What is a WeakHashMap and when to use it? [duplicate]

What is a WeakHashMap and when to use it? [duplicate]

This question already has an answer here: When would you use a WeakHashMap or a WeakReference? 10 answers What is a WeakHashMap and when should one be

How to use the repository pattern correctly?

How to use the repository pattern correctly?

I am wondering how should I be grouping my repositories? Like from the examples I seen on the asp.net mvc and in my books they basically use one repository per database table. But that seems like a lot of repositories leading you to have to

Cannot find module in Node.js

Cannot find module in Node.js

I have folowing directory structure:--app -- test -- server.js -- app.jsI try to call function in app.js which exports from server.js, i do:var server = require("test/server");But get error:Error: Cannot find module 'test/server'How ca

Copy file to root of XCode project when building

Copy file to root of XCode project when building

I am trying to implement Google Analytics (GA) in my iOS apps. I have two different targets that have different tracking-ids for GA. GA requires a GoogleService-Info.plist (cannot be renamed) file to be placed in the root of the app folder

Sinking Events of DWebBrowserEvent2 hangs the navigation

Sinking Events of DWebBrowserEvent2 hangs the navigation

I have a problem just like JimEvans in Sinking DWebBrowserEvents2 events appears to hang programmatic navigation but I can't understand the anwser, can somebody tell me more about it??I'm manipulating the IE Explorer by plaint C++. Some cod

Removing duplicates from Angular JS ng-options / ng-repeat

Removing duplicates from Angular JS ng-options / ng-repeat

I have the following: $scope.jsonmarkers = [{ "name": "Jeff", "type": "Organisation + Training Entity", "userID": "1"}, { "name": "Fred", "type": "Organisation + Training Entity", "userID": "2"}];A

insert speed in mysql vs cassandra

insert speed in mysql vs cassandra

I have a lot of (about 1 million in second)structural data that must be insert to databaseI see a lot of benchmark about sql vs noSql and type of Nosql then collect cassandra as database but I create a benchmark to test mysql vs cassandra i

Relation between package and a sub package in Java

Relation between package and a sub package in Java

Can anyone please let me know the relation between a package and a sub package in java?Thanks 1:There is no relation between packages and subpackages. It is just a hierarchical structure for the convenience of a developer and has no furt

How to go about modifying the Wordpress “Pages Add New Screen”

How to go about modifying the Wordpress “Pages Add New Screen”

I have been thinking about developing my own theme framework for worpdress. I'd like to use jquery ui to build a bootstrap 3.0 drag and drop interface, which I already have worked out, but I can't figure out how to edit the "Pages Add New S

Read text file in java

Read text file in java

Hey,I need to read a textfile in java. The problem is that the file has the following format:Id time1 time2 time3 ...ID2 time1 time2 time3 ...I need to be able to first read all the IDs, then read all the time1, then all time2 etc.Can anyon

How to edit the directory structure in Maven?

How to edit the directory structure in Maven?

I am using Maven project, when i create the Maven module of jar packaging, maven auto generates directory structue as src/main/java, src/main/resources, src/test/java and src/test/resources. Can I edit the above names as per my wish? Can I

How do I marshall a pointer to a pointer of an array of structures?

How do I marshall a pointer to a pointer of an array of structures?

My C declarations are as follows:int myData(uint myHandle, tchar *dataName, long *Time, uint *maxData, DATASTRUCT **data);typedef struct { byte Rel; __int64 Time; char Validated; unsigned char Data[1];} DATASTRUCT ;My C# declarations ar

Odd INNER JOIN syntax and encapsulation

Odd INNER JOIN syntax and encapsulation

I'm usually pretty well versed with JOINS, but this is new.Suppose three tables (classic case of two tables and a third, linker table):Customer Product Transaction-------- ------- -----------ID ID CustomerIDName Desc

Import javascript files with jinja from static folder [duplicate]

Import javascript files with jinja from static folder [duplicate]

This question already has an answer here: Link to Flask static files with url_for 1 answer Pass parameter with Python Flask in external Jav

Marshalling .NET generic types

Marshalling .NET generic types

Here is a C# program that tries Marshal.SizeOf on a few different types:using System;using System.Runtime.InteropServices;[StructLayout(LayoutKind.Sequential)]class AClass { }[StructLayout(LayoutKind.Sequential)] struct AStruct { }[StructLa

Create variable from print_r output [duplicate]

Create variable from print_r output [duplicate]

This question already has an answer here: How create an array from the output of an array printed with print_r? 7 answers How can i create variable fro

What is the memory footprint of a Nullable

What is the memory footprint of a Nullable

An int (Int32) has a memory footprint of 4 bytes. But what is the memory footprint of: int? i = null;and :int? i = 3;Is this in general or type dependent? 1:I'm not 100% sure, but I believe it should be 8 Bytes, 4 bytes for the int32, an

Size of struct with a single element

Size of struct with a single element

Givenstruct S { SomeType single_element_in_the_struct;};Is it always true thatsizeof(struct S) == sizeof(SomeType)Or it may be implementation dependent? 1:This will usually be the case, but it's not guaranteed. Any struct may have unna

Nested has_many relationships in cypher

Nested has_many relationships in cypher

I have a nested has_many relationship that I'm trying to map to a json result.The following example from the blog shows the kind of thing I want to do, except it's not nested MATCH (a:Person { name: "Andres" })-[:FATHER_OF]->(child) RETURN

How to create new Type in MPI

How to create new Type in MPI

I am new to MPI and I want to create a new datatype for Residence struct. I just want to see if I can create the new type right way. struct Residence { double x; double y; };My new MPI Type MPI_Datatype createRecTyp

Triggering global behavior for a “loading” component such as with Angular 1's $emit

Triggering global behavior for a “loading” component such as with Angular 1's $emit

I'm making a loading overlay component in Angular 2, and I realized, I'm not sure how to trigger it. In Angular 1, I would emit something and listen in the loading spinner directive, to hide or show. In Angular 2, I suspect I need to be doi

What is partition checker in ARM Secure Mode

What is partition checker in ARM Secure Mode

As per this linkhttp://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0333h/Chdfjdgi.htmlunder System boot sequence...Program the partition checker to allocate physical memory available to the Non-secure OS.What is the partition ch

How can I convert between related types through a common initializer?

How can I convert between related types through a common initializer?

I'm trying to build up a family of types that can be converted to each other. For example, Float and Double can be converted to each other through their initializers. I'd like to not have to create an exhaustive list of initializers showi

PhoneGap Notification.Alert not working

PhoneGap Notification.Alert not working

Okay I've been working on this issue for a while now and can't figure this thing out. Simple PhoneGap test app, trying to show an alert.Using Cordova 2.9.0 for iOS. I've added some simple test code and tested it in chrome to see where it br

Random documents from MongoDB using spring-data

Random documents from MongoDB using spring-data

I'm able to do it by using this mongodb native query:db.books.aggregate( [ { $sample: { size: 15 } } ])But how to do it in spring-data-mongodb ?I found no similar operation in Aggregation class of Spring Aggregation Framework 1:Update: