Tutorial by Examples: ed

first add the OkHttp to the gradle build file of the app module compile 'com.squareup.picasso:picasso:2.5.2' compile 'com.squareup.okhttp:okhttp:2.4.0' compile 'com.jakewharton.picasso:picasso2-okhttp3-downloader:1.0.2' Then make a class extending Application import android.app.Application; ...

In Java, all number primitives are signed. For example, an int always represent values from [-2^31 - 1, 2^31], keeping the first bit to sign the value - 1 for negative value, 0 for positive. Basic shift operators >> and << are signed operators. They will conserve the sign of the value. ...

After adding the GreenDao library dependency and Gradle plugin, we need to first create an entity object. Entity An entity is a Plain Old Java Object (POJO) that models some data in the database. GreenDao will use this class to create a table in the SQLite database and automatically generate helpe...

Before 1.2, the only way to persist state/retain a checkpoint after a job termination/cancellation/persistant failure was through a savepoint, which is triggered manually. Version 1.2 introduced persistent checkpoints. Persistent checkpoints behave very much like regular periodic checkpoints except...

This code will prompt you to create the directory with :w, or just do it with :w!: augroup vimrc-auto-mkdir autocmd! autocmd BufWritePre * call s:auto_mkdir(expand('<afile>:p:h'), v:cmdbang) function! s:auto_mkdir(dir, force) if !isdirectory(a:dir) \ && (a:f...

Given a ByteBuffer instance one can write primitive-type data to it using relative and absolute put. The striking difference is that putting data using the relative method keeps track of the index the data is inserted at for you, while the absolute method always requires giving an index to put the d...

Below is an Employer entity class which is mapped to the table employer. As you can see I used fetch = FetchType.LAZY instead of fetch = FetchType.EAGER. The reason I am using LAZY is because Employer may have a lot of properties later on and every time I may not need to know all the fields of an Em...

Asks the delegate to open a resource specified by a URL, and provides a dictionary of launch options. Example of usage: func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool { return SomeManager.shared.handle( ...

To Get context: NSManagedObjectContext *context = ((AppDelegate*)[[UIApplication sharedApplication] delegate]).persistentContainer.viewContext; To fetch data: NSFetchRequest<EntityName *> *fetchRequest = [EntityName fetchRequest]; NSError *error ; NSArray *resultArray= [context executeF...

HTML : <li class="item" ng-repeat="schedule in Schedules | filter:scheduleSearch | limitTo:numberOfItemsToDisplay"> Display some data </li> <ion-infinite-scroll on-infinite="addMoreItem()" ng-if="Schedules.length > numberOfItemsToDisplay&...

Redis provides the SCAN command to iterate over the keys in the database matching a particular pattern. Redis supports glob style pattern matching in the SCAN command. The SCAN command provides a cursor-based iterator over the Redis keyspace. The iterative call sequence to SCAN starts with the us...

The redis-py client provides two classes StrictRedis and Redis to establish a basic connection to a Redis database. The Redis class is provided for backwards compatibility and new projects should use the StrictRedis class. One of the recommended ways to establish a connection, is to define the con...

Ffmpeg is a swiss knife for streaming project. For any kind of device streaming you only need to get the specification of device. To list the device ffmpeg -f dshow -list_devices true -i dummy Command prompt will list all the aviable device on machine. [dshow @ 0000000004052420] DirectShow vid...

The basic unit of code used by JShell is the snippet, or source entry. Every time you declare a local variable or define a local method or class, you create a snippet whose name is the identifier of the variable/method/class. At any time, you can edit a snippet you have created with the /edit comman...

1) IP based vhosts <VirtualHost 192.168.13.37> ServerName example.com DocumentRoot /var/www/domains/example.com/html ErrorLog /var/log/example.com/error.log CustomLog /var/log/example.com/access.log common </VirtualHost> <VirtualHost 192.168.47.11> ...

In the JNDI declaration you may want to encrypt the username and password. You have to implement a custom datasource factory in order to be able to decrypt the credentials. In server.xml replace factory="org.apache.tomcat.jdbc.pool.DataSourceFactory" by factory="cypher.MyCustomDataS...

Interceptors are a good tool for implementing cross-cutting concerns such as logging or authentication. Let's say we have a following service: public interface IService { string CreateOrder(NetworkCredential credentials, Order orderToCreate); string DeleteOrder(NetworkCredential credenti...

For registration like this: var container = new WindsorContainer(); container.Register( Component.For<FirstInterceptor>(), Component.For<SecondInterceptor>(), Component.For<ThirdInterceptor>(), Component.For<IService>() .ImplementedBy<Servi...

The code will work on Windows and Linux. It runs on .NET Core or .NET Standard. The only difference is that, if you wish to run on .NET Core, you should use project.json. If you wish to run on .NET Standard, you should use packages.config. The API Client Library for Cloud Resource Manager API is a...

I won't repeat it all here: "Application Default Credentials provide a simple way to get authorization credentials for use calling Google APIs." If you can use Application Default Credentials, do. There is an extra step you will need to perform the before first using Application Default ...