1 files changed, 91 insertions, 0 deletions
diff --git a/services/external-schema-manager/src/main/java/org/onap/dcaegen2/services/sdk/services/external/schema/manager/service/ValidatorCache.java b/services/external-schema-manager/src/main/java/org/onap/dcaegen2/services/sdk/services/external/schema/manager/service/ValidatorCache.java
new file mode 100644
index 00000000..e67f0ebc
--- /dev/null
+++ b/services/external-schema-manager/src/main/java/org/onap/dcaegen2/services/sdk/services/external/schema/manager/service/ValidatorCache.java
@@ -0,0 +1,91 @@
+/*
+ * ============LICENSE_START=======================================================
+ * DCAEGEN2-SERVICES-SDK
+ * ================================================================================
+ * Copyright (C) 2020 Nokia. 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.dcaegen2.services.sdk.services.external.schema.manager.service;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import org.onap.dcaegen2.services.sdk.services.external.schema.manager.model.SchemaReference;
+import org.onap.dcaegen2.services.sdk.services.external.schema.manager.exception.IncorrectInternalFileReferenceException;
+import org.openapi4j.core.exception.ResolutionException;
+import org.openapi4j.schema.validator.v3.SchemaValidator;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+class ValidatorCache {
+
+    private static final Logger logger = LoggerFactory.getLogger(ValidatorCache.class);
+    private final SchemaReferenceMapper schemaReferenceMapper;
+    private final Map<String, SchemaValidator> cache;
+
+    ValidatorCache(SchemaReferenceMapper schemaReferenceMapper) {
+        this.schemaReferenceMapper = schemaReferenceMapper;
+        this.cache = new HashMap<>();
+    }
+
+    SchemaReferenceMapper getSchemaReferenceMapper() {
+        return schemaReferenceMapper;
+    }
+
+    synchronized SchemaValidator resolveValidator(JsonNode event, String schemaRefPath) throws IOException {
+        SchemaReference schemaReference = resolveSchemaReference(event, schemaRefPath);
+        schemaReference = schemaReferenceMapper.mapToLocalSchema(schemaReference);
+        SchemaValidator validator = cache.get(schemaReference.getUrl());
+        if (!isValidatorCached(validator)) {
+            validator = createNewValidator(schemaReference);
+        }
+        return validator;
+    }
+
+    private SchemaReference resolveSchemaReference(JsonNode event, String schemaRefPath) {
+        String publicSchemaReference = JsonFragmentRetriever.getFragment(event, schemaRefPath).asText();
+        SchemaReferenceResolver schemaReferenceResolver = new SchemaReferenceResolver(publicSchemaReference);
+        return new SchemaReference(schemaReferenceResolver);
+    }
+
+    private boolean isValidatorCached(SchemaValidator validator) {
+        return validator != null;
+    }
+
+    private SchemaValidator createNewValidator(SchemaReference schemaReference) throws IOException {
+        logger.info("Creating new stndDefined schema validator");
+        JsonNode schemaRefNode = SchemaReferenceJsonGenerator.getSchemaReferenceJson(schemaReference);
+        SchemaValidator schemaValidator = handleValidatorCreation(schemaRefNode);
+        cacheSchemaValidator(schemaReference.getFullSchemaReference(), schemaValidator);
+        return schemaValidator;
+    }
+
+    private SchemaValidator handleValidatorCreation(JsonNode schemaNode) {
+        try {
+            return new SchemaValidator("StndDefinedSchemaValidator", schemaNode);
+        } catch (ResolutionException e) {
+            throw new IncorrectInternalFileReferenceException("Schema reference refer to existing file, " +
+                    "but internal reference (after #) is incorrect. " + e.getMessage());
+        }
+    }
+
+    private void cacheSchemaValidator(String localSchemaReference, SchemaValidator schemaValidator) {
+        logger.info("Adding new stndDefined schema validator to cache");
+        cache.put(localSchemaReference, schemaValidator);
+    }
+}