InterPortlet Communication Liferay 6.0

InterPortlet Communication:

1. create ipc-baseball "IPC Baseball"
2. in the portlet.xml file.

First, change the portlet name, display name, and portlet class:

<portlet-name>pitcher-portlet</portlet-name>

<display-name>Pitcher Portlet</display-name>

<portlet-class>com.plugin.portlet.PitcherPortlet</portlet-class>

3. Next add the init parameter in portlet.xml

<init-param>

<name>view-jsp</name>

<value>/pitcher/view.jsp</value> A

</init-param>

4. Modify the portlet-info tag so it reads:

<portlet-info>

<title>Pitcher Portlet</title>

<short-title>Pitcher Portlet</short-title>

<keywords>IPC Baseball Pitcher</keywords>

</portlet-info>

5. Next add Catcher declaration for the portlet in portlet.xml creating a new

<portlet>

<portlet-name>catcher-portlet</portlet-name>

<display-name>Catcher Portlet</display-name>

<portlet-class>

com.liferayinaction.portlets.CatcherPortlet

</portlet-class>

<init-param>

<name>view-jsp</name>

<value>/catcher/view.jsp</value>

</init-param>

<expiration-cache>0</expiration-cache>

<supports>

<mime-type>text/html</mime-type>

</supports>

<portlet-info>

<title>Catcher Portlet</title>

<short-title>Catcher Portlet</short-title>

<keywords>IPC Baseball Catcher</keywords>

</portlet-info>

<security-role-ref>

<role-name>administrator</role-name>

</security-role-ref>

<security-role-ref>

<role-name>guest</role-name>

</security-role-ref>

<security-role-ref>

<role-name>power-user</role-name>

</security-role-ref>

<security-role-ref>

<role-name>user</role-name>

</security-role-ref>

</portlet>

6. Below the last </portlet> add the event

<event-definition>

<qname xmlns:x="http://liferay.com/events">x:ipc.pitch</qname>

<value-type>java.lang.String</value-type>

</event-definition>

7. Place the before Pitcher Portlet’s </portet> and below last <security-role-ref> of Pitcher Portlet to tell the event handle who is sending the event.

<supported-publishing-event>

<qname xmlns:x="http://liferay.com/events">x:ipc.pitch</qname>

</supported-publishing-event>

8. Place the before Catcher Portlet’s </portet>to tell the event handler who is recieveing the event

<supported-processing-event>

<qname xmlns:x="http://liferay.com/events">x:ipc.pitch</qname>

</supported-processing-event>

9. Create docroot/catcher/view.jsp

<%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet" %>

<portlet:defineObjects />

<%

String pitch = (String)renderRequest.getParameter("pitch");

System.out.println(pitch);

%>

<p>And the pitch is....</p>

<p>

<% if (pitch!=null) { %>

<%=pitch %>pitch

<% } else { %>

... waiting for pitch.

<% } %>

10. Create docroot/pitcher/view.jsp

<%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet" %>

<portlet:defineObjects />

<p>Click the link below to pitch the ball. </p>

<a href="<portlet:actionURL name="pitchBall"></portlet:actionURL>">Pitch!</a>

11. Under docroot/src create a class CatchPortlet.java

package com.plugin.portlet;

import java.io.IOException;

import javax.portlet.ActionRequest;

import javax.portlet.ActionResponse;

import javax.portlet.GenericPortlet;

import javax.portlet.PortletException;

import javax.portlet.PortletMode;

import javax.portlet.PortletPreferences;

import javax.portlet.PortletRequestDispatcher;

import javax.portlet.PortletURL;

import javax.portlet.RenderRequest;

import javax.portlet.RenderResponse;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import javax.portlet.EventRequest;

import javax.portlet.Event;

import javax.portlet.EventResponse;

import java.math.*;

import java.lang.annotation.*;

import javax.portlet.*;

import javax.xml.namespace.QName;

public class CatcherPortlet extends GenericPortlet {

public void init() throws PortletException {

viewJSP = getInitParameter("view-jsp");

}

public void doView(RenderRequest req, RenderResponse res)

throws IOException, PortletException {

include(viewJSP, req, res);

}

protected void include(String path, RenderRequest req, RenderResponse res)

throws IOException, PortletException {

PortletRequestDispatcher prd = getPortletContext()

.getRequestDispatcher(path);

if (prd == null) {

_log.error(path + " is not a valid include");

} else {

prd.include(req, res);

}

}

@ProcessEvent(qname = "{http://liferay.com/events}ipc.pitch")

public void catchBall(EventRequest request, EventResponse response) {

Event event = request.getEvent();

String pitch = (String) event.getValue();

System.out.println(pitch+"In class");

response.setRenderParameter("pitch", pitch);

}

protected String viewJSP;

private static Log _log = LogFactory.getLog(PitcherPortlet.class);

}

12. Under docroot/src create a class PitchPortlet.java

package com.plugin.portlet;

import java.io.IOException;

import javax.portlet.ActionRequest;

import javax.portlet.ActionResponse;

import javax.portlet.GenericPortlet;

import javax.portlet.PortletException;

import javax.portlet.PortletMode;

import javax.portlet.PortletPreferences;

import javax.portlet.PortletRequestDispatcher;

import javax.portlet.PortletURL;

import javax.portlet.RenderRequest;

import javax.portlet.RenderResponse;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import javax.portlet.EventRequest;

import javax.portlet.Event;

import javax.portlet.EventResponse;

import javax.portlet.*;

import java.util.Random;

import javax.xml.namespace.QName;

public class PitcherPortlet extends GenericPortlet {

public void init() throws PortletException {

viewJSP = getInitParameter("view-jsp");

}

public void doView(RenderRequest req, RenderResponse res)

throws IOException, PortletException {

include(viewJSP, req, res);

}

protected void include(String path, RenderRequest req, RenderResponse res)

throws IOException, PortletException {

PortletRequestDispatcher prd = getPortletContext()

.getRequestDispatcher(path);

if (prd == null) {

_log.error(path + " is not a valid include");

} else {

prd.include(req, res);

}

}

@ProcessAction(name = "pitchBall")

public void pitchBall(ActionRequest request, ActionResponse response) {

String pitchType = null;

// Send an Event that the ball has been pitched.

Random random = new Random(System.currentTimeMillis());

int pitch = random.nextInt(3) + 1;

switch (pitch) {

case 1:

pitchType = "Fast Ball";

break;

case 2:

pitchType = "Curve Ball";

break;

case 3:

pitchType = "Slider";

break;

// should never print

default:

pitchType = "Screw Ball";

}

QName qName = new QName("http://liferay.com/events", "ipc.pitch");

System.out.println(pitchType+"");

response.setEvent(qName, pitchType);

}

protected String viewJSP;

private static Log _log = LogFactory.getLog(PitcherPortlet.class);

}

13. Compile and deploy the portlet.