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| <title>Load-time Weaving Requirements</title><link rel="stylesheet" href="aspectj-docs.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.44"><link rel="home" href="index.html" title="The AspectJtm Development Environment Guide"><link rel="up" href="ltw.html" title="Chapter 5. Load-Time Weaving"><link rel="previous" href="ltw.html" title="Chapter 5. Load-Time Weaving"><link rel="next" href="ltw-configuration.html" title="Configuration"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Load-time Weaving Requirements</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ltw.html">Prev</a> </td><th width="60%" align="center">Chapter 5. Load-Time Weaving</th><td width="20%" align="right"> <a accesskey="n" href="ltw-configuration.html">Next</a></td></tr></table><hr></div><div class="sect1"><a name="ltw-rules"></a><div class="titlepage"><div><h2 class="title" style="clear: both"><a name="ltw-rules"></a>Load-time Weaving Requirements</h2></div></div><p> All load-time weaving is done in the context of a class loader, and hence the set of | |
| aspects used for weaving and the types that can be woven are affected by the class | |
| loader delegation model. This ensures that LTW complies with the Java 2 security model. | |
| The following rules govern the interaction of load-time weaving with class loading: </p><div class="orderedlist"><ol type="1"><li><p><a name="d0e2768"></a>All aspects to be used for weaving must be defined to the weaver before any | |
| types to be woven are loaded. This avoids types being "missed" by aspects added | |
| later, with the result that invariants across types fail.</p></li><li><p><a name="d0e2771"></a>All aspects visible to the weaver are usable. | |
| A visible aspect is one defined by the | |
| weaving class loader or one of its parent class loaders. | |
| All concrete visible aspects are woven and all abstract visible aspects | |
| may be extended. | |
| </p></li><li><p><a name="d0e2774"></a>A class loader may only weave classes that it defines. It may not weave | |
| classes loaded by a delegate or parent class loader.</p></li></ol></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ltw.html">Prev</a> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right"> <a accesskey="n" href="ltw-configuration.html">Next</a></td></tr><tr><td width="40%" align="left">Chapter 5. Load-Time Weaving </td><td width="20%" align="center"><a accesskey="u" href="ltw.html">Up</a></td><td width="40%" align="right"> Configuration</td></tr></table></div></body></html> |