Implement Deallocate RAN NSSI Workflow

Issue-ID: SO-3230
Signed-off-by: Priyadharshini <priyadharshini.b96@wipro.com>
Change-Id: I37ce7d21eaba8ea60a91a7034501211b2cf3a987

1 files changed, 556 insertions, 0 deletions

diff --git a/bpmn/so-bpmn-infrastructure-common/src/main/groovy/org/onap/so/bpmn/infrastructure/scripts/DoDeAllocateAccessNSSI.groovy b/bpmn/so-bpmn-infrastructure-common/src/main/groovy/org/onap/so/bpmn/infrastructure/scripts/DoDeAllocateAccessNSSI.groovy
new file mode 100644
index 0000000000..2ca0da4cbb
--- /dev/null
+++ b/bpmn/so-bpmn-infrastructure-common/src/main/groovy/org/onap/so/bpmn/infrastructure/scripts/DoDeAllocateAccessNSSI.groovy
@@ -0,0 +1,556 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - SO
+ * ================================================================================
+ * Copyright (C) 2020 Wipro Limited. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License")
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.so.bpmn.infrastructure.scripts
+
+import static org.apache.commons.lang3.StringUtils.isBlank
+
+import javax.ws.rs.NotFoundException
+import javax.ws.rs.core.Response
+
+import org.camunda.bpm.engine.delegate.BpmnError
+import org.camunda.bpm.engine.delegate.DelegateExecution
+import org.onap.aai.domain.yang.*
+import org.onap.aaiclient.client.aai.AAIObjectType
+import org.onap.aaiclient.client.aai.AAIResourcesClient
+import org.onap.aaiclient.client.aai.entities.AAIResultWrapper
+import org.onap.aaiclient.client.aai.entities.uri.AAIResourceUri
+import org.onap.aaiclient.client.aai.entities.uri.AAIUriFactory
+import org.onap.logging.filter.base.ONAPComponents
+import org.onap.so.beans.nsmf.DeAllocateNssi
+import org.onap.so.beans.nsmf.EsrInfo
+import org.onap.so.beans.nsmf.ServiceInfo
+import org.onap.so.bpmn.common.scripts.AbstractServiceTaskProcessor
+import org.onap.so.bpmn.common.scripts.ExceptionUtil
+import org.onap.so.bpmn.common.scripts.NssmfAdapterUtils
+import org.onap.so.bpmn.common.scripts.OofUtils
+import org.onap.so.bpmn.common.scripts.RequestDBUtil
+import org.onap.so.bpmn.core.UrnPropertiesReader
+import org.onap.so.bpmn.core.json.JsonUtils
+import org.onap.so.client.HttpClient
+import org.onap.so.client.HttpClientFactory
+import org.onap.so.client.oof.adapter.beans.payload.OofRequest
+import org.onap.so.db.request.beans.ResourceOperationStatus
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
+
+import com.fasterxml.jackson.databind.ObjectMapper
+import com.google.gson.JsonObject
+
+/**
+ * Internal AN NSSMF to handle NSSI Deallocation
+ */
+class DoDeAllocateAccessNSSI extends AbstractServiceTaskProcessor {
+
+	String Prefix="DoDeAllocateAccessNSSI"
+	ExceptionUtil exceptionUtil = new ExceptionUtil()
+	RequestDBUtil requestDBUtil = new RequestDBUtil()
+	JsonUtils jsonUtil = new JsonUtils()
+	OofUtils oofUtils = new OofUtils()
+	ObjectMapper objectMapper = new ObjectMapper()
+	private NssmfAdapterUtils nssmfAdapterUtils = new NssmfAdapterUtils(httpClientFactory, jsonUtil)
+	
+	private static final Logger logger = LoggerFactory.getLogger(DoDeAllocateAccessNSSI.class)
+	private static final String ROLE_SLICE_PROFILE = "slice-profile-instance"
+	private static final String ROLE_NSSI = "nssi"
+
+	private static final String AN_NF = "AN-NF"
+	private static final String TN_FH = "TN-FH"
+	private static final String TN_MH = "TN-MH"
+
+	@Override
+	public void preProcessRequest(DelegateExecution execution) {
+		logger.debug("${Prefix} - Start preProcessRequest")
+
+		String sliceParams = execution.getVariable("sliceParams")
+		String sNssaiList = jsonUtil.getJsonValue(sliceParams, "snssaiList")
+		String anSliceProfileId = jsonUtil.getJsonValue(sliceParams, "sliceProfileId")
+		String nsiId = jsonUtil.getJsonValue(sliceParams, "nsiId")
+		String globalSubscriberId = execution.getVariable("globalSubscriberId")
+		String subscriptionServiceType = execution.getVariable("subscriptionServiceType")
+		String anNssiId = execution.getVariable("serviceInstanceID")
+
+		if(isBlank(sNssaiList) || isBlank(anSliceProfileId) || isBlank(nsiId)) {
+			String msg = "Input fields cannot be null : Mandatory attributes : [snssaiList, sliceProfileId, nsiId]"
+			logger.debug(msg)
+			exceptionUtil.buildAndThrowWorkflowException(execution, 500, msg)
+		}
+
+		if( isBlank(anNssiId) || isBlank(globalSubscriberId) || isBlank(subscriptionServiceType)) {
+			String msg = "Missing Input fields from main process : [serviceInstanceID, globalSubscriberId, subscriptionServiceType]"
+			logger.debug(msg)
+			exceptionUtil.buildAndThrowWorkflowException(execution, 500, msg)
+		}
+
+		execution.setVariable("sNssaiList", sNssaiList)
+		execution.setVariable("anSliceProfileId", anSliceProfileId)
+		execution.setVariable("nsiId", nsiId)
+		execution.setVariable("anNssiId", anNssiId)
+
+		logger.debug("${Prefix} - Preprocessing completed with sliceProfileId : ${anSliceProfileId} , nsiId : ${nsiId} , nssiId : ${anNssiId}")
+	}
+
+	/**
+	 * Method to fetch AN NSSI Constituents and Slice Profile constituents
+	 * @param execution
+	 */
+	void getRelatedInstances(DelegateExecution execution) {
+		logger.debug("${Prefix} - Get Related Instances")
+		String anSliceProfileId = execution.getVariable("anSliceProfileId")
+		String anNssiId = execution.getVariable("anNssiId")
+
+		Map<String,ServiceInstance> relatedSPs = new HashMap<>()
+		execution.setVariable("relatedSPs", getRelatedInstancesByRole(execution, ROLE_SLICE_PROFILE, anSliceProfileId))
+		execution.setVariable("anNfSliceProfileId", getInstanceIdByWorkloadContext(execution.getVariable("relatedSPs"), AN_NF))
+
+		Map<String,ServiceInstance> relatedNssis = new HashMap<>()
+		execution.setVariable("relatedNssis", getRelatedInstancesByRole(execution, ROLE_NSSI, anNssiId))
+	}
+	
+
+	/**
+	 * @param execution
+	 */
+	void prepareOOFAnNssiTerminationRequest(DelegateExecution execution) {
+		logger.debug("Start prepareOOFTerminationRequest")
+        String requestId = execution.getVariable("msoRequestId")
+		String messageType = "AN_NSSITermination"
+		String timeout = UrnPropertiesReader.getVariable("mso.adapters.oof.timeout", execution);
+		String serviceInstanceId = execution.getVariable("nsiId")
+		String anNssiId = execution.getVariable("anNssiId")
+        String oofRequest = oofUtils.buildTerminateNxiRequest(requestId,anNssiId, ROLE_NSSI,messageType,serviceInstanceId)
+        OofRequest oofPayload = new OofRequest()
+		oofPayload.setApiPath("/api/oof/terminate/nxi/v1")
+		oofPayload.setRequestDetails(oofRequest)
+		execution.setVariable("oofAnNssiPayload", oofPayload)
+        logger.debug("Finish prepareOOFTerminationRequest")
+
+	}
+	
+	void performOofAnNSSITerminationCall(DelegateExecution execution) {
+		boolean terminateAnNSSI = callOofAdapter(execution,execution.getVariable("oofAnNssiPayload"))
+		execution.setVariable("terminateAnNSSI", terminateAnNSSI)
+	}
+	
+	/**
+	 * @param execution
+	 */
+	void prepareOOFAnNfNssiTerminationRequest(DelegateExecution execution) {
+		logger.debug("Start prepareOOFAnNfNssiTerminationRequest")
+		String requestId = execution.getVariable("msoRequestId")
+		String messageType = "AN_NF_NSSITermination"
+		String timeout = UrnPropertiesReader.getVariable("mso.adapters.oof.timeout", execution);
+		String serviceInstanceId = execution.getVariable("anNssiId")
+
+		String anNfNssiId = getInstanceIdByWorkloadContext(execution.getVariable("relatedNssis"),AN_NF)
+		execution.setVariable("anNfNssiId", anNfNssiId)
+
+		String oofRequest = oofUtils.buildTerminateNxiRequest(requestId,anNfNssiId, ROLE_NSSI,messageType,serviceInstanceId)
+		OofRequest oofPayload = new OofRequest()
+		oofPayload.setApiPath("/api/oof/terminate/nxi/v1")
+		oofPayload.setRequestDetails(oofRequest)
+		execution.setVariable("oofAnNfNssiPayload", oofPayload)
+		logger.debug("Finish prepareOOFAnNfNssiTerminationRequest")
+
+	}
+
+	void performOofAnNfNSSITerminationCall(DelegateExecution execution) {
+		boolean terminateAnNfNSSI = callOofAdapter(execution,execution.getVariable("oofAnNfNssiPayload"))
+		execution.setVariable("terminateAnNfNSSI", terminateAnNfNSSI)
+		if(!terminateAnNfNSSI) {
+			execution.setVariable("modifyAction",true)
+		}
+	}
+	
+	void prepareSdnrRequest(DelegateExecution execution) {
+
+		String anNfNssiId = execution.getVariable("anNfNssiId")
+		String sNssai = execution.getVariable("sNssaiList")
+		String reqId = execution.getVariable("msoRequestId")
+		String messageType = "SDNRTerminateResponse"
+		StringBuilder callbackURL = new StringBuilder(UrnPropertiesReader.getVariable("mso.workflow.message.endpoint", execution))
+		callbackURL.append("/").append(messageType).append("/").append(reqId)
+
+		JsonObject input = new JsonObject()
+		input.addProperty("RANNFNSSIId", anNfNssiId)
+		input.addProperty("callbackURL", callbackURL.toString())
+		input.addProperty("s-NSSAI", sNssai)
+
+		JsonObject Payload = new JsonObject()
+		Payload.addProperty("version", "1.0")
+		Payload.addProperty("rpc-name", "TerminateRANSlice")
+		Payload.addProperty("correlation-id", reqId)
+		Payload.addProperty("type", "request")
+
+		JsonObject wrapinput = new JsonObject()
+		wrapinput.addProperty("Action", "deallocate")
+
+		JsonObject CommonHeader = new JsonObject()
+		CommonHeader.addProperty("TimeStamp", new Date(System.currentTimeMillis()).format("yyyy-MM-ddTHH:mm:ss.sss", TimeZone.getDefault()))
+		CommonHeader.addProperty("APIver", "1.0")
+		CommonHeader.addProperty("RequestID", reqId)
+		CommonHeader.addProperty("SubRequestID", "1")
+
+		JsonObject body = new JsonObject()
+		body.add("input", wrapinput)
+
+		JsonObject sdnrRequest = new JsonObject()
+		Payload.add("input", input)
+		wrapinput.add("Payload", Payload)
+		wrapinput.add("CommonHeader", CommonHeader)
+		body.add("input", wrapinput)
+		sdnrRequest.add("body", body)
+
+		String json = sdnrRequest.toString()
+		execution.setVariable("sdnrRequest", sdnrRequest)
+		execution.setVariable("SDNR_messageType", messageType)
+		execution.setVariable("SDNR_timeout", "PT10M")
+
+	}
+	
+	void processSdnrResponse(DelegateExecution execution) {
+		logger.debug("${Prefix} processing SdnrResponse")
+		Map<String, Object> resMap = objectMapper.readValue(execution.getVariable("SDNR_Response"),Map.class)
+		String status = resMap.get("status")
+		String reason = resMap.get("reason")
+		if("success".equalsIgnoreCase(status)) {
+			execution.setVariable("isAnNfTerminated", true)
+		}else {
+			execution.setVariable("isAnNfTerminated", false)
+			logger.debug("AN NF Termination failed with reason ${reason}")
+		}
+		logger.debug("${Prefix} processed SdnrResponse")
+	}
+	
+	/**
+	 * @param execution
+	 * @param oofRequest - Request payload to be sent to adapter
+	 * @return
+	 */
+	boolean callOofAdapter(DelegateExecution execution, OofRequest oofRequest) {
+		logger.debug("Start callOofAdapter")
+		String requestId = execution.getVariable("msoRequestId")
+		String oofAdapterEndpoint = UrnPropertiesReader.getVariable("mso.adapters.oof.endpoint", execution)
+		URL requestUrl = new URL(oofAdapterEndpoint)
+		logger.debug("Calling OOF adapter  : ${requestUrl} with payload : ${oofRequest}")
+		HttpClient httpClient = new HttpClientFactory().newJsonClient(requestUrl, ONAPComponents.EXTERNAL)
+		Response httpResponse = httpClient.post(oofRequest)
+		int responseCode = httpResponse.getStatus()
+		logger.debug("OOF sync response code is: " + responseCode)
+		if(responseCode != 200){
+			logger.debug("OOF request failed with reason : " + httpResponse)
+			exceptionUtil.buildAndThrowWorkflowException(execution, responseCode, "Received a Bad Sync Response from OOF.")
+		}else {
+			Map<String,Object> response = objectMapper.readValue(httpResponse.getEntity(),Map.class)
+			boolean terminateResponse =  response.get("terminateResponse")
+			if(!terminateResponse) {
+				logger.debug("Terminate response is false because " + response.get("reason"))
+			}
+			return terminateResponse
+		}
+	}
+	
+	void deallocateAnNfNssi(DelegateExecution execution) {
+		logger.debug("${Prefix} - call deallocateAnNfNssi ")
+		String anNfNssiId = getInstanceIdByWorkloadContext(execution.getVariable("relatedNssis"), AN_NF)
+		String globalSubscriberId = execution.getVariable("globalSubscriberId")
+		String subscriptionServiceType = execution.getVariable("subscriptionServiceType")
+
+		AAIResourcesClient client = new AAIResourcesClient()
+		AAIResourceUri uri = AAIUriFactory.createResourceUri(AAIObjectType.SERVICE_INSTANCE,
+				globalSubscriberId, subscriptionServiceType, anNfNssiId)
+		if (!client.exists(uri)) {
+			logger.debug("AN NF Service Instance was not found in aai : ${anNfNssiId}")
+		}else {
+			client.delete(uri)
+		}
+	}
+	
+	/**
+	 * Removes relationship between AN NSSI and AN_NF NSSI
+	 * @param execution
+	 */
+	void dissociateAnNfNssi(DelegateExecution execution) {
+		logger.debug("${Prefix} - call dissociateAnNfNssi ")
+		String anNfNssiId = getInstanceIdByWorkloadContext(execution.getVariable("relatedNssis"), AN_NF)
+		String globalSubscriberId = execution.getVariable("globalSubscriberId")
+		String subscriptionServiceType = execution.getVariable("subscriptionServiceType")
+
+		AAIResourcesClient client = new AAIResourcesClient()
+		AAIResourceUri uri = AAIUriFactory.createResourceUri(AAIObjectType.SERVICE_INSTANCE,
+				globalSubscriberId, subscriptionServiceType, anNfNssiId)
+		if (!client.exists(uri)) {
+			logger.debug("AN NF Service Instance was not found in aai : ${anNfNssiId}")
+		}else {
+			client.delete(uri)
+		}
+	}
+	
+	/**
+	 * Method to prepare request for AN NSSI modification
+	 * Call Modify AN NSSI in case OOF sends Terminate NSSI=False
+	 * @param execution
+	 */
+	void preparejobForANNSSIModification(DelegateExecution execution) {
+
+		String modificationJobId = UUID.randomUUID().toString()
+		execution.setVariable("modificationJobId", modificationJobId)
+
+		Map<String,Object> sliceParams = objectMapper.readValue(execution.getVariable("sliceParams"), Map.class)
+		sliceParams.put("modifyAction", "deallocate")
+		execution.setVariable("modificationsliceParams", sliceParams)
+
+		String serviceId = execution.getVariable("serviceInstanceId")
+		String nsiId = execution.getVariable("nsiId")
+		logger.debug("Generated new job for Service Instance serviceId:" + serviceId + " operationId:" + modificationJobId)
+
+		ResourceOperationStatus initStatus = new ResourceOperationStatus()
+		initStatus.setServiceId(serviceId)
+		initStatus.setOperationId(modificationJobId)
+		initStatus.setResourceTemplateUUID(nsiId)
+		initStatus.setOperType("Modify-Deallocate")
+		requestDBUtil.prepareInitResourceOperationStatus(execution, initStatus)
+
+		logger.debug(Prefix + "prepareInitOperationStatus Exit")
+	}
+
+	void prepareQueryJobStatus(DelegateExecution execution,String jobId,String networkType,String instanceId) {
+
+		String responseId = "1"
+		String globalSubscriberId = execution.getVariable("globalSubscriberId")
+		String subscriptionServiceType = execution.getVariable("subscriptionServiceType")
+
+		EsrInfo esrInfo = new EsrInfo()
+		esrInfo.setNetworkType(networkType)
+		esrInfo.setVendor("ONAP")
+
+		ServiceInfo serviceInfo = new ServiceInfo()
+		serviceInfo.setNssiId(instanceId)
+		serviceInfo.setNsiId(execution.getVariable("nsiId"))
+		serviceInfo.setGlobalSubscriberId(globalSubscriberId)
+		serviceInfo.setSubscriptionServiceType(subscriptionServiceType)
+
+		execution.setVariable("${networkType}_esrInfo", esrInfo)
+		execution.setVariable("${networkType}_responseId", responseId)
+		execution.setVariable("${networkType}_serviceInfo", serviceInfo)
+
+	}
+
+	void validateJobStatus(DelegateExecution execution,String responseDescriptor) {
+		logger.debug("validateJobStatus ${responseDescriptor}")
+		String status = jsonUtil.getJsonValue(responseDescriptor, "responseDescriptor.status")
+		String statusDescription = jsonUtil.getJsonValue(responseDescriptor, "responseDescriptor.statusDescription")
+		if("finished".equalsIgnoreCase(status)) {
+			execution.setVariable("isSuccess", true)
+		}else {
+			execution.setVariable("isSuccess", false)
+		}
+	}
+	
+	void prepareUpdateJobStatus(DelegateExecution execution,String status,String progress,String statusDescription) {
+		String serviceId = execution.getVariable("anNssiId")
+		String jobId = execution.getVariable("jobId")
+		String nsiId = execution.getVariable("nsiId")
+
+		ResourceOperationStatus roStatus = new ResourceOperationStatus()
+		roStatus.setServiceId(serviceId)
+		roStatus.setOperationId(jobId)
+		roStatus.setResourceTemplateUUID(nsiId)
+		roStatus.setOperType("DeAllocate")
+		roStatus.setProgress(progress)
+		roStatus.setStatus(status)
+		roStatus.setStatusDescription(statusDescription)
+		requestDBUtil.prepareUpdateResourceOperationStatus(execution, status)
+	}
+	
+	void terminateTNFHNssi(DelegateExecution execution) {
+		logger.debug("Start terminateTNFHNssi in ${Prefix}")
+		String nssmfRequest = buildDeallocateNssiRequest(execution, TN_FH)
+		String nssiId = getInstanceIdByWorkloadContext(execution.getVariable("relatedNssis"), TN_FH)
+		execution.setVariable("tnFHNSSIId", nssiId)
+		String urlString = "/api/rest/provMns/v1/NSS/nssi/" + nssiId
+				String nssmfResponse = nssmfAdapterUtils.sendPostRequestNSSMF(execution, urlString, nssmfRequest)
+				if (nssmfResponse != null) {
+					String jobId = jsonUtil.getJsonValue(nssmfResponse, "jobId")
+					execution.setVariable("TN_FH_jobId",jobId)
+				} else {
+					logger.error("received error message from NSSMF : "+ nssmfResponse)
+					exceptionUtil.buildAndThrowWorkflowException(execution, 7000,"Received a Bad Sync Response from NSSMF.")
+				}
+				logger.debug("Exit terminateTNFHNssi in ${Prefix}")
+	}
+	
+	void terminateTNMHNssi(DelegateExecution execution) {
+		logger.debug("Start terminateTNMHNssi in ${Prefix}")
+		String nssmfRequest = buildDeallocateNssiRequest(execution, TN_MH)
+		String nssiId = getInstanceIdByWorkloadContext(execution.getVariable("relatedNssis"), TN_MH)
+		execution.setVariable("tnMHNSSIId", nssiId)
+		String urlString = "/api/rest/provMns/v1/NSS/nssi/" + nssiId
+				String nssmfResponse = nssmfAdapterUtils.sendPostRequestNSSMF(execution, urlString, nssmfRequest)
+				if (nssmfResponse != null) {
+					String jobId = jsonUtil.getJsonValue(nssmfResponse, "jobId")
+					execution.setVariable("TN_MH_jobId",jobId)
+				} else {
+					logger.error("received error message from NSSMF : "+ nssmfResponse)
+					exceptionUtil.buildAndThrowWorkflowException(execution, 7000,"Received a Bad Sync Response from NSSMF.")
+				}
+				logger.debug("Exit terminateTNMHNssi in ${Prefix}")
+	}
+	
+	void deleteRanNfSliceProfileInAAI(DelegateExecution execution) {
+		logger.debug("${Prefix} delete Ran NF SliceProfile In AAI")
+		String spId = execution.getVariable("anNfSliceProfileId")
+		deleteServiceInstanceInAAI(execution, spId)
+	}
+	
+	void deleteTNSliceProfileInAAI(DelegateExecution execution) {
+		logger.debug("${Prefix} delete TN FH SliceProfile In AAI")
+		String fhSP = getInstanceIdByWorkloadContext(execution.getVariable("relatedSPs"), TN_FH)
+		deleteServiceInstanceInAAI(execution, fhSP)
+		logger.debug("${Prefix} delete TN MH SliceProfile In AAI")
+		String mhSP = getInstanceIdByWorkloadContext(execution.getVariable("relatedSPs"), TN_MH)
+		deleteServiceInstanceInAAI(execution, mhSP)
+	}
+	
+	void deleteANNSSI(DelegateExecution execution) {
+		logger.debug("${Prefix} delete AN NSSI")
+		String nssiId = execution.getVariable("serviceInstanceID")
+		deleteServiceInstanceInAAI(execution, nssiId)
+	}
+	
+	/**
+	 * Fetches a collection of service instances with the specific role and maps it based on workload context
+	 * (AN-NF,TN-FH,TN-MH)
+	 * @param execution
+	 * @param role			- nssi/slice profile instance
+	 * @param instanceId	- id to which the related list to be found
+	 * @return
+	 */
+	private Map<String,ServiceInstance> getRelatedInstancesByRole(DelegateExecution execution,String role,String instanceId) {
+		logger.debug("${Prefix} - Fetching related ${role} from AAI")
+		String globalSubscriberId = execution.getVariable("globalSubscriberId")
+		String subscriptionServiceType = execution.getVariable("subscriptionServiceType")
+
+		if( isBlank(role) || isBlank(instanceId)) {
+			exceptionUtil.buildAndThrowWorkflowException(execution, 2500, "Role and instanceId are mandatory")
+		}
+
+		Map<String,ServiceInstance> relatedInstances = new HashMap<>()
+
+		AAIResourcesClient client = getAAIClient()
+		AAIResourceUri uri = AAIUriFactory.createResourceUri(AAIObjectType.SERVICE_INSTANCE,
+				globalSubscriberId, subscriptionServiceType, instanceId)
+		if (!client.exists(uri)) {
+			exceptionUtil.buildAndThrowWorkflowException(execution, 2500, "Service Instance was not found in aai : ${instanceId}")
+		}
+		AAIResultWrapper wrapper = client.get(uri, NotFoundException.class)
+		Optional<ServiceInstance> si = wrapper.asBean(ServiceInstance.class)
+		if(si.isPresent()) {
+		List<Relationship> relationshipList = si.get().getRelationshipList().getRelationship()
+		for (Relationship relationship : relationshipList) {
+			String relatedTo = relationship.getRelatedTo()
+			if (relatedTo.toLowerCase() == "service-instance") {
+				String relatioshipurl = relationship.getRelatedLink()
+				String serviceInstanceId =
+						relatioshipurl.substring(relatioshipurl.lastIndexOf("/") + 1, relatioshipurl.length())
+				uri = AAIUriFactory.createResourceUri(AAIObjectType.SERVICE_INSTANCE,
+						globalSubscriberId, subscriptionServiceType, serviceInstanceId)
+				if (!client.exists(uri)) {
+					exceptionUtil.buildAndThrowWorkflowException(execution, 2500,
+							"Service Instance was not found in aai: ${serviceInstanceId} related to ${instanceId}")
+				}
+				AAIResultWrapper wrapper01 = client.get(uri, NotFoundException.class)
+				Optional<ServiceInstance> serviceInstance = wrapper01.asBean(ServiceInstance.class)
+				if (serviceInstance.isPresent()) {
+					ServiceInstance instance = serviceInstance.get()
+					if (role.equalsIgnoreCase(instance.getServiceRole())) {
+						relatedInstances.put(instance.getWorkloadContext(),instance)
+					}
+				}
+			}
+		}
+		}
+		logger.debug("Found ${relatedInstances.size()} ${role} related to ${instanceId} ")
+		return relatedInstances
+	}
+	
+	private String getInstanceIdByWorkloadContext(Map<String,ServiceInstance> instances,String workloadContext ) {
+		String instanceId = instances.get(workloadContext).getServiceInstanceId()
+		if(instanceId == null) {
+			throw new BpmnError( 2500, "${workloadContext} NSSI ID is not found.")
+		}
+		return instanceId
+	}
+	
+	/**
+	 * Method to handle deallocation of RAN NSSI constituents(TN_FH/TN_MH)
+	 * @param execution
+	 * @param serviceFunction - TN_FH/TN_MH
+	 * @return
+	 */
+	private String buildDeallocateNssiRequest(DelegateExecution execution,String serviceFunction) {
+		String globalSubscriberId = execution.getVariable("globalSubscriberId")
+		String subscriptionServiceType = execution.getVariable("subscriptionServiceType")
+		Map<String, ServiceInstance> relatedNssis = execution.getVariable("relatedNssis")
+
+		String anNssiId = execution.getVariable("anNssiId")
+		List<String> sNssaiList =  execution.getVariable("sNssaiList")
+
+		Map<String, ServiceInstance> relatedSPs = execution.getVariable("relatedSPs")
+
+		DeAllocateNssi deallocateNssi = new DeAllocateNssi()
+		deallocateNssi.setNsiId(anNssiId)
+		ServiceInstance tnNssi = relatedNssis.get(serviceFunction)
+		String nssiId = tnNssi.getServiceInstanceId()
+
+		deallocateNssi.setNssiId(nssiId)
+		deallocateNssi.setScriptName(tnNssi.getServiceInstanceName())
+		deallocateNssi.setSnssaiList(sNssaiList)
+		deallocateNssi.setSliceProfileId(relatedSPs.get(serviceFunction).getServiceInstanceId())
+
+		EsrInfo esrInfo = new EsrInfo()
+		esrInfo.setVendor("ONAP")
+		esrInfo.setNetworkType("TN")
+
+		ServiceInfo serviceInfo = new ServiceInfo()
+		serviceInfo.setServiceInvariantUuid(tnNssi.getModelInvariantId())
+		serviceInfo.setServiceUuid(tnNssi.getModelVersionId())
+		serviceInfo.setGlobalSubscriberId(globalSubscriberId)
+		serviceInfo.setSubscriptionServiceType(subscriptionServiceType)
+
+		JsonObject json = new JsonObject()
+		json.addProperty("deAllocateNssi", objectMapper.writeValueAsString(deallocateNssi))
+		json.addProperty("esrInfo", objectMapper.writeValueAsString(esrInfo))
+		json.addProperty("serviceInfo", objectMapper.writeValueAsString(serviceInfo))
+		return json.toString()
+		
+	}
+	
+	private void deleteServiceInstanceInAAI(DelegateExecution execution,String instanceId) {
+		try {
+			AAIResourceUri serviceInstanceUri = AAIUriFactory.createResourceUri(AAIObjectType.SERVICE_INSTANCE, execution.getVariable("globalSubscriberId"), execution.getVariable("serviceType"), instanceId)
+			getAAIClient().delete(serviceInstanceUri)
+			logger.debug("${Prefix} Exited deleteServiceInstance")
+		}catch(Exception e){
+			logger.debug("Error occured within deleteServiceInstance method: " + e)
+		}
+	}
+
+}