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From pvillard31 <>
Subject [GitHub] nifi pull request #721: Nifi 2398 - Apache Ignite Get Processor
Date Wed, 21 Sep 2016 21:50:38 GMT
Github user pvillard31 commented on a diff in the pull request:
    --- Diff: nifi-nar-bundles/nifi-ignite-bundle/nifi-ignite-processors/src/main/java/org/apache/nifi/processors/ignite/cache/
    @@ -0,0 +1,119 @@
    + * 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
    + *
    + *
    + *
    + * 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.processors.ignite.cache;
    +import java.util.ArrayList;
    +import java.util.List;
    +import org.apache.commons.lang3.StringUtils;
    +import org.apache.nifi.annotation.behavior.EventDriven;
    +import org.apache.nifi.annotation.behavior.InputRequirement;
    +import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
    +import org.apache.nifi.annotation.behavior.SupportsBatching;
    +import org.apache.nifi.annotation.behavior.WritesAttribute;
    +import org.apache.nifi.annotation.behavior.WritesAttributes;
    +import org.apache.nifi.annotation.documentation.CapabilityDescription;
    +import org.apache.nifi.annotation.documentation.SeeAlso;
    +import org.apache.nifi.annotation.documentation.Tags;
    +import org.apache.nifi.annotation.lifecycle.OnScheduled;
    +import org.apache.nifi.components.PropertyDescriptor;
    +import org.apache.nifi.flowfile.FlowFile;
    +import org.apache.nifi.processor.ProcessContext;
    +import org.apache.nifi.processor.ProcessSession;
    +import org.apache.nifi.processor.exception.ProcessException;
    + * Get cache processors which gets byte array for the key from Ignite cache and set the
    + * as the FlowFile content.
    + */
    +@Tags({ "Ignite", "get", "read", "cache", "key" })
    +@CapabilityDescription("Get the byte array from Ignite Cache and adds it as the content
of a FlowFile." +
    +    "The processor uses the value of FlowFile attribute (Ignite cache entry key) as the
cache key lookup. " +
    +    "If the entry corresponding to the key is not found in the cache an error message
is associated with the FlowFile " +
    +    "Note - The Ignite Kernel periodically outputs node performance statistics to the
logs. This message " +
    +    " can be turned off by setting the log level for logger 'org.apache.ignite' to WARN
in the logback.xml configuration file.")
    +    @WritesAttribute(attribute = GetIgniteCache.IGNITE_GET_FAILED_REASON_ATTRIBUTE_KEY,
description = "The reason for getting entry from cache"),
    +    @WritesAttribute(attribute = GetIgniteCache.IGNITE_GET_FAILED_MISSING_KEY_MESSAGE,
description = "The FlowFile key attribute was missing.")
    +    })
    +public class GetIgniteCache extends AbstractIgniteCacheProcessor {
    +    /** Flow file attribute keys and messages */
    +    public static final String IGNITE_GET_FAILED_REASON_ATTRIBUTE_KEY = "ignite.cache.get.failed.reason";
    +    public static final String IGNITE_GET_FAILED_MISSING_KEY_MESSAGE = "The FlowFile
key attribute was missing";
    +    public static final String IGNITE_GET_FAILED_MISSING_ENTRY_MESSAGE = "The cache byte
array entry was null or zero length";
    +    public static final String IGNITE_GET_FAILED_MESSAGE_PREFIX = "The cache request
failed because of ";
    +    static {
    +        descriptors = new ArrayList<>();
    --- End diff --
    You are sharing a static reference for descriptors in both processors, it results in a
race condition and not all properties are present. Have a look to other processors extending
an abstract class to have an example.

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