WSDL - Asyn Callback service | Asyn BPEL WSDL vs Sync BPEL WSDL

Asyn callback users Wsdl file:

<?xml version="1.0" encoding="UTF-8"?>

<wsdl:definitions name="UserWSDL" targetNamespace="http://xmlns.oracle.com/Application1/Project1/UserWSDL" xmlns:tns="http://xmlns.oracle.com/Application1/Project1/UserWSDL"  xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:inp1="http://www.example.org">

<wsdl:types>

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:emp="http://www.example.org" targetNamespace="http://www.example.org" elementFormDefault="qualified">

<xsd:element name="Users">

<xsd:complexType>

<xsd:sequence>

<xsd:element name="User" maxOccurs="unbounded">

<xsd:complexType>

<xsd:sequence>

<xsd:element name="id" type="xsd:integer"/>

<xsd:element name="firstName" type="xsd:string"/>

<xsd:element name="lastName" type="xsd:string"/>

<xsd:element name="email" type="xsd:string"/>

<xsd:element name="country" type="xsd:string"/>

</xsd:sequence>

</xsd:complexType>

</xsd:element>

</xsd:sequence>

</xsd:complexType>

</xsd:element>

<xsd:element name="CallBackStatus">

<xsd:complexType>

<xsd:sequence>

<xsd:element name="Status" type ="xsd:string"/>

</xsd:sequence>

</xsd:complexType>

</xsd:element>

</xsd:schema>

</wsdl:types>

<wsdl:message name="requestMessgae">

<wsdl:part name="payload" element="inp1:Users"/>

</wsdl:message>

<wsdl:message name="callbackMessgae">

<wsdl:part name="payload" element="inp1:CallBackStatus"/>

</wsdl:message>

<wsdl:portType name="UserServicePort">

<wsdl:operation name="UserGetOP">

<wsdl:input message="tns:requestMessage"/>

</wsdl:operation>

</wsdl:portType>

<wsdl:portType name="callbackstatus_ptt">

<wsdl:operation name="callbackstatus">

<wsdl:input message="tns:callbackMessage"/>

</wsdl:operation>

</wsdl:portType>

</wsdl:definitions>

Async BPEL WSDL vs Sync BPEL WSDL:

Sync BPEL:

In SOA if our bpel is of synchronous type then we can make only synchronous calls and for which we will get the response immediately, So this case BPEL wsdl contains single port having two operations (request, response) in it.

Asyn BPEL:

If our BPEL is of asynchronous type then we can make sync and async calls. This case BPEL wsdl contains two ports having separate operations request, response. Here we need to observe one thing is if the response/callback takes long time then we should use separate port.