Tutorial by Examples: p

Mediator pattern defines an object (Mediator) that encapsulates how a set of objects interact. It enables many-to-many communication. UML diagram: Key components: Mediator: Defines an interface for communication between Colleagues. Colleague: Is an abstract class, which defines the events to b...

The Monostate pattern is usually referred to as syntactic sugar over the Singleton pattern or as a conceptual Singleton. It avoids all the complications of having a single instance of a class, but all the instances use the same data. This is accomplished mostly by using static data members. One o...

import unittest def addition(*args): """ add two or more summands and return the sum """ if len(args) < 2: raise ValueError, 'at least two summands are needed' for ii in args: if not isinstance(ii, (int, long, float, compl...

Installation npm install forever -g cd /node/project/directory Usages forever start app.js

1. Logs: By default, Heroku allows only 1500 lines of consolidated logs. When more than 1500 lines of logs are required, one has to use addons provided Heroku. 2. Router: HTTP request have 30s timeout for initial response and 55s timeout thereafter. Maximum of 1MB buffer allowed for response. 3....

Simply-expanded variables behave like variables from traditional programming languages. The expression on the right-hand side is evaluated, and the result is stored in the variable. If the right-hand side contains a variable reference, that variable is expanded before the assignment takes place. ...

When defining a recursively-expanded variable, the contents of the right-hand side are stored as-is. If a variable reference is present, the reference itself is stored (not the value of the variable). Make waits to expand the variable references until the variable is actually used. x = hello y =...

The += operator is a common extension that adds the specified content to the end of the variable, separated by a space. x = hello x += world Variable references in the right-hand side will be expanded if and only if the original variable was defined as a simply-expanded variable.

Helpers and fakeApplication Class Helpers is used a lot for unit tests. It imitates a Play application, fakes HTTP requests and responses, session, cookies - all whatever may be needed for tests. A controller under the test should be executed in a context of a Play application. The Helpers method f...

File Structure: pom.xml src/test/java/PlayStoreAutomation.java Launch command: mvn test -Dtest=PlayStoreAutomation PlayStoreAutomation.java import org.junit.AfterClass; import org.junit.BeforeClass; import org.junit.Test; import io.appium.java_client.android.AndroidDriver; import i...

Before continuing, make sure you've read the Installation chapter and can access your new Symfony app in the browser. Suppose you want to create a page - /lucky/number - that generates a lucky (well, random) number and prints it. To do that, create a "Controller class" and a "con...

Yield true on the stack if currentpoint executes successfully, or false if it signals a /nocurrentpoint error. {currentpoint pop pop} stopped not % bool

In the scenario that a controller throws an exception, we can define exception handler methods to build and return specific responses. It is important to note that the defined exception handlers within the given controller will only apply to exceptions that occur within that controller. @Controller...

We're going to build an application that stores POJOs in a database. The application uses Spring Data JPA to store and retrieve data in a relational database. Its most compelling feature is the ability to create repository implementations automatically, at runtime, from a repository interface. Main...

We add three records to our collection test as: > db.test.insert({"key":"value1","key2":"Val2","key3":"val3"}) WriteResult({ "nInserted" : 1 }) > db.test.insert({"key":"value2","key2":"V...

Loading custom fonts can be lead to a bad performance. I highly recommend to use this little helper which saves/loads your already used fonts into a Hashtable. public class TypefaceUtils { private static final Hashtable<String, Typeface> sTypeFaces = new Hashtable<>(); /** * Get...

Component definition ko.components.register('progress-bar', { viewModel: function(params) { var that = this; // progress is a numeric value between 0 and 100 that.progress = params.progress; that.progressPercentual = ko.computed...

build.gradle repositories { maven { url 'http://4thline.org/m2' } } dependencies { // Cling compile 'org.fourthline.cling:cling-support:2.1.0' //Other dependencies required by Cling compile 'org.eclipse.jetty:jetty-server:8.1.18.v20150929' compile 'org.eclipse.jetty:jetty-servlet:8....

String myIp = getIpAddress(); int port = 55555; //creates a port mapping configuration with the external/internal port, an internal host IP, the protocol and an optional description PortMapping[] desiredMapping = new PortMapping[2]; desiredMapping[0] = new PortMapping(port,myIp, PortMapping.Pr...

As an alternative to using Html.ActionLink to generate links in a view, you can use Html.RouteLink To make use of this feature, you need to configure a route, for example: public static void RegisterRoutes(RouteCollection routes) { routes.MapRoute( "SearchResults", "{...