/* (non-Javadoc)
* @see javassist.Translator#onWrite(javassist.ClassPool, java.lang.String)
*/
public void onWrite(ClassPool pool, String classname)
throws NotFoundException, CannotCompileException {
// LOG.info(++logCounter+" Searching component for "+classname+" in repository with #cop =
// "+ComponentRepository.Instance().getComponentResources().size());
// COMPONENT MUST HAVE BEEN PUT IN REPOSITORY MAP ALREADY (before initComponent())
IComponentResource loadingCop =
UpgradeableComponentResourceFactory.getComponentResourceByContent(classname);
/* DEBUGGING ONLY: check if have to load from dependency: // MUST NOT happen: load from wrong cop!!!
if (loadingCop == null) {
LOG.error(cp+" "+v+": class "+classname+" belongs to no cop ");
return;
} else if( !((UpgradeableComponentResource)loadingCop).contains(classname)) {
// wrong cop: hack , check for loadingCop.knowsClass(classname) instead
LOG.error(cp+" "+v+": class "+classname+" belongs not to cop "+loadingCop);
return;
}*/
String cb = ProxyComponentResourceFactory.getProxyCodebase(loadingCop);
IComponentResource proxyCop = ComponentRepository.Instance().getComponentResourceByCodebase(cb);
if (proxyCop instanceof ProxyComponentResource) {
// during an upgrade, check if current version of cop was retreived
loadingCop = ((ProxyComponentResource) proxyCop).getOriginalComponent();
}
// LOG.info(loadingCop+", "+loadingCop.getVersion()+": pool.get("+classname+")");
// if (loadingCop instanceof ProxyComponentResource) return;
int extRefCount = searchExternalReferences(classname, pool, loadingCop);
if (extRefCount == 0) return;
CtClass toManipulate = pool.get(classname);
manipulate(classname, toManipulate, extRefCount);
}
/**
* looks for classes that are referenced within the code of the class named <code>classname</code>
* that do neither belong to system classes nor to the same component as the class searched. Any
* external reference found must belong to a dependency component of the component of the class
* being searched. For each occurrence of such an external reference, <code>foundExternalReference
* </code> is invoked.
*
* @param classname
* @param pool
* @param loadingCop
* @return
*/
protected int searchExternalReferences(
String classname, ClassPool pool, IComponentResource loadingCop) {
// LOG.info(logCounter+" found it ... in pool
// "+loadingCop.getExtResLocation() + loadingCop.getCodeBase());
// search for external references in code of class "className" using CtClass.getRefClasses() and
// create an externalPool for each cop in dependencies
CtClass toSearch = null;
try {
// LOG.info(cp+" "+v+": searching for external references in "+classname);
toSearch = pool.get(classname);
CtClass[] ifcs = toSearch.getInterfaces();
CtClass superClass = toSearch.getSuperclass();
} catch (IllegalStateException e) {
LOG.error("Zipfile is not open", e);
} catch (NotFoundException e) {
LOG.error(
"javassist.NotFoundException: class " + classname + " not found in " + cp + " " + v);
throw new RuntimeException(); // loadClassBytes fails -> loadFromDep
}
Vector externalClasses = new Vector();
Iterator referencedClasses = toSearch.getRefClasses().iterator();
int extRefCount = 0;
while (referencedClasses.hasNext()) {
String toWrap = (String) referencedClasses.next();
IComponentResource dependencyCop;
Object cached = class2cop.get(toSearch.getName());
if (cached instanceof UpgradeableComponentResource) {
dependencyCop = (UpgradeableComponentResource) cached;
} else {
dependencyCop = UpgradeableComponentResourceFactory.getComponentResourceByContent(toWrap);
}
if ((dependencyCop instanceof UpgradeableComponentResource)
&& (!loadingCop
.getCodeBase()
.equals(
dependencyCop
.getCodeBase()))) { // compare jar names (different versions are considered
// equal: java.** and internal Classes seems to be
// external of new cop version (found inside old cop
// version))
// a dependency that may be uncoupled has been found
// dependency is ignored if the dependency class is already hidden behind a proxy
// or the dependency class may be in use already or the dependency class lies in a previous
// version of the loading cop
// LOG.info("Found dependency to external class "+toWrap+" in cop "+dependencyCop+" while
// loading class "+toSearch.getName()+" in cop "+loadingCop);
foundExternalReference(loadingCop, toWrap, (UpgradeableComponentResource) dependencyCop);
extRefCount++;
} else {
// if (dependencyCop == null) LOG.error("Nullpointer, dependencyCop is null (system
// class?)");
// else if (dependencyCop != loadingCop) LOG.info("dependency is NOT evolvable
// "+dependencyCop.getCodeBase()+" : "+dependencyCop.getClass().getName());
}
}
// LOG.info(logCounter+" onWrite: Found "+extRefCount+" external reference(s) in
// "+loadingCop.getCodeBase()+"."+classname);
return extRefCount;
}
