I find required objects in visualvm v1.3.8:
filter(heap.objects("java.lang.String"), "/hibernate\\.ejb\\.naming/(it.toString())")
they shown as:
java.lang.String#32669 - hibernate.ejb.naming_strategy_delegator
java.lang.String#34021 - hibernate.ejb.naming_strategy
java.lang.String#39522 - hibernate.ejb.naming_strategy_delegator
How can I refer to individual object from result set in OQL syntax? My attempts fail:
select heap.findObject("java.lang.String#34021")
select heap.findObject("#34021")
select heap.findObject("34021")
I may use trick with objectid(...):
map(filter(heap.objects("java.lang.String"),
"/hibernate\\.ejb\\.naming/.test(it.toString())"),
"{id: objectid(it), ref: it}")
and then reuse id with heap.findObject(4077522088) like syntax.
UPDATE 2022 Seems VisualVM enumerates each type separately and consistently so iteration of heap.objects("...", false) should lead to the right object:
function objectnum(clazz, num) {
if (typeof clazz !== 'string') { return undefined; }
if (Math.floor(num) !== num) {
var split = clazz.split("#");
if (split.length != 2) { return undefined; }
clazz = split[0];
num = parseInt(split[1]);
}
if (num < 1) { return undefined; }
var iter = heap.objects(clazz, false);
var i = 0;
while (iter.hasMoreElements()) {
i += 1;
var next = iter.nextElement();
if (num === i) { return next; }
}
return null;
}
// Usage:
objectnum("byte[]#123");
objectnum("char[]", 456);
objectnum("java.lang.String#789");
Related
I have two arrays. But when I change second - first change too.
I tried
.clone()
.copyOf()
but it didn't work for me.
object MatrixObject {
var table: Array<Array<Int>>? = null
fun randOf(n: Int) {
table= Array(n, { Array(n, { Random().nextInt(100 - 0) + 0 }) })
}
var tableF: Array<Array<Int>>? = null
get() {
if (field==null)
factorization()
return field
}
fun factorization() {
tableF = table!!
... //here I change elements of tableF
}
}
I tried
for(row in 0 until table!!.size)
tableF!![row] = Arrays.copyOf(table!![row], table!![row].size)
and
for(row in 0 until table!!.size)
tableF!![row] = table!![row].clone() // and copyOf()
but it still doesn't work.
I found the solution.I initialized the array.
tableF= Array(table!!.size, { Array(table!!.size, {0}) })
for(row in 0 until table!!.size)
tableF!![row] = table!![row].clone()
Firestore docs give details of how to manually calculate the stored size of a document, but there does not seem to be a function provided for this on any of document reference, snapshot, or metadata.
Before I attempt to use my own calculation, does anyone know of an official or unofficial function for this?
Here is my (completely untested) first cut for such a function from my interpretation of the docs at https://firebase.google.com/docs/firestore/storage-size
function calcFirestoreDocSize(collectionName, docId, docObject) {
let docNameSize = encodedLength(collectionName) + 1 + 16
let docIdType = typeof(docId)
if(docIdType === 'string') {
docNameSize += encodedLength(docId) + 1
} else {
docNameSize += 8
}
let docSize = docNameSize + calcObjSize(docObject)
return docSize
}
function encodedLength(str) {
var len = str.length;
for (let i = str.length - 1; i >= 0; i--) {
var code = str.charCodeAt(i);
if (code > 0x7f && code <= 0x7ff) {
len++;
} else if (code > 0x7ff && code <= 0xffff) {
len += 2;
} if (code >= 0xDC00 && code <= 0xDFFF) {
i--;
}
}
return len;
}
function calcObjSize(obj) {
let key;
let size = 0;
let type = typeof obj;
if(!obj) {
return 1
} else if(type === 'number') {
return 8
} else if(type === 'string') {
return encodedLength(obj) + 1
} else if(type === 'boolean') {
return 1
} else if (obj instanceof Date) {
return 8
} else if(obj instanceof Array) {
for(let i = 0; i < obj.length; i++) {
size += calcObjSize(obj[i])
}
return size
} else if(type === 'object') {
for(key of Object.keys(obj)) {
size += encodedLength(key) + 1
size += calcObjSize(obj[key])
}
return size += 32
}
}
In Android, if you want to check the size of a document against the maximum of 1 MiB (1,048,576 bytes), there is a library that can help you with that:
https://github.com/alexmamo/FirestoreDocument-Android/tree/master/firestore-document
In this way, you'll be able to always stay below the limit. The algorithm behind this library is the one that is explained in the official documentation regarding the Storage Size.
I want to fill-color-yellow all of the prime numbers (within a certain range) in a google spreadsheet that I am working on. I don't even know where to begin.
function isPrime(value) {
for(var i = 2; i < value; i++) {
if(value % i === 0) {
return false;
}
}
return value > 1;
}
function testcolorPrimes()
{
colorPrimes('#ffff00');
}
function colorPrimes(color)
{
var ss=SpreadsheetApp.getActiveSpreadsheet();
var sht=ss.getSheetByName('colorprimes');
var rng=sht.getDataRange();
var rngA=rng.getValues();
for(var i=0;i<rngA.length;i++)
{
for(var j=0;j<rngA[i].length;j++)
{
if(!isNaN(rngA[i][j]))
{
if(isPrime(rngA[i][j]))
{
var range = sht.getRange(i+1, j+1).setBackground(color);
}
}
}
}
SpreadsheetApp.flush();
}
I am using poppler, and I want to access topic or headings of a particular page number using poppler, so please tell me how to do this using poppler.
Using the glib API. Don't know which API you want.
I'm pretty sure there is no topic/heading stored with a particular page.
You have to walk the index, if there is one.
Walk the index with backtracking. If you are lucky, each index node contains a PopplerActionGotoDest (check type!).
You can grab the title from the PopplerAction object (gchar *title) and get the page number from the included PopplerDest (int page_num).
page_num should be the first page of the section.
Assuming your PDF has an index containing PopplerActionGotoDest objects.
Then you simply walk it, checking for the page_num.
If page_num > searched_num, go back one step.
When you are at the correct parent, walk the childs. This should give you the best match.
I just made some code for it:
gchar* getTitle(PopplerIndexIter *iter, int num, PopplerIndexIter *last,PopplerDocument *doc)
{
int cur_num = 0;
int next;
PopplerAction * action;
PopplerDest * dest;
gchar * title = NULL;
PopplerIndexIter * last_tmp;
do
{
action = poppler_index_iter_get_action(iter);
if (action->type != POPPLER_ACTION_GOTO_DEST) {
printf("No GOTO_DEST!\n");
return NULL;
}
//get page number of current node
if (action->goto_dest.dest->type == POPPLER_DEST_NAMED) {
dest = poppler_document_find_dest (doc, action->goto_dest.dest->named_dest);
cur_num = dest->page_num;
poppler_dest_free(dest);
} else {
cur_num = action->goto_dest.dest->page_num;
}
//printf("cur_num: %d, %d\n",cur_num,num);
//free action, as we don't need it anymore
poppler_action_free(action);
//are there nodes following this one?
last_tmp = poppler_index_iter_copy(iter);
next = poppler_index_iter_next (iter);
//descend
if (!next || cur_num > num) {
if ((!next && cur_num < num) || cur_num == num) {
//descend current node
if (last) {
poppler_index_iter_free(last);
}
last = last_tmp;
}
//descend last node (backtracking)
if (last) {
/* Get the the action and do something with it */
PopplerIndexIter *child = poppler_index_iter_get_child (last);
gchar * tmp = NULL;
if (child) {
tmp = getTitle(child,num,last,doc);
poppler_index_iter_free (child);
} else {
action = poppler_index_iter_get_action(last);
if (action->type != POPPLER_ACTION_GOTO_DEST) {
tmp = NULL;
} else {
tmp = g_strdup (action->any.title);
}
poppler_action_free(action);
poppler_index_iter_free (last);
}
return tmp;
} else {
return NULL;
}
}
if (cur_num > num || (next && cur_num != 0)) {
// free last index_iter
if (last) {
poppler_index_iter_free(last);
}
last = last_tmp;
}
}
while (next);
return NULL;
}
getTitle gets called by:
for (i = 0; i < num_pages; i++) {
iter = poppler_index_iter_new (document);
title = getTitle(iter,i,NULL,document);
poppler_index_iter_free (iter);
if (title) {
printf("title of %d: %s\n",i, title);
g_free(title);
} else {
printf("%d: no title\n",i);
}
}
I am writing a method to grab the lowest unique id in an ItemFileWriteStore. I have a boolean to tell me when I reach my condition, but I can't get the scope correct.
The function call works as I expect, apart from when newIdOkay is set to true, it is not recognised in the while loop.
Please can you explain why and what I have to do to get this right?
Many thanks
Here is my code:
function checkNewId( size ) {
if( size == 0 ) {
console.log('found new ID!');
newIdOkay = true;
}
}
function addContentItem( store ) {
// New ID
var newIdOkay = false;
var newId = 0;
while( newIdOkay == false && newId < 8 ) {
newId++;
store.fetch({ query: {id:newId}, onBegin: dojo.hitch(this, "checkNewId"),
start:0, count:0, sync:true });
}
}
To understand the reason, you need to have basic understanding of identifier resolution and scope chain in JavaScript. I recommend you to read this article: http://jibbering.com/faq/notes/closures/
Regarding you question, in the function addContentItem, the check in the while loop is tested against the identifier newIdOkay which is in the of the activation object corresponding to this function execution context. In the function checkNewId, the identifier newIdOkay you set is in the global object. So these two are not the same one. An easy fix is to move the newIdOkay in addContentItem function to the global scope.
var newIdOkay = false;
function checkNewId( size ) {
if( size == 0 ) {
console.log('found new ID!');
newIdOkay = true;
}
}
function addContentItem( store ) {
// New ID
var newId = 0;
while( newIdOkay == false && newId < 8 ) {
newId++;
store.fetch({ query: {id:newId}, onBegin: dojo.hitch(this, "checkNewId"),
start:0, count:0, sync:true });
}
}