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From olegz <...@git.apache.org>
Subject [GitHub] nifi pull request: NIFI-1727: Refactored logic for merging HTTP Re...
Date Mon, 18 Apr 2016 16:06:20 GMT
Github user olegz commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/338#discussion_r60086063
  
    --- Diff: nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-cluster/src/main/java/org/apache/nifi/cluster/coordination/http/StandardHttpResponseMerger.java
---
    @@ -0,0 +1,164 @@
    +/*
    + * 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;
    +
    +import java.io.IOException;
    +import java.net.URI;
    +import java.util.ArrayList;
    +import java.util.List;
    +import java.util.Set;
    +import java.util.stream.Collectors;
    +
    +import javax.ws.rs.core.StreamingOutput;
    +
    +import org.apache.nifi.cluster.coordination.http.endpoints.BulletinBoardEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.ComponentStateEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.ConnectionStatusEndpiontMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.ControllerServiceEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.ControllerServiceReferenceEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.ControllerServicesEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.ControllerStatusEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.CountersEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.DropRequestEndpiontMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.FlowSnippetEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.GroupStatusEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.ListFlowFilesEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.PortStatusEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.ProcessGroupEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.ProcessorEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.ProcessorStatusEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.ProcessorsEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.ProvenanceEventEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.ProvenanceQueryEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.RemoteProcessGroupEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.RemoteProcessGroupStatusEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.RemoteProcessGroupsEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.ReportingTaskEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.ReportingTasksEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.StatusHistoryEndpointMerger;
    +import org.apache.nifi.cluster.coordination.http.endpoints.SystemDiagnosticsEndpointMerger;
    +import org.apache.nifi.cluster.manager.NodeResponse;
    +import org.apache.nifi.stream.io.NullOutputStream;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +public class StandardHttpResponseMerger implements HttpResponseMerger {
    +    private Logger logger = LoggerFactory.getLogger(StandardHttpResponseMerger.class);
    +    private static final List<EndpointResponseMerger> endpointMergers = new ArrayList<>();
    +
    +    static {
    +        endpointMergers.add(new ControllerStatusEndpointMerger());
    +        endpointMergers.add(new GroupStatusEndpointMerger());
    +        endpointMergers.add(new ProcessorStatusEndpointMerger());
    +        endpointMergers.add(new ConnectionStatusEndpiontMerger());
    +        endpointMergers.add(new PortStatusEndpointMerger());
    +        endpointMergers.add(new RemoteProcessGroupStatusEndpointMerger());
    +        endpointMergers.add(new ProcessorEndpointMerger());
    +        endpointMergers.add(new ProcessorsEndpointMerger());
    +        endpointMergers.add(new RemoteProcessGroupEndpointMerger());
    +        endpointMergers.add(new RemoteProcessGroupsEndpointMerger());
    +        endpointMergers.add(new ProcessGroupEndpointMerger());
    +        endpointMergers.add(new FlowSnippetEndpointMerger());
    +        endpointMergers.add(new ProvenanceQueryEndpointMerger());
    +        endpointMergers.add(new ProvenanceEventEndpointMerger());
    +        endpointMergers.add(new ControllerServiceEndpointMerger());
    +        endpointMergers.add(new ControllerServicesEndpointMerger());
    +        endpointMergers.add(new ControllerServiceReferenceEndpointMerger());
    +        endpointMergers.add(new ReportingTaskEndpointMerger());
    +        endpointMergers.add(new ReportingTasksEndpointMerger());
    +        endpointMergers.add(new DropRequestEndpiontMerger());
    +        endpointMergers.add(new ListFlowFilesEndpointMerger());
    +        endpointMergers.add(new ComponentStateEndpointMerger());
    +        endpointMergers.add(new BulletinBoardEndpointMerger());
    +        endpointMergers.add(new StatusHistoryEndpointMerger());
    +        endpointMergers.add(new SystemDiagnosticsEndpointMerger());
    +        endpointMergers.add(new CountersEndpointMerger());
    +    }
    +
    +    @Override
    +    public NodeResponse mergeResponses(final URI uri, final String httpMethod, final
Set<NodeResponse> nodeResponses) {
    +        final boolean hasSuccess = hasSuccessfulResponse(nodeResponses);
    +        if (!hasSuccess) {
    +            // It doesn't really matter which response we choose, as all are problematic.
    +            final NodeResponse clientResponse = nodeResponses.iterator().next();
    +
    +            // Drain the response from all nodes except for the 'chosen one'. This ensures
that we don't
    +            // leave data lingering on the socket and ensures that we don't consume the
content of the response
    +            // that we intend to respond with
    +            drainResponses(nodeResponses, clientResponse);
    +            return clientResponse;
    +        }
    +
    +        // Determine which responses are successful
    +        final Set<NodeResponse> successResponses = nodeResponses.stream().filter(p
-> p.is2xx()).collect(Collectors.toSet());
    +        final Set<NodeResponse> problematicResponses = nodeResponses.stream().filter(p
-> !p.is2xx()).collect(Collectors.toSet());
    +
    +        // Choose any of the successful responses to be the 'chosen one'.
    +        final NodeResponse clientResponse = successResponses.iterator().next();
    +
    +        final EndpointResponseMerger merger = getEndpointResponseMerger(uri, httpMethod);
    +        if (merger == null) {
    +            return clientResponse;
    +        }
    +
    +        return merger.merge(uri, httpMethod, successResponses, problematicResponses,
clientResponse);
    +    }
    +
    +    @Override
    +    public Set<NodeResponse> getProblematicNodeResponses(final Set<NodeResponse>
allResponses) {
    +        // Check if there are any 2xx responses
    +        final boolean containsSuccessfulResponse = hasSuccessfulResponse(allResponses);
    +
    +        if (containsSuccessfulResponse) {
    +            // If there is a 2xx response, we consider a response to be problematic if
it is not 2xx
    +            return allResponses.stream().filter(p -> !p.is2xx()).collect(Collectors.toSet());
    +        } else {
    +            // If no node is successful, we consider a problematic response to be only
those that are 5xx
    +            return allResponses.stream().filter(p -> p.is5xx()).collect(Collectors.toSet());
    +        }
    --- End diff --
    
    One of the benefits of functional programming is the ability to create a reference to
a function and then reuse it. So the above could be further simplified by doing something
like this:
    ```
    Predicate<?> predicate = containsSuccessfulResponse ? p -> !p.is2xx() : p ->
p.is5xx()
    return allResponses.stream().filter(predicate).collect(Collectors.toSet());
    ```


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