VISUALVM OQL: Rechercher un objet qui a (indirect) jetonuables / références à deux identifiants d'objet?
Question
Ma question est plutôt courte et compacte:
Si je trouve deux objets avec VisualVM, quel type de requête OQL puis-je effectuer pour trouver tous les objets qui ont (indirectement) jetonuables ou références à ces deux objets?
Mise à jour pour JB:
Après avoir édité votre code, je suis proposé ce qui suit:
//QUERY SCRIPT: find object that (indirectly) references to all target objects
//list all objects that the objects we search for should (indirectly) refer to
var targetObjects = [ heap.findObject("811819664"), //eg. obj that contains a player's health
heap.findObject("811820024") //eg. obj that contains the same player's name
];
//list all objects here that every or most objects have as an indirect referer (eg. base class loaders)
var ignoreReferers = []; //eg. [heap.findObject("ignId1")];
//set array with all elements that refer to each target object
var targetObjectsReferers = [];
for (var tarObjIndex in targetObjects) {
var targetObjRefElements = [];
//get the live path of this target object
var livePaths = heap.livepaths(targetObjects[tarObjIndex]);
//cleanup every live path
for (var livePathsIndex in livePaths) {
var curLivePath = livePaths[livePathsIndex];
if ((curLivePath == null) || (curLivePath == "undefined")) continue;
//remove last element from live path as it is the actual object
curLivePath.pop();
//remove elements that equal an ignore referer object
for (var pathElementIndex in curLivePath) {
if ((curLivePath[pathElementIndex] == null) || (curLivePath[pathElementIndex] == "undefined")) continue;
for (var ignoreIndex in ignoreReferers) {
if (identical(curLivePath[pathElementIndex], ignoreReferers[ignoreIndex])) curLivePath.splice(pathElementIndex, 1); //FIXME: this might fail if index is not updated
}
}
}
//merge remaining life paths elements into targetObjRefElements
for (var livePathsIndex in livePaths) {
var curLivePath = livePaths[livePathsIndex];
for (var curLivePathIndex in curLivePath) {
targetObjRefElements.push(curLivePath[curLivePathIndex]);
}
}
//remove duplicate referers
targetObjRefElements = unique(targetObjRefElements, 'objectid(it)');
//add to target objects referers
targetObjectsReferers.push(targetObjRefElements);
}
//filter and return
filter(targetObjectsReferers[0], function(it1) {
var rslt = contains(targetObjectsReferers[1], function(it2) { //FIXME: this limits it to 2 objects!
return identical(it1, it2);
});
return rslt;
});
Ceci renvoie une erreur POP n'est pas définie d'erreur après un certain temps, ce que j'essaie de résoudre.Si je parvienne à résoudre que je puisse voir s'il fournit les résultats escomptés.
La solution
It sounds like you are trying to get all reference chains keeping your objects alive. You can use heap.livepaths(object) function to obtain them. You can take some hints from the following code
var paths1 = heap.livepaths(heap.findObject("1684177040")) // use the objectid of the first instance
var paths2 = heap.livepaths(heap.findObject("1684177160")) // use the objectid of the second instance
var pathArr1 = unique(rcs2array(paths1), 'objectid(it)') // flatten all the livepaths to a single array of instances
var pathArr2 = unique(rcs2array(paths2), 'objectid(it)') // the same for the second instance
// calculate the arrays' intersection - the result is the set of object keeping both of your instances alive
filter(pathArr1, function(it1) {
var rslt = contains(pathArr2, function(it2) {
return (objectid(it1) == objectid(it2))
})
return rslt
})
// helper function to convert an array of reference chains to a flat array of objects
function rcs2array(rcs) {
var arr = new Array()
for(var i=0;i<rcs.length;i++) {
var rc = rcs[i];
for(var j=0;j<rc.length;j++) {
arr.push(rc[j])
}
}
return arr
}
Please, bear in mind that this works only in VisualVM and jhat