341: Fix Validation Rule Engine concurrency issues

etor/src/main/java/gov/hhs/cdc/trustedintermediary/etor/ruleengine/RuleEngine.java

@@ -30,7 +30,11 @@ public void unloadRules() {
 
     public void ensureRulesLoaded() {
         if (rules.isEmpty()) {
-            loadRules();
+            synchronized (this) {
+                if (rules.isEmpty()) {
+                    loadRules();
+                }
+            }
         }
     }
 

etor/src/main/resources/rule_definitions.json

@@ -5,7 +5,7 @@
       "violationMessage": "Message doesn't have required receiver id",
       "conditions": [ ],
       "validations": [
-        "Bundle.entry.resource.ofType(MessageHeader).destination.receiver.resolve().identifier.value.exists()"
+        "Bundle.entry.resource.ofType(MessageHeader).destination.receiver.resolve().identifier.where(system = 'urn:ietf:rfc:3986').value.exists()"
       ]
     },
     {

etor/src/test/groovy/gov/hhs/cdc/trustedintermediary/etor/ruleengine/RuleEngineIntegrationTest.groovy

@@ -8,6 +8,10 @@ import gov.hhs.cdc.trustedintermediary.wrappers.HapiFhir
 import gov.hhs.cdc.trustedintermediary.wrappers.Logger
 import gov.hhs.cdc.trustedintermediary.wrappers.formatter.Formatter
 import org.hl7.fhir.r4.model.Bundle
+import org.hl7.fhir.r4.model.Coding
+import org.hl7.fhir.r4.model.MessageHeader
+import org.hl7.fhir.r4.model.Organization
+import org.hl7.fhir.r4.model.Reference
 import spock.lang.Specification
 
 import java.nio.file.Files
@@ -80,7 +84,7 @@ class RuleEngineIntegrationTest extends Specification {
         where:
         testFile | validation
         "Orders/001_OML_O21_short.fhir"                                    | "Bundle.entry.resource.ofType(MessageHeader).focus.resolve().category.exists()"
-        "Orders/003_AL_ORM_O01_NBS_Fully_Populated_1_hl7_translation.fhir" | "Bundle.entry.resource.ofType(MessageHeader).destination.receiver.resolve().identifier.value.exists()"
+        "Orders/003_AL_ORM_O01_NBS_Fully_Populated_1_hl7_translation.fhir" | "Bundle.entry.resource.ofType(MessageHeader).destination.receiver.resolve().identifier.where(system = 'urn:ietf:rfc:3986').value.exists()"
         // Once we fix the mapping for ORM from story #900 and update the FHIR files in /examples/Test/Orders, we can uncomment the below line
         // "Orders/003_AL_ORM_O01_NBS_Fully_Populated_1_hl7_translation.fhir" | "Bundle.entry.resource.ofType(Observation).where(code.coding.code = '57723-9').value.coding.code.exists()"
     }
@@ -95,10 +99,78 @@ class RuleEngineIntegrationTest extends Specification {
 
         where:
         testFile | validation
-        "Orders/001_OML_O21_short.fhir" | "Bundle.entry.resource.ofType(MessageHeader).destination.receiver.resolve().identifier.value.exists()"
+        "Orders/001_OML_O21_short.fhir" | "Bundle.entry.resource.ofType(MessageHeader).destination.receiver.resolve().identifier.where(system = 'urn:ietf:rfc:3986').value.exists()"
         "Orders/001_OML_O21_short.fhir" | "Bundle.entry.resource.ofType(Observation).where(code.coding.code = '57723-9').value.coding.code.exists()"
     }
 
+    def "validation passes: Message has required receiver id"() {
+        given:
+        def fhirPathValidation = "Bundle.entry.resource.ofType(MessageHeader).destination.receiver.resolve().identifier.where(system = 'urn:ietf:rfc:3986').value.exists()"
+        def rule = createValidationRule([], [fhirPathValidation])
+
+        when:
+        Organization receiverOrganization = new Organization()
+        receiverOrganization.setId(UUID.randomUUID().toString())
+        receiverOrganization
+                .addIdentifier()
+                .setSystem("urn:ietf:rfc:3986")
+                .setValue("simulated-hospital-id")
+        def bundle = createMessageBundle(receiverOrganization: receiverOrganization)
+        // for some reason, we need to encode and decode the bundle for resolve() to work
+        def fhirResource = new HapiFhirResource(fhir.parseResource(fhir.encodeResourceToJson(bundle), Bundle))
+
+        then:
+        rule.isValid(fhirResource)
+
+        when:
+        receiverOrganization = new Organization()
+        receiverOrganization.setId(UUID.randomUUID().toString())
+        receiverOrganization
+                .addIdentifier()
+                .setSystem("another-system")
+                .setValue("simulated-hospital-id")
+        bundle = createMessageBundle(receiverOrganization: receiverOrganization)
+        fhirResource = new HapiFhirResource(fhir.parseResource(fhir.encodeResourceToJson(bundle), Bundle))
+
+        then:
+        !rule.isValid(fhirResource)
+
+        when:
+        receiverOrganization = new Organization()
+        receiverOrganization.setId(UUID.randomUUID().toString())
+        receiverOrganization
+                .addIdentifier()
+                .setValue("simulated-hospital-id")
+        bundle = createMessageBundle(receiverOrganization: receiverOrganization)
+        fhirResource = new HapiFhirResource(fhir.parseResource(fhir.encodeResourceToJson(bundle), Bundle))
+
+        then:
+        !rule.isValid(fhirResource)
+    }
+
+    Bundle createMessageBundle(Map params) {
+        String messageTypeCode = params.messageTypeCode as String ?: "ORM_O01"
+        Organization receiverOrganization = params.receiverOrganization as Organization ?: new Organization()
+        MessageHeader messageHeader = params.messageType as MessageHeader ?: new MessageHeader()
+
+        MessageHeader.MessageDestinationComponent destination = messageHeader.addDestination()
+        String receiverOrganizationFullUrl = "Organization/" + receiverOrganization.getId()
+        destination.setReceiver(new Reference(receiverOrganizationFullUrl))
+
+        Coding eventCoding = new Coding()
+        eventCoding.setSystem("http://terminology.hl7.org/CodeSystem/v2-0003")
+        String[] parts = messageTypeCode.split("_")
+        eventCoding.setCode(parts[1])
+        eventCoding.setDisplay(String.format("%s^%s^%s", parts[0], parts[1], messageTypeCode))
+        messageHeader.setEvent(eventCoding)
+
+        Bundle bundle = new Bundle()
+        bundle.setType(Bundle.BundleType.MESSAGE)
+        bundle.addEntry().setResource(messageHeader)
+        bundle.addEntry().setFullUrl(receiverOrganizationFullUrl).setResource(receiverOrganization)
+        return bundle
+    }
+
     Rule createValidationRule(List<String> ruleConditions, List<String> ruleValidations) {
         return new ValidationRule(
                 name: "Rule name",

etor/src/test/groovy/gov/hhs/cdc/trustedintermediary/etor/ruleengine/RuleEngineTest.groovy

@@ -39,6 +39,27 @@ class RuleEngineTest extends Specification {
         1 * mockRuleLoader.loadRules(_ as String) >> [Mock(Rule)]
     }
 
+    def "ensureRulesLoaded loads rules only once on multiple threads"() {
+        given:
+        def threadsNum = 10
+        def iterations = 4
+
+        when:
+        List<Thread> threads = []
+        (1..threadsNum).each { threadId ->
+            threads.add(new Thread({
+                for (int i = 0; i < iterations; i++) {
+                    ruleEngine.ensureRulesLoaded()
+                }
+            }))
+        }
+        threads*.start()
+        threads*.join()
+
+        then:
+        1 * mockRuleLoader.loadRules(_ as String) >> [Mock(Rule)]
+    }
+
     def "ensureRulesLoaded logs an error if there is an exception loading the rules"() {
         given:
         def exception = new RuleLoaderException("Error loading rules", new Exception())