Skip to main content

Design Pattern : Real Life Example and Java Code Example

                     In 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
-----------------------------------------------------------------------------------------------------------------
Singleton Pattern
-----------------------------------------------------------------------------------------------------------------
Factory Pattern
-----------------------------------------------------------------------------------------------------------------
Decorator Pattern
-----------------------------------------------------------------------------------------------------------------

Labels:

Comments

  1. Shubham22 December 2015 at 06:43

    Please comment if you got any other interesting real life examples.

    ReplyDelete

Post a Comment

Popular posts from this blog

com.mongodb.MongoCommandException: Command failed with error 18: 'Authentication failed.' on server

If you are trying to connect Mongo DB Server and it insanely throwing following error. com.mongodb.MongoTimeoutException : Timed out after 1000 ms while waiting for a server that matches ReadPreferenceServerSelector{readPreference=primary}. Client view of cluster state is {type=UNKNOWN, servers=[{address=192.168.1.10:27010, type=UNKNOWN, state=CONNECTING, exception={ com.mongodb.MongoSecurityException: Exception authenticating MongoCredential {mechanism=null, userName='user123', source='admin', password=<hidden>, mechanismProperties={}}}, caused by {com.mongodb.MongoCommandException: Command failed with error 18 : 'Authentication failed.' on server 192.168.1.10:27010 . The full response is { "ok" : 0.0, "code" : 18, "errmsg" : "Authentication failed." }}}] If you start looking the error content First you encounter with Timeout Exception which may mislead you. It is basically an authentication error. I...
5 comments
Read more

How to Create a Namespace in Aerospike Database

                      T his post is about creating a namespace in Aerospike. I could not find any concrete method to create a namespace like create database in MySQL and MongoDB. So I am suggesting a way to create a namespace in Aerospike Database. Step-1: Locate config file aerospike.conf and open it in your favorite editor and make sure you have permission to modify the file. In my system the path of file /etc/aerospike/aerospike.conf (Default in Ubuntu). Here the content of the file. # Aerospike database configuration file. service { user root group root paxos-single-replica-limit 1 # Number of nodes where the replica pidfile /var/run/aerospike/asd.pid service-threads 4 transaction-queues 4 transaction-threads-per-queue 4 proto-fd-max 15000 } logging { # Log file must be an absolute path. file /var/log/aerospike/aerospike.log { context any info } } net...
2 comments
Read more

java.lang.IllegalArgumentException: Could not instantiate implementation: org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftStoreManager

If you are trying to get started with Janus Graph with Apache Cassandra. You may get the following error. Caused by: org.janusgraph.diskstorage.TemporaryBackendException: Temporary failure in storage backend at org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftStoreManager.getCassandraPartitioner(CassandraThriftStoreManager.java:219) ~[janusgraph-cassandra-0.2.0.jar:na] at org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftStoreManager.<init>(CassandraThriftStoreManager.java:198) ~[janusgraph-cassandra-0.2.0.jar:na] ... 48 common frames omitted Caused by: org.apache.thrift.transport.TTransportException: java.net.ConnectException: Connection refused (Connection refused) at org.apache.thrift.transport.TSocket.open(TSocket.java:187) ~[libthrift-0.9.2.jar:0.9.2] at org.apache.thrift.transport.TFramedTransport.open(TFramedTransport.java:81) ~[libthrift-0.9.2.jar:0.9.2] at org.janusgraph.diskstorage.cassandra.thrift.thriftpool.CTConnectionFactory.makeR...
2 comments
Read more