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
Creating Custom Observable Using Callback Style
In this post under RxJava, I will show with example how to create a custom Observable using Callback style. In Callback style, a code is executed when a specific event occurs. In our case, the event is Observer subscribing to Observable. When this event occurs the callback code is called. For our example, we create…… Continue reading Creating Custom Observable Using Callback Style
Spring Retry simple example (using annotation)
In this post under Spring Retry, I will explain how to configure Spring Retry framework into your application using annotation 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 the example I will use the below service class Service6 1 import org.springframework.retry.annotation.Retryable;…… Continue reading Spring Retry simple example (using annotation)
Spring Retry simple example (using builder pattern)
In this post under Spring Retry, I will explain how to configure Spring Retry framework into your application using builder pattern 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 the example I will the below service class Service1 class public class…… Continue reading Spring Retry simple example (using builder pattern)
Spring Retry simple example (using xml configuration)
In this post under Spring Retry, I will explain how to configure Spring Retry framework into your application 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 If we want to retry a particular failed operation, we can take the help of Spring…… Continue reading Spring Retry simple example (using xml configuration)
Jsoup’s connect method
In my previous post under Jsoup, I showed with example how to parse an html document located on world wide web using overloaded “parse” method. In this post, I will show with example another approach of doing the same thing. The Jsoup javadoc recommends to follow this approach instead of using overloaded “parse” method. Below…… Continue reading Jsoup’s connect method
Externalizing the logger and handler configuration to properties file
In all my previous posts under java logging, I have configured logger and handler programmatically. We can externalize those configurations to properties file also. The advantage of this approach is that we can change configurations at any time without recompiling java class. In this post I will show with example how to do that. Let’s…… Continue reading Externalizing the logger and handler configuration to properties file
Setting Log Levels for Logger and Handler
In this post under Java Logging, I will explain with example how to set log levels for Logger and Handler implementations. Please not the log level of Logger and Handler should be same otherwise some messages will not be logged by the handler. We set the log levels by calling “setLevel” method available on Logger…… Continue reading Setting Log Levels for Logger and Handler