How to copy data across multiple branches of Multicast in SAP CPI

[Sriprasadsbhat]

Introduction:

Recently came across multiple SCN threads looking for how to copy the data across multiple branches of Multicast in SAP CPI, so this is how we can achieve the same with small example using HashMap.

Scenario:

We will be creating below sample scenario where we are passing some test data to multiple branches where each branch has its own set of transformations based on some key value and at the end of the Message processing data from both the branches needs to be merged and sent to Target side.

Step 1:

Content modifier with sample data.

<Root>

	<Record>

		<Field1>F1</Field1>

		<Condition>X</Condition>

		<Field2>F2</Field2>

		<Field3>3</Field3>

	</Record>

	<Record>

		<Field1>F11</Field1>

		<Condition>X</Condition>

		<Field2>F21</Field2>

		<Field3>31</Field3>

	</Record>

	<Record>

		<Field1>F12</Field1>

		<Condition>Y</Condition>

		<Field2>F22</Field2>

		<Field3>32</Field3>

	</Record>

	<Record>

		<Field1>F13</Field1>

		<Condition>X</Condition>

		<Field2>F23</Field2>

		<Field3>33</Field3>

	</Record>

	<Record>

		<Field1>F14</Field1>

		<Condition>Y</Condition>

		<Field2>F24</Field2>

		<Field3>34</Field3>

	</Record>

	<Record>

		<Field1>F15</Field1>

		<Condition>N</Condition>

		<Field2>F25</Field2>

		<Field3>345</Field3>

	</Record>

	<Record>

		<Field1>F16</Field1>

		<Condition>N</Condition>

		<Field2>F26</Field2>

		<Field3>346</Field3>

	</Record>

</Root>

Step 2:

Script to initiate the Hash Map which is used in both the branches.

Script:

import com.sap.gateway.ip.core.customdev.util.Message;

import java.util.HashMap;



def Message processData(Message message) {

    //Body 

     def body = message.getBody();

     def str=body.toString()

    //Initiate HashMap and assign it to Header   

     HashMap<String, String> hmap1 = new HashMap<String, String>();

     message.setHeader("cacheEntity",hmap1);  

  

   return message;

}

Step 3:

Content filter which filters certain set of data in my case data having Condition field value "X".

Step 4:

In my case I will not be doing much transformation so storing the data after filter into hash map which can be used in second branch.Below Script pulls the hash map that was initialized in Step 2 and overwrites the content of it.

Script:

import com.sap.gateway.ip.core.customdev.util.Message;

import java.util.HashMap;



def Message processData(Message message) {

    //Body 

       def body = message.getBody();

       def str=body.toString()

	   

        def map = message.getHeaders();

	//Get initialized cached entity form Header

	HashMap<String, String> cacheData = map.get("cacheEntity");

	cacheData.put("Branch1",str)

	message.setHeader("cacheEntity",cacheData);

	return message;

}

Step 5:

Content filter which filters certain set of data in my case data having Condition field value "Y".

Step 6:

Now we have second branch data ready and need to send the data from both the branch together to target system.Below script will do the concatenation of both the data( one set from Branch Y and another from Branch X ).

Script:

import com.sap.gateway.ip.core.customdev.util.Message;

import java.util.HashMap;

def Message processData(Message message) {

    //Body 

    def body = message.getBody();

    def map = message.getHeaders();

    def output = map.get("cacheEntity");

    def value=output.get("Branch1")

    def TargetData = "<Output>"+body+value+"<\\Output>"

    

    message.setBody(TargetData);

    return message;

}

Output Generated:

<Output>

	<Root>

		<Record>

			<Field1>F12</Field1>

			<Condition>Y</Condition>

			<Field2>F22</Field2>

			<Field3>32</Field3>

		</Record>

		<Record>

			<Field1>F14</Field1>

			<Condition>Y</Condition>

			<Field2>F24</Field2>

			<Field3>34</Field3>

		</Record>

	</Root>

	<Root>

		<Record>

			<Field1>F1</Field1>

			<Condition>X</Condition>

			<Field2>F2</Field2>

			<Field3>3</Field3>

		</Record>

		<Record>

			<Field1>F11</Field1>

			<Condition>X</Condition>

			<Field2>F21</Field2>

			<Field3>31</Field3>

		</Record>

		<Record>

			<Field1>F13</Field1>

			<Condition>X</Condition>

			<Field2>F23</Field2>

			<Field3>33</Field3>

		</Record>

	</Root>

	<\Output>

Conclusion:

Since the headers or properties set in first branch not accessible in second or further branches above solution will help to overcome that issue.

Thanks to engswee.yeoh  for the wonderful blog where he explains the above behavior with below Conclusion.This still holds good for my blog also.!

Header/Property Object Type	Created In	Accessible in Subsequent Branch	Modifications in Predecessor Branch seen in Subsequent Branch
java.lang.String	Main route	Yes	No
java.util.HashMap	Main route	Yes	Yes
Any	Multicast branch	No	N/A

Thanks tirumareddy.praveen for your as usual great support:)

Hope this helps SAP CPI beginners!

Regards,

Sriprasad Shivaram Bhat