The middleware for Intelehealth is developed using Java. The below libraries are used,
Maven – This is a build tool which can be used to import the correct version of jar files, compile and deploy the war.The config file for this is POM.xml which is present in the EMR-Middleware folder
Jersey - Jersey RESTful Web Services framework is open source, production quality, framework for developing RESTful Web Services in Java that provides support for JAX-RS APIs.
SL4J – This library is used for logging
Mybatis – This is a persistence framework. It automates the mapping between sql and objects.
Gson – This library is used to convert an object to a json string and vice-versa
Retrofit - It makes it relatively easy to retrieve and upload JSON (or other structured data) via a REST based webservice.
Purpose of middleware
The purpose of the middleware is to pull and push data from and to the OpenMRS platform to avoid multiple requests from the client to the OpenMRS platform server. It consists of 2 API’s - the Pull Data API and Push Data API. For both API’s basic authorization credentials also should be passed.
Pull Data
This is a GET request , the url is given as below
http://host:port/EMR-Middleware/webapi/pull/pulldata/{locationuuid}/{lastpulltime}
locationuuid and the lastpulltime is the input paramters this API expects.This API will pull the following parameters based on the location and last created or modified time:
Patientlist,patientAttributeTypeListMater,patientAttributesList,VisitList,encounterList,obslist,locationlist,providerlist,providerAttributeTypeList,providerAttributeList,visitAttributeTypeList, and VisitAttributeList
Push Data
This is a post request.The url is given below
http://host:port/EMR-Middleware/webapi/push/pushdata
This expects the application/json structure as the input.The sample is given below.
{
"persons": [
{
"uuid": "8ee4484b-8718-45c8-8e41-8b9d3ce28e4f",
"gender": "M",
"names": [
{
"givenName": "KennethIDGEN",
"middleName": "",
"familyName": "George"
}
],
"birthdate": "1955-02-06",
"attributes": [
{
"attributeType": "14d4f066-15f5-102d-96e4-000c29c2a5d7",
"value": ""
},
{
"attributeType": "5a889d96-0c84-4a04-88dc-59a6e37db2d3",
"value": "OBC"
},
{
"attributeType": "f4af0ef3-579c-448a-8157-750283409122",
"value": "APL"
},
{
"attributeType": "1c718819-345c-4368-aad6-d69b4c267db7",
"value": "Primary"
},
{
"attributeType": "1b2f34f7-2bf8-4ef7-9736-f5b858afc160",
"value": ""
},
{
"attributeType": "ecdaadb6-14a0-4ed9-b5b7-cfed87b44b87",
"value": ""
}
],
"addresses": [
{
"address1": "",
"address2": "",
"cityVillage": "Bengalurur",
"stateProvince": "Karantaka",
"country": "India",
"postalCode": "560043"
}
]
}
],
"patients": [
{
"person": "8ee4484b-8718-45c8-8e41-8b9d3ce28e4f",
"identifiers": [
{
"identifierType": "05a29f94-c0ed-11e2-94be-8c13b969e334",
"location": "b56d5d16-bf89-4ac0-918d-e830fbfba290",
"preferred": true
}
]
}
],
"visits": [
{
"uuid": "ef4fd44b-42cb-437d-9464-6d9109c2f281",
"startDatetime": "2019-02-06T12:44:34.662+0530",
"visitType": "a86ac96e-2e07-47a7-8e72-8216a1a75bfd",
"patient": "8ee4484b-8718-45c8-8e41-8b9d3ce28e4f",
"location": "b56d5d16-bf89-4ac0-918d-e830fbfba290"
}
],
"encounters": [
{
"uuid": "0eae3430-c7c6-40d5-a2c4-d128480a91b8",
"encounterDatetime": "2019-02-06T12:44:34.662+0530",
"patient": "ffc30b9b-0de9-4c10-95e5-227043c8b45b",
"encounterType": "67a71486-1a54-468f-ac3e-7091a9a79584",
"visit": "5b72525f-f553-4557-b7b1-06801ab2aad9",
"obs": [
{
"concept": "5089AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
"value": 4
},
{
"concept": "5090AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
"value": 25
},
{
"concept": "5085AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
"value": 80
},
{
"concept": "5086AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
"value": 110
}
],
"encounterProviders": [
{
"encounterRole": "73bbb069-9781-4afc-a9d1-54b6b2270e04",
"provider": "163b48e5-26fb-40c1-8d94-a6c873dd2869"
}
],
"location": "b56d5d16-bf89-4ac0-918d-e830fbfba290"
},
{
"uuid":"c3a5747f-607d-4115-a59e-c2280a0b56d5",
"encounterDatetime": "2019-02-06T12:44:34.662+0530",
"patient": "ffc30b9b-0de9-4c10-95e5-227043c8b45b",
"encounterType": "8d5b27bc-c2cc-11de-8d13-0010c6dffd0f",
"visit": "5b72525f-f553-4557-b7b1-06801ab2aad9",
"obs": [
{
"concept": "62bff84b-795a-45ad-aae1-80e7f5163a82",
"value": "• Pregnancy status - Not pregnant.<br/>• Alcohol use - Yes - Number of drinks consumed in one go - 3-4.<br/>"
},
{
"concept": "d63ae965-47fb-40e8-8f08-1f46a8a60b2b",
"value": "•Diabetes : Mother.<br/>"
},
{
"concept": "3edb0e09-9135-481e-b8f0-07a26fa9a5ce",
"value": "►<b>Fever</b>: <br/>• Duration - since 5 Hours.<br/> "
},
{
"concept": "e1761e85-9b50-48ae-8c4d-e6b7eeeba084",
"value": "<b>General exams: </b><br/>• Eyes: Jaundice-no jaundice seen. <br/>• Eyes: Pallor-normal pallor. <br/>• Arm-Pinch skin - appears slow on pinch test. <br/>• Nail abnormality-clubbing. <br/>• Nail anemia-Nails are not pale. <br/>• Ankle-pedal oedema in left foot. <br/><b>Any Location: </b><br/>• Skin Rash:-no rash. <br/>• Ulcer:-no ulcer. <br/><b>Mouth: </b><br/>• back of throat normal. <br/><b>Abdomen: </b><br/>• tenderness seen - location - Middle(C)."
}
],
"encounterProviders": [
{
"encounterRole": "73bbb069-9781-4afc-a9d1-54b6b2270e04",
"provider": "163b48e5-26fb-40c1-8d94-a6c873dd2869"
}
],
"location": "b56d5d16-bf89-4ac0-918d-e830fbfba290"
}
]
}
This data is pushed to the middleware and in turn calls the relevant OpenMRS API’s to add/edit patient, visits, encounters and observations. If each of the object succeeds or fails it returns the uuid and whether that object has synced or not. This sync value will be updated in the android db , so that if an object has not syncd succeessfully it will resend that object in the next try.