Decoupling the tiers

We know that the application architecture plays a key role to ensure its candidature for Hybrid Cloud and it should be conducive for the use in some of the use cases.

The first thing that we need to do is to decouple the tiers of the applications if it needs to be considered for distributed or the co-existant use cases mentioned in the afore section. Lets take a look at how is it done:

The two major methods used in decoupling the different tiers are:

• Load balancers 
• Queues (AMQP - Asynchronous Message Queuing Protocol)/ESB (Enterprise Service Bus) - (in older applications)

Load balancers are normally used when there is a direct call being made to the tier, this could be the user making a call to the web tier or even the web tier making API calls to the application tier. 

An AMQP is normally used when there is a task at hand, and there might...