Inter Portlet Communication(IPC) in Liferay

Inter Portlet Communication ie IPC is needed when we have to communicate between two portlets. Some times these portlets are on same page sometimes they may be on different page. 

Example:- We have a drop down in one portlet by which we can select country name and another portlet display the currency, states, national flag, climate on the basis of country selected by first portlet. In this case we have to send value from first portlet to another.

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Client Side Inter Portlet Communication in Liferay

Today we will discuss Client Side Inter Portlet Communication in Liferay . In my opinion it is the simplest way for sharing data between two portlets which are on same page. Liferay provide two basic methods for this:-

1)For Client

Liferay.fire('eventName',{
            parameter1: value1,
            parameter2: value2

    });

2)For Receiver

 Liferay.on('eventName',function(event) {
   var firstValue = event.parameter1,
   var  secondValue = event.parameter2

});

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Inter Portlet Communication (IPC) using Events in Liferay

We already know IPC using public render parameters  .Today we will see how to do IPC using Events. Events based IPC was introduced in JSR 286 or we can say in Portlet 2.0. According to this a new method processEvent introduced in Life Cycle of Portlet.Here one Portlet can Produce a event which can be consumed by other portlets.

We take a simple scenario where user can select food type from one portlet and second portlet shows food items on the basis of first portlet. This is a Sender, Receiver kind of scenario but for events there may be one sender and multiple receivers.Here we create two project and each project contain one portlet.

So lets start this step by step:-

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Inter Portlet Communication (IPC) using Public Render Parameter in Liferay

We already know that render Parameter set in processAction is available to render method of same portlet. But if we set render parameter in one portlet and want to get in another portlet . In this case we use Public Render Parameter so that parameter set in one portlet can be available to another Portlet.This feature is known as Inter Portlet Communication(IPC)  using Public Render Parameter.

We take a simple scenario where user can select food type from one portlet and second portlet shows food items on the basis of first portlet. This is a Sender, Receiver kind of scenario.Here we create two project and each project contain one portlet.

So lets start this step by step:-

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Inter Portlet Communication (IPC) by Portlet Session in Liferay

Inter Portlet Communication can be done by many ways like by using events,public render parameters and Portlet Session. Today we discuss about IPC by using Portlet Sessions. Here we set some value in one portlet and get value in other Portlet.

We take a simple scenario where user can select food type from one portlet and second portlet shows food items on the basis of first portlet. This is a Sender, Receiver kind of scenario.Here we create two project and each project contain one portlet.

So lets start this step by step:-

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