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authorRob Daugherty <rd472p@att.com>2018-05-15 13:23:01 -0400
committerRob Daugherty <rd472p@att.com>2018-05-15 13:58:10 -0400
commitd2e69c0d689596033a9c35aa98d37a44e2cc88cb (patch)
treebe29159a319f63c9e5c242da6354c1ef0133363a /common/src/main/java
parentb4d4cb8703842aee6df6c9a5d2a0fd6617539233 (diff)
WorkflowResponse json issues
This commit adds some robustness to the interface between the API-H and BPMN, specifically, in how the response is handled. I don't have proof, but there appears to be some randomness to the json provider behavior when used with the jax-rs. Sometimes, the serializer is adding the root element, and sometimes it is not. Maybe there's something wrong with the configuration. Maybe we have competing json providers. I couldn't pin this down. I'm almost certain it is the presence of the root element in the content that causes the API-H code to fail parsing of the BPMN response. This doesn't kill the request, as you might expect, but rather, the API-H passes the BPMN response through to the client (VID, or policy, or whatever). The original problem (SO-586) was "fixed" by "removing the wrapper". This "wrapper" is a needed feature of the interface between BPMN and the API-H. We shouldn't have removed it. The fact that the "fix" appeared to work is due to the behavior I described in the previous paragraph. The API-H chokes on the message, and it passes it through unchanged. Not really what we want. So, I don't know why the jackson/json behavior is flaky and different now, but I can (and did) modify the API-H so it can parse a json message whether or not it has a root element. Note that WorkflowResponse.java (in BPMN) and CamundaResponse.java (in the API-H) are basically the same bean representing the message format. Seems less than ideal to have two different classes. Also note that I changed the name of the "response" attribute of the WorkflowResponse and CamundaResponse classes to "content". Got tired of seeing this nonsense everywhere in the code: response.getResponse() Change-Id: Icaf70f8457de99e493cf882170fe778c620308c9 Issue-ID: SO-586 Issue-ID: SO-618 Signed-off-by: Rob Daugherty <rd472p@att.com>
Diffstat (limited to 'common/src/main/java')
-rw-r--r--common/src/main/java/org/openecomp/mso/utils/RootIgnoringJsonDeserializer.java67
-rw-r--r--common/src/main/java/org/openecomp/mso/utils/RootIgnoringObjectMapper.java39
2 files changed, 106 insertions, 0 deletions
diff --git a/common/src/main/java/org/openecomp/mso/utils/RootIgnoringJsonDeserializer.java b/common/src/main/java/org/openecomp/mso/utils/RootIgnoringJsonDeserializer.java
new file mode 100644
index 0000000000..95f72c4dd4
--- /dev/null
+++ b/common/src/main/java/org/openecomp/mso/utils/RootIgnoringJsonDeserializer.java
@@ -0,0 +1,67 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - SO
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. 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.openecomp.mso.utils;
+
+import java.io.IOException;
+import java.util.Map;
+
+import com.fasterxml.jackson.annotation.JsonRootName;
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonDeserializer;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+/**
+ * A JSON deserializer that ignores the root element if it is present.
+ */
+public class RootIgnoringJsonDeserializer<T> extends JsonDeserializer<T> {
+
+ private final ObjectMapper mapper = new ObjectMapper();
+ private final Class<T> clazz;
+ private final String jsonRootName;
+
+ public RootIgnoringJsonDeserializer(Class<T> clazz) {
+ this.clazz = clazz;
+
+ JsonRootName annotation = clazz.getAnnotation(JsonRootName.class);
+
+ if (annotation == null || annotation.value() == null || annotation.value().equals("")) {
+ jsonRootName = clazz.getSimpleName();
+ } else {
+ jsonRootName = annotation.value();
+ }
+ }
+
+ @Override
+ public T deserialize(JsonParser jp, DeserializationContext dc)
+ throws IOException, JsonProcessingException {
+ JsonNode rootNode = jp.getCodec().readTree(jp);
+ Map.Entry<String,JsonNode> field = rootNode.fields().next();
+
+ if (jsonRootName.equals(field.getKey())) {
+ rootNode = field.getValue();
+ }
+
+ return mapper.convertValue(rootNode, clazz);
+ }
+} \ No newline at end of file
diff --git a/common/src/main/java/org/openecomp/mso/utils/RootIgnoringObjectMapper.java b/common/src/main/java/org/openecomp/mso/utils/RootIgnoringObjectMapper.java
new file mode 100644
index 0000000000..6f3c5b7d99
--- /dev/null
+++ b/common/src/main/java/org/openecomp/mso/utils/RootIgnoringObjectMapper.java
@@ -0,0 +1,39 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - SO
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. 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.openecomp.mso.utils;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.module.SimpleModule;
+
+/**
+ * An ObjectMapper for a specific class that ignores the root element
+ * if it is present.
+ */
+public class RootIgnoringObjectMapper<T> extends ObjectMapper {
+
+ private static final long serialVersionUID = 6812584067195377395L;
+
+ public RootIgnoringObjectMapper(Class<T> clazz) {
+ SimpleModule module = new SimpleModule();
+ module.addDeserializer(clazz, new RootIgnoringJsonDeserializer<T>(clazz));
+ registerModule(module);
+ }
+} \ No newline at end of file