT></TD>
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<A NAME="fields_inherited_from_class_org.apache.bsf.util.BSFEngineImpl"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Fields inherited from class org.apache.bsf.util.<A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html" title="class in org.apache.bsf.util">BSFEngineImpl</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html#classLoader">classLoader</A>, <A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html#classPath">classPath</A>, <A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html#declaredBeans">declaredBeans</A>, <A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html#lang">lang</A>, <A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html#mgr">mgr</A>, <A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html#tempDir">tempDir</A></CODE></TD>
</TR>
</TABLE>
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
<A NAME="constructor_summary"><!-- --></A>
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=2><FONT SIZE="+2">
<B>Constructor Summary</B></FONT></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../../org/apache/bsf/engines/netrexx/NetRexxEngine.html#NetRexxEngine()">NetRexxEngine</A></B>()</CODE>
<BR>
Constructor.</TD>
</TR>
</TABLE>
<!-- ========== METHOD SUMMARY =========== -->
<A NAME="method_summary"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TD COLSPAN=2><FONT SIZE="+2">
<B>Method Summary</B></FONT></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="../../../../../org/apache/bsf/engines/netrexx/NetRexxEngine.html#call(java.lang.Object, java.lang.String, java.lang.Object[])">call</A></B>(java.lang.Object object,
java.lang.String method,
java.lang.Object[] args)</CODE>
<BR>
Return an object from an extension.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/bsf/engines/netrexx/NetRexxEngine.html#declareBean(org.apache.bsf.BSFDeclaredBean)">declareBean</A></B>(<A HREF="../../../../../org/apache/bsf/BSFDeclaredBean.html" title="class in org.apache.bsf">BSFDeclaredBean</A> bean)</CODE>
<BR>
Declare a bean after the engine has been started.</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="../../../../../org/apache/bsf/engines/netrexx/NetRexxEngine.html#eval(java.lang.String, int, int, java.lang.Object)">eval</A></B>(java.lang.String source,
int lineNo,
int columnNo,
java.lang.Object script)</CODE>
<BR>
Override impl of execute.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/bsf/engines/netrexx/NetRexxEngine.html#exec(java.lang.String, int, int, java.lang.Object)">exec</A></B>(java.lang.String source,
int lineNo,
int columnNo,
java.lang.Object script)</CODE>
<BR>
Override impl of execute.</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="../../../../../org/apache/bsf/engines/netrexx/NetRexxEngine.html#execEvalShared(java.lang.String, int, int, java.lang.Object, boolean)">execEvalShared</A></B>(java.lang.String source,
int lineNo,
int columnNo,
java.lang.Object oscript,
boolean returnsObject)</CODE>
<BR>
This is shared code for the exec() and eval() operations.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/bsf/engines/netrexx/NetRexxEngine.html#initialize(org.apache.bsf.BSFManager, java.lang.String, java.util.Vector)">initialize</A></B>(<A HREF="../../../../../org/apache/bsf/BSFManager.html" title="class in org.apache.bsf">BSFManager</A> mgr,
java.lang.String lang,
java.util.Vector declaredBeans)</CODE>
<BR>
initialize the engine; called right after construction by
the manager.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/bsf/engines/netrexx/NetRexxEngine.html#undeclareBean(org.apache.bsf.BSFDeclaredBean)">undeclareBean</A></B>(<A HREF="../../../../../org/apache/bsf/BSFDeclaredBean.html" title="class in org.apache.bsf">BSFDeclaredBean</A> bean)</CODE>
<BR>
Undeclare a previously declared bean.</TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_org.apache.bsf.util.BSFEngineImpl"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Methods inherited from class org.apache.bsf.util.<A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html" title="class in org.apache.bsf.util">BSFEngineImpl</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html#apply(java.lang.String, int, int, java.lang.Object, java.util.Vector, java.util.Vector)">apply</A>, <A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html#compileApply(java.lang.String, int, int, java.lang.Object, java.util.Vector, java.util.Vector, org.apache.bsf.util.CodeBuffer)">compileApply</A>, <A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html#compileExpr(java.lang.String, int, int, java.lang.Object, org.apache.bsf.util.CodeBuffer)">compileExpr</A>, <A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html#compileScript(java.lang.String, int, int, java.lang.Object, org.apache.bsf.util.CodeBuffer)">compileScript</A>, <A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html#iexec(java.lang.String, int, int, java.lang.Object)">iexec</A>, <A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html#propertyChange(java.beans.PropertyChangeEvent)">propertyChange</A>, <A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html#terminate()">terminate</A></CODE></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">
<TD><B>Methods inherited from class java.lang.Object</B></TD>
</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 =========== -->
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<A NAME="constructor_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=1><FONT SIZE="+2">
<B>Constructor Detail</B></FONT></TD>
</TR>
</TABLE>
<A NAME="NetRexxEngine()"><!-- --></A><H3>
NetRexxEngine</H3>
<PRE>
public <B>NetRexxEngine</B>()</PRE>
<DL>
<DD>Constructor.
<P>
</DL>
<!-- ============ METHOD DETAIL ========== -->
<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=1><FONT SIZE="+2">
<B>Method Detail</B></FONT></TD>
</TR>
</TABLE>
<A NAME="call(java.lang.Object, java.lang.String, java.lang.Object[])"><!-- --></A><H3>
call</H3>
<PRE>
public java.lang.Object <B>call</B>(java.lang.Object object,
java.lang.String method,
java.lang.Object[] args)
throws <A HREF="../../../../../org/apache/bsf/BSFException.html" title="class in org.apache.bsf">BSFException</A></PRE>
<DL>
<DD>Return an object from an extension.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>object</CODE> - object from which to call our static method<DD><CODE>method</CODE> - The name of the method to call.<DD><CODE>args</CODE> - an array of arguments to be
passed to the extension, which may be either
Vectors of Nodes, or Strings.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../org/apache/bsf/BSFException.html" title="class in org.apache.bsf">BSFException</A></CODE> - if anything goes wrong while eval'ing a
BSFException is thrown. The reason indicates the problem.</DL>
</DD>
</DL>
<HR>
<A NAME="declareBean(org.apache.bsf.BSFDeclaredBean)"><!-- --></A><H3>
declareBean</H3>
<PRE>
public void <B>declareBean</B>(<A HREF="../../../../../org/apache/bsf/BSFDeclaredBean.html" title="class in org.apache.bsf">BSFDeclaredBean</A> bean)
throws <A HREF="../../../../../org/apache/bsf/BSFException.html" title="class in org.apache.bsf">BSFException</A></PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../../org/apache/bsf/BSFEngine.html" title="interface in org.apache.bsf">BSFEngine</A></CODE></B></DD>
<DD>Declare a bean after the engine has been started. Declared beans
are beans that are named and which the engine must make available
to the scripts it runs in the most first class way possible.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/bsf/BSFEngine.html#declareBean(org.apache.bsf.BSFDeclaredBean)">declareBean</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/bsf/BSFEngine.html" title="interface in org.apache.bsf">BSFEngine</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html#declareBean(org.apache.bsf.BSFDeclaredBean)">declareBean</A></CODE> in class <CODE><A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html" title="class in org.apache.bsf.util">BSFEngineImpl</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../org/apache/bsf/BSFException.html" title="class in org.apache.bsf">BSFException</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="eval(java.lang.String, int, int, java.lang.Object)"><!-- --></A><H3>
eval</H3>
<PRE>
public java.lang.Object <B>eval</B>(java.lang.String source,
int lineNo,
int columnNo,
java.lang.Object script)
throws <A HREF="../../../../../org/apache/bsf/BSFException.html" title="class in org.apache.bsf">BSFException</A></PRE>
<DL>
<DD>Override impl of execute. In NetRexx, methods which do not wish
to return a value should be invoked via exec, which will cause them
to be generated without the "returns" clause.
Those which wish to return a value should call eval instead.
which will add "returns java.lang.Object" to the header.
Note: It would be nice to have the "real" return type avaialable, so
we could do something more type-safe than Object, and so we could
return primitive types without having to enclose them in their
object wrappers. BSF does not currently support that concept.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>source</CODE> - (context info) the source of this expression
(e.g., filename)<DD><CODE>lineNo</CODE> - (context info) the line number in source for expr<DD><CODE>columnNo</CODE> - (context info) the column number in source for expr<DD><CODE>script</CODE> - the expression to evaluate
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../org/apache/bsf/BSFException.html" title="class in org.apache.bsf">BSFException</A></CODE> - if anything goes wrong while eval'ing a
BSFException is thrown. The reason indicates the problem.</DL>
</DD>
</DL>
<HR>
<A NAME="exec(java.lang.String, int, int, java.lang.Object)"><!-- --></A><H3>
exec</H3>
<PRE>
public void <B>exec</B>(java.lang.String source,
int lineNo,
int columnNo,
java.lang.Object script)
throws <A HREF="../../../../../org/apache/bsf/BSFException.html" title="class in org.apache.bsf">BSFException</A></PRE>
<DL>
<DD>Override impl of execute. In NetRexx, methods which do not wish
to return a value should be invoked via exec, which will cause them
to be generated without the "returns" clause.
Those which wish to return a value should call eval instead.
which will add "returns java.lang.Object" to the header.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/bsf/BSFEngine.html#exec(java.lang.String, int, int, java.lang.Object)">exec</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/bsf/BSFEngine.html" title="interface in org.apache.bsf">BSFEngine</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html#exec(java.lang.String, int, int, java.lang.Object)">exec</A></CODE> in class <CODE><A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html" title="class in org.apache.bsf.util">BSFEngineImpl</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../org/apache/bsf/BSFException.html" title="class in org.apache.bsf">BSFException</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="execEvalShared(java.lang.String, int, int, java.lang.Object, boolean)"><!-- --></A><H3>
execEvalShared</H3>
<PRE>
public java.lang.Object <B>execEvalShared</B>(java.lang.String source,
int lineNo,
int columnNo,
java.lang.Object oscript,
boolean returnsObject)
throws <A HREF="../../../../../org/apache/bsf/BSFException.html" title="class in org.apache.bsf">BSFException</A></PRE>
<DL>
<DD>This is shared code for the exec() and eval() operations. It will
evaluate a string containing a NetRexx method body -- which may be
as simple as a single return statement.
It should store the "bsf" handle where the
script can get to it, for callback purposes.
<p>
Note that NetRexx compilation imposes serious overhead -- 11 seconds for
the first compile, about 3 thereafter -- but in exchange you get
Java-like speeds once the classes have been created (minus the cache
lookup cost).
<p>
Nobody knows whether javac is threadsafe.
I'm going to serialize access to the compilers to protect it.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../org/apache/bsf/BSFException.html" title="class in org.apache.bsf">BSFException</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="initialize(org.apache.bsf.BSFManager, java.lang.String, java.util.Vector)"><!-- --></A><H3>
initialize</H3>
<PRE>
public void <B>initialize</B>(<A HREF="../../../../../org/apache/bsf/BSFManager.html" title="class in org.apache.bsf">BSFManager</A> mgr,
java.lang.String lang,
java.util.Vector declaredBeans)
throws <A HREF="../../../../../org/apache/bsf/BSFException.html" title="class in org.apache.bsf">BSFException</A></PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html" title="class in org.apache.bsf.util">BSFEngineImpl</A></CODE></B></DD>
<DD>initialize the engine; called right after construction by
the manager. Declared beans are simply kept in a vector and
that's it. Subclasses must do whatever they want with it.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/bsf/BSFEngine.html#initialize(org.apache.bsf.BSFManager, java.lang.String, java.util.Vector)">initialize</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/bsf/BSFEngine.html" title="interface in org.apache.bsf">BSFEngine</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html#initialize(org.apache.bsf.BSFManager, java.lang.String, java.util.Vector)">initialize</A></CODE> in class <CODE><A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html" title="class in org.apache.bsf.util">BSFEngineImpl</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../org/apache/bsf/BSFException.html" title="class in org.apache.bsf">BSFException</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="undeclareBean(org.apache.bsf.BSFDeclaredBean)"><!-- --></A><H3>
undeclareBean</H3>
<PRE>
public void <B>undeclareBean</B>(<A HREF="../../../../../org/apache/bsf/BSFDeclaredBean.html" title="class in org.apache.bsf">BSFDeclaredBean</A> bean)
throws <A HREF="../../../../../org/apache/bsf/BSFException.html" title="class in org.apache.bsf">BSFException</A></PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../../org/apache/bsf/BSFEngine.html" title="interface in org.apache.bsf">BSFEngine</A></CODE></B></DD>
<DD>Undeclare a previously declared bean.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/bsf/BSFEngine.html#undeclareBean(org.apache.bsf.BSFDeclaredBean)">undeclareBean</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/bsf/BSFEngine.html" title="interface in org.apache.bsf">BSFEngine</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html#undeclareBean(org.apache.bsf.BSFDeclaredBean)">undeclareBean</A></CODE> in class <CODE><A HREF="../../../../../org/apache/bsf/util/BSFEngineImpl.html" title="class in org.apache.bsf.util">BSFEngineImpl</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../org/apache/bsf/BSFException.html" title="class in org.apache.bsf">BSFException</A></CODE></DL>
</DD>
</DL>
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