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| <H1 ALIGN=CENTER STYLE="margin-top: 0cm; text-decoration: none"><A HREF="http://www.openoffice.org/"><IMG SRC="../../images/open_office_org_logo.gif" NAME="Grafik1" ALT="OpenOffice" ALIGN=RIGHT WIDTH=109 HEIGHT=54 BORDER=0></A><font color="#ffffff" size=6>The |
| life cycle of Java components</font><FONT COLOR="#ffffff"></FONT></H1> |
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| <H3 ALIGN=LEFT STYLE="margin-top: 0cm; text-decoration: none"><FONT COLOR="#ffffff"><FONT SIZE=4>Contents</FONT></FONT></H3> |
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| <p><a href="#Introduction">Introduction</a><br> |
| <a href="#CPlusPlusToJava">C++ object mapped to Java</a><br> |
| <a href="#JavaToCPlusPlus">Java object mapped to C++</a></p> |
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| <H3 ALIGN=LEFT STYLE="margin-top: 0cm; text-decoration: none"><FONT COLOR="#ffffff"><font color="#ffffff"><font size=4><a name="Introduction"></a><font color="#ffffff"></font></font></font><FONT SIZE=4>Introduction</FONT></FONT></H3> |
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| <p>In Java, objects live as long as they are reachable by a thread. In UNO, |
| objects have a reference count and live as long as the reference count |
| is greater than zero. When using pure Java UNO, the normal Java life cycle |
| mechanism applies. When using Java UNO in cooperation with e.g. binary |
| UNO, objects live as long as their reference count is not zero.</p> |
| <p>In the following the life cycle of Java and C++ objects are described.</p> |
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| <h3 align=LEFT style="margin-top: 0cm; text-decoration: none"><font color="#ffffff"><font size=4><a name="CPlusPlusToJava"></a>C++ |
| object mapped to Java</font></font></h3> |
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| <p>If a C++ object is mapped to Java, it lives as long as it is reachable |
| from a Java thread. That is to say that the life cycle of a C++ object |
| mapped to Java corresponds to the Java life cycle mechanism as normal. |
| <p>An Object is created to cope with a certain work. In Java, once an object |
| has completed its work, it is garbage-collected and its resources are |
| recycled for use by other objects. Now, such an object is unreachable |
| from a Java thread. |
| <p><img src="images/LifeCycleOfObjects.jpg" width="727" height="415" alt="Life cycle of objects"> |
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| <h3 align=LEFT style="margin-top: 0cm; text-decoration: none"><font color="#ffffff"><font size=4><a name="JavaToCPlusPlus"></a>Java |
| object mapped to C++</font></font></h3> |
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| <p>If a Java object is mapped to C++, the Java object lives as long as there |
| is a C++ reference. That is to say that the life cycle of a Java object |
| mapped to C++ corresponds to the C++ life cycle mechanism as normal. |
| <p>You can find further information to the life cycle of objects on the |
| following page:<br> |
| <a href="http://udk.openoffice.org/project/udk/common/man/comparison_uno_corba.html#life_time_mechanism">http://udk.openoffice.org/project/udk/common/man/comparison_uno_corba.html#life_time_mechanism</a> |
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| <P> </P> |
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| <P ALIGN=LEFT><FONT COLOR="#ffffff"> Author: <A HREF="mailto:Bertram.Nolte@germany.sun.com"><FONT COLOR="#ffffff">Bertram |
| Nolte</FONT></A>, <a href="mailto:Kay.Ramme@germany.sun.com">Kay Ramme</a> |
| (Mon 18 Jun 2001 11:54:14)<BR> |
| <I>Copyright 2001 Sun Microsystems, Inc., 901 San Antonio Road, Palo Alto, CA 94303 USA.</I></FONT> |
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