Github user JPercivall commented on a diff in the pull request:
https://github.com/apache/nifi/pull/525#discussion_r67435751
--- 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 --
EvaluateXPath has an XPath validator, could it be reused here? (assuming it
was refactored to somewhere common)
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