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From GitBox <...@apache.org>
Subject [GitHub] [nifi] markap14 commented on a change in pull request #4337: NIFI-7536: Fix to improve performance of updating parameters
Date Thu, 18 Jun 2020 17:34:16 GMT

markap14 commented on a change in pull request #4337:
URL: https://github.com/apache/nifi/pull/4337#discussion_r442335960



##########
File path: nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-cluster/src/main/java/org/apache/nifi/cluster/coordination/http/endpoints/ProcessorRunStatusDetailsEndpointMerger.java
##########
@@ -0,0 +1,100 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+package org.apache.nifi.cluster.coordination.http.endpoints;
+
+import org.apache.nifi.cluster.coordination.http.EndpointResponseMerger;
+import org.apache.nifi.cluster.manager.NodeResponse;
+import org.apache.nifi.cluster.manager.PermissionsDtoMerger;
+import org.apache.nifi.controller.status.RunStatus;
+import org.apache.nifi.web.api.dto.ProcessorRunStatusDetailsDTO;
+import org.apache.nifi.web.api.entity.ProcessorsRunStatusDetailsEntity;
+import org.apache.nifi.web.api.entity.ProcessorRunStatusDetailsEntity;
+
+import java.net.URI;
+import java.util.ArrayList;
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+public class ProcessorRunStatusDetailsEndpointMerger implements EndpointResponseMerger {
+    public static final String SCHEDULE_SUMMARY_URI = "/nifi-api/processors/run-status-details/queries";
+
+    @Override
+    public boolean canHandle(final URI uri, final String method) {
+        return "POST".equalsIgnoreCase(method) && SCHEDULE_SUMMARY_URI.equals(uri.getPath());
+    }
+
+    @Override
+    public NodeResponse merge(final URI uri, final String method, final Set<NodeResponse>
successfulResponses, final Set<NodeResponse> problematicResponses, final NodeResponse
clientResponse) {
+        if (!canHandle(uri, method)) {
+            throw new IllegalArgumentException("Cannot use Endpoint Mapper of type " + getClass().getSimpleName()
+ " to map responses for URI " + uri + ", HTTP Method " + method);
+        }
+
+        final ProcessorsRunStatusDetailsEntity responseEntity = clientResponse.getClientResponse().readEntity(ProcessorsRunStatusDetailsEntity.class);
+
+        // Create mapping of Processor ID to its schedule Summary.
+        final Map<String, ProcessorRunStatusDetailsEntity> scheduleSummaries = responseEntity.getRunStatusDetails().stream()
+            .collect(Collectors.toMap(entity -> entity.getRunStatusDetails().getId(),
entity -> entity));
+
+        for (final NodeResponse nodeResponse : successfulResponses) {
+            final ProcessorsRunStatusDetailsEntity nodeResponseEntity = nodeResponse == clientResponse
? responseEntity :
+                nodeResponse.getClientResponse().readEntity(ProcessorsRunStatusDetailsEntity.class);
+
+            for (final ProcessorRunStatusDetailsEntity processorEntity : nodeResponseEntity.getRunStatusDetails())
{
+                final String processorId = processorEntity.getRunStatusDetails().getId();
+
+                final ProcessorRunStatusDetailsEntity mergedEntity = scheduleSummaries.computeIfAbsent(processorId,
id -> new ProcessorRunStatusDetailsEntity());
+                merge(mergedEntity, processorEntity);
+            }
+        }
+
+        final ProcessorsRunStatusDetailsEntity mergedEntity = new ProcessorsRunStatusDetailsEntity();
+        mergedEntity.setRunStatusDetails(new ArrayList<>(scheduleSummaries.values()));
+        return new NodeResponse(clientResponse, mergedEntity);
+    }
+
+    private void merge(final ProcessorRunStatusDetailsEntity target, final ProcessorRunStatusDetailsEntity
additional) {
+        PermissionsDtoMerger.mergePermissions(target.getPermissions(), additional.getPermissions());
+
+        final ProcessorRunStatusDetailsDTO targetSummaryDto = target.getRunStatusDetails();
+        final ProcessorRunStatusDetailsDTO additionalSummaryDto = additional.getRunStatusDetails();
+
+        // If name is null, it's because of permissions, so we want to nullify it in the
target.
+        if (additionalSummaryDto.getName() == null) {

Review comment:
       It would be more descriptive in terms of the reasoning behind why it would be null.
However, the convention is more to merge field-by-field. If for some reason the name were
ever to become null for another reason, this would probably be safer.




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