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HTTP2 Server Push in Apache2

Server Push is one of the most significant features in the HTTP/2 protocol. In this post, We will see a very simple demo of the Server Push feature using HTTP/2. Below is the list of tools and tech used in the demo. Ubuntu 16.04 Chrome 60.0.3112.101 Apache2 Some browsers require TLS 1.2 to support HTTP/2. So We need to configure https on Apache server. Try to open the URL https://localhost in your browser. If the above URL not responding, It means you need to configure HTTPS on your Apache server. Please refer to the digital ocean page. https://www.digitalocean.com/community/tutorials/how-to-create-a-ssl-certificate-on-apache-for-ubuntu-14-04 I hope the URL https://localhost is working now and We can proceed further. We will do it into 2 parts. Part-I: We will just enable the HTTP/2 protocol Part-II: We will configure server push feature Part-I: Enable HTTP/2 First, check the below points. Make sure you have the http2 module in your apache. Naviga...
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Java Code Example For Aerospike Simple Operations [Read, Write, Delete]

                      I n the following post we will see sample java code to perform simple operation (read, write and delete Records) from Aerospike Database System. The code are self explanatory, follow the comments in code for better understanding. You only need a jar for java client which you can download from aerospike official website. Main Class import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import com.aerospike.client.AerospikeClient; import com.aerospike.client.AerospikeException; import com.aerospike.client.Bin; import com.aerospike.client.Host; import com.aerospike.client.Key; import com.aerospike.client.Record; import com.aerospike.client.Value; import com.aerospike.client.policy.ClientPolicy; import com.aerospike.client.policy.WritePolicy; public class Aerospike { public static void main(String... args){ ...
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Observer Pattern : Real Life Example and Java Code Example

Observer Pattern The observer pattern defines a one to many relation between objects so that when one object changes state, all of its dependent or related objects get notified automatically Real Life Example: Group Chat is a real life example of observer pattern. Whenever someone type some text in text button and hit send button. Every member get notified that someone texted in group. Java Code Example: public interface Subject { void register(Observer observer); void remove(Observer observer); void notifyRespectedObserver(String msg); } public interface Observer { void update(String msg); String write(String msg); String getName(); } public class Console implements Subject { public List memberList; public Console(){ memberList = new LinkedList (); } public void register(Observer observer){ memberList.add(observer); } public void remove(Observer observer){ memberList.remove(observer); } public void notifyRespectedObserver(String msg){ for...
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Design Pattern : Real Life Example and Java Code Example

                      I n software engineering, a design pattern is a general reusable solution to a commonly occurring problem within a given context in software design. A design pattern is not a finished design that can be transformed directly into the source or machine code. It is a description or template for how to solve a problem that can be used in many different situations. - Wiki To explore the various kind of Design Patterns follow the below links. ----------------------------------------------------------------------------------------------------------------- Observer Pattern ----------------------------------------------------------------------------------------------------------------- Proxy Pattern ----------------------------------------------------------------------------------------------------------------- Builder Pattern ------------------------...
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