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From brosander <...@git.apache.org>
Subject [GitHub] nifi pull request #525: NIFI-1976 - Windows Event Log native processor
Date Fri, 17 Jun 2016 13:38:59 GMT
Github user brosander commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/525#discussion_r67511182
  
    --- Diff: nifi-nar-bundles/nifi-windows-event-log-bundle/nifi-windows-event-log-processors/src/main/java/org/apache/nifi/processors/windows/event/log/EvtSubscribe.java
---
    @@ -0,0 +1,272 @@
    +/*
    + * 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.processors.windows.event.log;
    +
    +import com.google.common.annotations.VisibleForTesting;
    +import com.google.common.net.MediaType;
    +import com.sun.jna.platform.win32.Kernel32;
    +import com.sun.jna.platform.win32.WinNT;
    +import org.apache.commons.io.Charsets;
    +import org.apache.nifi.annotation.behavior.InputRequirement;
    +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.Tags;
    +import org.apache.nifi.annotation.lifecycle.OnScheduled;
    +import org.apache.nifi.annotation.lifecycle.OnStopped;
    +import org.apache.nifi.components.PropertyDescriptor;
    +import org.apache.nifi.components.ValidationContext;
    +import org.apache.nifi.components.ValidationResult;
    +import org.apache.nifi.flowfile.FlowFile;
    +import org.apache.nifi.flowfile.attributes.CoreAttributes;
    +import org.apache.nifi.processor.AbstractSessionFactoryProcessor;
    +import org.apache.nifi.processor.ProcessContext;
    +import org.apache.nifi.processor.ProcessSession;
    +import org.apache.nifi.processor.ProcessSessionFactory;
    +import org.apache.nifi.processor.Relationship;
    +import org.apache.nifi.processor.exception.ProcessException;
    +import org.apache.nifi.processor.util.StandardValidators;
    +import org.apache.nifi.processors.windows.event.log.jna.EventSubscribeXmlRenderingCallback;
    +import org.apache.nifi.processors.windows.event.log.jna.WEvtApi;
    +
    +import java.util.ArrayList;
    +import java.util.Arrays;
    +import java.util.Collection;
    +import java.util.Collections;
    +import java.util.HashSet;
    +import java.util.LinkedList;
    +import java.util.List;
    +import java.util.Queue;
    +import java.util.Set;
    +import java.util.concurrent.atomic.AtomicReference;
    +
    +
    +@InputRequirement(InputRequirement.Requirement.INPUT_FORBIDDEN)
    +@Tags({"ingest", "event", "windows"})
    +@CapabilityDescription("Registers a Windows Event Log Subscribe Callback to receive FlowFiles
from Events on Windows.  These can be filtered via channel and XPath.")
    +@WritesAttributes({
    +        @WritesAttribute(attribute = "mime.type", description = "Will set a MIME type
value of application/xml.")
    +})
    +public class EvtSubscribe extends AbstractSessionFactoryProcessor {
    +    public static final String DEFAULT_CHANNEL = "System";
    +    public static final String DEFAULT_XPATH = "*";
    +    public static final int DEFAULT_MAX_BUFFER = 1024 * 1024;
    +    public static final int DEFAULT_MAX_QUEUE_SIZE = 1024;
    +
    +    public static final PropertyDescriptor CHANNEL = new PropertyDescriptor.Builder()
    +            .name("channel")
    +            .displayName("Channel")
    +            .required(true)
    +            .defaultValue(DEFAULT_CHANNEL)
    +            .description("The Windows Event Log Channel to listen to.")
    +            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
    +            .build();
    +
    +    public static final PropertyDescriptor QUERY = new PropertyDescriptor.Builder()
    +            .name("query")
    +            .displayName("XPath Query")
    +            .required(true)
    +            .defaultValue(DEFAULT_XPATH)
    +            .description("XPath Query to filter events. (See https://msdn.microsoft.com/en-us/library/windows/desktop/dd996910(v=vs.85).aspx
for examples.)")
    +            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
    --- End diff --
    
    @JPercivall I may not be reading it correctly but both EvaluateXPath and EvaluateXQuery
appear to attempt to compile any dynamic properties they find in onTrigger().  I'm not seeing
any other validation.


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