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JCoContext (JCo API 3.0)
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com.sap.conn.jco</FONT>
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Class JCoContext</H2>
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java.lang.Object
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.sap.conn.jco.JCoContext</B>
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<DT><PRE>public abstract class <B>JCoContext</B><DT>extends java.lang.Object</DL>
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<P>
JCoContext class allows execution of stateful function calls with JCo. It provides methods to notify the JCo Runtime about start and end of the stateful call sequence on all or a specific destination. Between start() and end() the same connection will be used for all function calls.<br> In case an error occurred during the communication and the connection was broken or closed, the application should take care about such situation. Depending on the application it could be necessary to repeat all function calls. <pre> JCoDestination destination = JCoDestinationManager.getDestination("<destination>"); try { JCoContext.begin(destination); function.execute(destination) function.execute(destination) } catch (AbapException ex) { ... } catch (JCoException ex) { ... } catch (Exception ex) { ... } finally { JCoContext.end(destination); } </pre> Internally JCo Runtime consider all calls executed in the current thread between begin() and end() as coherent and sends the calls over the same connection. Applications, which can change the thread during a stateful call sequence or execute some different stateful call sequences from the same thread alternately, have to provide a custom implementation for SessionReferenceProvider.
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<DT><B>See Also:</B><DD><A HREF="../../../../com/sap/conn/jco/ext/SessionReferenceProvider.html" title="interface in com.sap.conn.jco.ext"><CODE>SessionReferenceProvider</CODE></A></DL>
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<TD><CODE><B><A HREF="../../../../com/sap/conn/jco/JCoContext.html#JCoContext()">JCoContext</A></B>()</CODE>
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<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sap/conn/jco/JCoContext.html#begin(com.sap.conn.jco.JCoDestination)">begin</A></B>(<A HREF="../../../../com/sap/conn/jco/JCoDestination.html" title="interface in com.sap.conn.jco">JCoDestination</A> destination)</CODE>
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Begins the stateful call sequence for calls to the specified destination.</TD>
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<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sap/conn/jco/JCoContext.html#end(com.sap.conn.jco.JCoDestination)">end</A></B>(<A HREF="../../../../com/sap/conn/jco/JCoDestination.html" title="interface in com.sap.conn.jco">JCoDestination</A> destination)</CODE>
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Ends a stateful call sequence for calls to the specified destination.</TD>
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<CODE>static boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sap/conn/jco/JCoContext.html#isStateful(com.sap.conn.jco.JCoDestination)">isStateful</A></B>(<A HREF="../../../../com/sap/conn/jco/JCoDestination.html" title="interface in com.sap.conn.jco">JCoDestination</A> destination)</CODE>
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Returns true if in the current session the stateful sequence was started, i.e. begin() was invoked and not finished by end().</TD>
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<TD><CODE>equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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<A NAME="JCoContext()"><!-- --></A><H3>
JCoContext</H3>
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public <B>JCoContext</B>()</PRE>
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<A NAME="begin(com.sap.conn.jco.JCoDestination)"><!-- --></A><H3>
begin</H3>
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public static void <B>begin</B>(<A HREF="../../../../com/sap/conn/jco/JCoDestination.html" title="interface in com.sap.conn.jco">JCoDestination</A> destination)</PRE>
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<DD>Begins the stateful call sequence for calls to the specified destination. The connections used between <code>begin(JCoDestination)</code> and <code>end(JCoDestination)</code> won't be reset or closed.
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<A NAME="end(com.sap.conn.jco.JCoDestination)"><!-- --></A><H3>
end</H3>
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public static void <B>end</B>(<A HREF="../../../../com/sap/conn/jco/JCoDestination.html" title="interface in com.sap.conn.jco">JCoDestination</A> destination)
throws <A HREF="../../../../com/sap/conn/jco/JCoException.html" title="class in com.sap.conn.jco">JCoException</A></PRE>
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<DD>Ends a stateful call sequence for calls to the specified destination. A blocked connection is now returned for reuse to a pool or is at least no longer guaranteed to be kept open.
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<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../com/sap/conn/jco/JCoException.html" title="class in com.sap.conn.jco">JCoException</A></CODE></DL>
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<A NAME="isStateful(com.sap.conn.jco.JCoDestination)"><!-- --></A><H3>
isStateful</H3>
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public static boolean <B>isStateful</B>(<A HREF="../../../../com/sap/conn/jco/JCoDestination.html" title="interface in com.sap.conn.jco">JCoDestination</A> destination)</PRE>
<DL>
<DD>Returns true if in the current session the stateful sequence was started, i.e. begin() was invoked and not finished by end(). Returns false otherwise.
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<DT><B>Parameters:</B><DD><CODE>destination</CODE> - for which the stateful flag will be checked
<DT><B>Returns:</B><DD>flag describes the state of the destination</DL>
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