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1. Teknik Singleton Di Dalam Csharp 1

Karena memang disini admin pun masih dalam tahap awal pembelajaran. Biasanya, ketika kita akan memulai untuk membuat aplikasi windows form, aplikasi pertama yang dibuat adalah kalkulator. Namun, seperti pada judul diatas, aplikasi kalkulator ini masih sangat sederhana hanya dapat mengoperasikan operasi aritmatika (+), (-), (x), dan (/) saja. Jan 08, 2016  Perulangan Dalam Bahasa Pemrograman CSharp, Perulangan disini bermaksud adalah mengulang setiap eksekusi statement selama kondisi yang diberikan terpenuhi. While, do-while, for. Design Pettern Singleton dengan bahasa CSharp. Akan mempermudah koneksi ke database tanpa memerlukan memory yang tidak terlalu besar salah satunya adalah Singleton. Cara kerja singleton adalah dengan menggunakan 1 koneksi saja tetapi dapat menampung semua query yang akan di kirimkan ke database untuk contohnya pada gambar di.

In computer programming, lazy initialization is the tactic of delaying the creation of an object, the calculation of a value, or some other expensive process until the first time it is needed. It is a kind of lazy evaluation that refers specifically to the instantiation of objects or other resources.

This is typically accomplished by augmenting an accessor method (or property getter) to check whether a private member, acting as a cache, has already been initialized. If it has, it is returned straight away. If not, a new instance is created, placed into the member variable, and returned to the caller just-in-time for its first use.

If objects have properties that are rarely used, this can improve startup speed. Mean average program performance may be slightly worse in terms of memory (for the condition variables) and execution cycles (to check them), but the impact of object instantiation is spread in time ('amortized') rather than concentrated in the startup phase of a system, and thus median response times can be greatly improved.

In multithreaded code, access to lazy-initialized objects/state must be synchronized to guard against race conditions.

• 2Examples

The 'lazy factory'[edit]

In a software design pattern view, lazy initialization is often used together with a factory method pattern. This combines three ideas:

• Using a factory method to create instances of a class (factory method pattern)
• Storing the instances in a map, and returning the same instance to each request for an instance with same parameters (multiton pattern)
• Using lazy initialization to instantiate the object the first time it is requested (lazy initialization pattern)

Examples[edit]

Actionscript 3[edit]

The following is an example of a class with Lazy initialization implemented in Actionscript:

Basic Usage:

C[edit]

In C, lazy evaluation would normally be implemented inside a single function, or a single source file, using static variables.

How to update my ami bios. In a function:

Using a single source file instead allows the state to be shared between multiple functions, while still hiding it from non-related functions.

fruit.h:

fruit.c:

main.c:

C#[edit]

Teknik Singleton Di Dalam Csharp 1

In .NET 4.0 Microsoft has included a Lazy class that can be used to do lazy loading.Below is some dummy code that does lazy loading of Class Fruit

Here is a dummy example in C#.

The Fruit class itself doesn't do anything here, The class variable _typesDictionary is a Dictionary/Map used to store Fruit instances by typeName.

A fairly straightforward 'fill-in-the-blanks' example of a Lazy Initialization design pattern, except that this uses an enumeration for the type

C++[edit]

Here is an example in C++.

Crystal[edit]

Output:

Haxe[edit]

Here is an example in Haxe^[1]

Usage

Java[edit]

Here is an example in Java.

Output

JavaScript[edit]

Here is an example in JavaScript.

Output

PHP[edit]

Here is an example of lazy initialization in PHP 5:

Python[edit]

Here is an example in Python.

Ruby[edit]

Here is an example in Ruby, of lazily initializing an authentication token from a remote service like Google. The way that @auth_token is cached is also an example of memoization.

Scala[edit]

Scala has built-in support for lazy variable initiation.^[2]

Smalltalk[edit]

Here is an example in Smalltalk, of a typical accessor method to return the value of a variable using lazy initialization.

The 'non-lazy' alternative is to use an initialization method that is run when the object is created and then use a simpler accessor method to fetch the value.

Note that lazy initialization can also be used in non-object-oriented languages.

See also[edit]

References[edit]

1. ^'Lazy initialization - Design patterns - Haxe programming language cookbook'. 2018-01-11. Retrieved 2018-11-09.
2. ^https://books.google.com/books?id=Qt-bRFetWw0C&lpg=PA30&ots=hW9ax5LeHb&dq=scala%20lazy%20variables&pg=PA30#v=onepage&q=scala%20lazy%20variables&f=false

External links[edit]

• Article 'Java Tip 67: Lazy instantiation - Balancing performance and resource usage' by Philip Bishop and Nigel Warren