In this post under Spring Retry, I will show with example how to add RetryListener to our Spring Retry code. RetryListener interface will help us to react to events like (react before first retry attempt, react after every failed retry attempt, react after final retry attempt). RetryListener interface has the below three interface methods.1) void…… Continue reading Creating Custom RetryListener (using xml configuration)
Spring Retry simple example (using interceptor)
In this post under Spring Retry, I will explain how to configure Spring Retry framework into your application using Spring AOP with simple example. At minimum, you need the below jars in your classpath1) spring-retry-1.3.1.jar2) commons-logging-1.2.jar3) spring-core-4.3.22.RELEASE.jar4) spring-aop-4.3.22.REELEASE.jar5) spring-beans-4.3.22.RELEASE.jar6) spring-context-4.3.22.RELEASE.jar7) spring-expression-4.3.22.RELEASE.jar8) aspectjweaver-1.8.9.jar For our example we will use the below service class Service1 public class…… Continue reading Spring Retry simple example (using interceptor)
Setting private fields of a class for unit testing
In this post under Powermock, I will with example show how to set private fields of a class for unit testing. For example, consider you have a class as shown below to be tested Class To Be Tested package package5; import java.util.Date; import java.util.Random; public class Example5 { private Random random = new Random(); public…… Continue reading Setting private fields of a class for unit testing
Creating custom logic for Disposable
In this post under RxJava, I will show with example how to add custom logic when a subscription between Observable and Observer is being disposed. You can add custom logic in Disposable only if you are creating an Observable using callback style. In my previous post under RxJava I have shown you how to create…… Continue reading Creating custom logic for Disposable
Using CompositeDisposable
In this post under RxJava, I will show with an example the purpose and how to use the CompositeDisposable class. When you have multiple subscriptions like shown below, we get a multiple Disposable object one for each subscription. Observable<Long> observable1 = Observable.interval(1000, TimeUnit.MILLISECONDS); Disposable disposable1 = observable1.subscribe((t) -> System.out.println(“Observable1: ” + t)); Observable<Long> observable2 =…… Continue reading Using CompositeDisposable
Disposing an automatically created Observer
In this post, I will explain how to dispose an automatically created Observer. In all my previous posts, when I provide the below code snippet, it was creating an Observer internally that will compose these lambda callback functions provided as arguments to the “subscribe” method. observable.subscribe(t -> System.out.println(t), t -> t.printStackTrace(), () -> System.out.println(“Complete”)); In…… Continue reading Disposing an automatically created Observer
Creating and Disposing an Observer Manually
In this post under RxJava, I will explain how to create and dispose an Observer manually. Till now in all my previous posts under RxJava, I was not creating and disposing an Observer manually. The Observer was created internally by RxJava. All I was doing was providing callback functions for onNext,onComplete, and onError events as…… Continue reading Creating and Disposing an Observer Manually
ConnectableObservable’s refCount method
In this post I will explain “refCount” method with an example. In my previous posts under RxJava, I explained about ConnectableObservable’s “autoConnect” method. This method is similar to “autoConnect” method. By calling refCount is nothing but calling autoConnect and passing 1 as an argument. Observable<Long> observable = Observable.interval(1, TimeUnit.SECONDS); observable = observable.publish().refCount(); is similar to…… Continue reading ConnectableObservable’s refCount method
autoConnect vs connect method
In this post I will explain with example the difference between autoConnect and connect. In terms of similarities both are used with ConnectableObservable which is an Hot Observable. Both tells the Observable when to start emitting items. The difference being when to tell the Observable, at what point to start emitting items. For example, if…… Continue reading autoConnect vs connect method
Cold Observable vs Hot Observable
In this post under RxJava, I will explain the difference between Cold Observable and Hot Observable with the help of java code which will create both Hot and Cold Observable and emits items from both of them. You can compare the output of Hot and Cold Observable to understand there difference. In my previous post…… Continue reading Cold Observable vs Hot Observable