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https://issues.apache.org/jira/browse/NIFI-589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14575347#comment-14575347
]
ASF GitHub Bot commented on NIFI-589:
-------------------------------------
Github user rdblue commented on a diff in the pull request:
https://github.com/apache/incubator-nifi/pull/51#discussion_r31856990
--- Diff:
nifi/nifi-nar-bundles/nifi-flume-bundle/nifi-flume-processors/src/main/java/org/apache/nifi/processors/flume/FlumeSourceProcessor.java
---
@@ -0,0 +1,191 @@
+/*
+ * 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.flume;
+
+import com.google.common.base.Throwables;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableSet;
+import java.util.List;
+import java.util.Set;
+import org.apache.flume.Context;
+import org.apache.flume.Event;
+import org.apache.flume.EventDeliveryException;
+import org.apache.flume.EventDrivenSource;
+import org.apache.flume.PollableSource;
+import org.apache.flume.Source;
+import org.apache.flume.SourceRunner;
+import org.apache.flume.Transaction;
+import org.apache.flume.channel.ChannelProcessor;
+import org.apache.flume.channel.MemoryChannel;
+import org.apache.flume.conf.Configurables;
+import org.apache.flume.source.EventDrivenSourceRunner;
+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.OnUnscheduled;
+
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.Validator;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.ProcessSession;
+import org.apache.nifi.processor.ProcessorInitializationContext;
+import org.apache.nifi.processor.Relationship;
+import org.apache.nifi.processor.SchedulingContext;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.processor.util.StandardValidators;
+
+/**
+ * This processor runs a Flume source
+ */
+@Tags({"flume", "hadoop", "get", "source"})
+@CapabilityDescription("Generate FlowFile data from a Flume source")
+public class FlumeSourceProcessor extends AbstractFlumeProcessor {
+
+ private Source source;
+ private SourceRunner runner;
+ private MemoryChannel channel;
+
+ public static final PropertyDescriptor SOURCE_TYPE = new
PropertyDescriptor.Builder()
+ .name("Source Type")
+ .description("The fully-qualified name of the Source class")
+ .required(true)
+ .addValidator(createSourceValidator())
+ .build();
+ public static final PropertyDescriptor AGENT_NAME = new
PropertyDescriptor.Builder()
+ .name("Agent Name")
+ .description("The name of the agent used in the Flume source
configuration")
+ .required(true)
+ .defaultValue("tier1")
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .build();
+ public static final PropertyDescriptor SOURCE_NAME = new
PropertyDescriptor.Builder()
+ .name("Source Name")
+ .description("The name of the source used in the Flume source
configuration")
+ .required(true)
+ .defaultValue("src-1")
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .build();
+ public static final PropertyDescriptor FLUME_CONFIG = new
PropertyDescriptor.Builder()
+ .name("Flume Configuration")
+ .description("The Flume configuration for the source copied
from the flume.properties file")
+ .required(true)
+ .defaultValue("")
+ .addValidator(Validator.VALID)
+ .build();
+
+ public static final Relationship SUCCESS = new
Relationship.Builder().name("success").build();
+
+ private List<PropertyDescriptor> descriptors;
+ private Set<Relationship> relationships;
+
+ @Override
+ protected void init(final ProcessorInitializationContext context) {
+ this.descriptors = ImmutableList.of(SOURCE_TYPE, AGENT_NAME,
SOURCE_NAME, FLUME_CONFIG);
+ this.relationships = ImmutableSet.of(SUCCESS);
+ }
+
+ @Override
+ protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
+ return descriptors;
+ }
+
+ @Override
+ public Set<Relationship> getRelationships() {
+ return relationships;
+ }
+
+ @OnScheduled
+ public void onScheduled(final SchedulingContext context) {
+ try {
+ source = SOURCE_FACTORY.create(
+ context.getProperty(SOURCE_NAME).getValue(),
+ context.getProperty(SOURCE_TYPE).getValue());
+
+ String flumeConfig =
context.getProperty(FLUME_CONFIG).getValue();
+ String agentName = context.getProperty(AGENT_NAME).getValue();
+ String sourceName =
context.getProperty(SOURCE_NAME).getValue();
+ Configurables.configure(source,
+ getFlumeSourceContext(flumeConfig, agentName,
sourceName));
+
+ if (source instanceof EventDrivenSource) {
+ runner = new EventDrivenSourceRunner();
+ channel = new MemoryChannel();
+ Configurables.configure(channel, new Context());
+ channel.start();
+ source.setChannelProcessor(new ChannelProcessor(new
NifiChannelSelector(channel)));
+ runner.setSource(source);
+ runner.start();
+ }
+ } catch (Throwable th) {
+ getLogger().error("Error creating source", th);
+ throw Throwables.propagate(th);
+ }
+ }
+
+ @OnUnscheduled
+ public void unScheduled() {
+ if (runner != null) {
+ runner.stop();
+ }
+ if (channel != null) {
+ channel.stop();
+ }
+ }
+
+ @Override
+ public void onTrigger(final ProcessContext context,
+ final ProcessSession session) throws ProcessException {
+ if (source instanceof EventDrivenSource) {
+ onEventDrivenTrigger(context, session);
+ } else if (source instanceof PollableSource) {
+ onPollableTrigger((PollableSource) source, context, session);
+ }
+ }
+
+ public void onPollableTrigger(final PollableSource pollableSource,
+ final ProcessContext context, final ProcessSession session)
+ throws ProcessException {
+ try {
+ pollableSource.setChannelProcessor(new ChannelProcessor(
+ new NifiChannelSelector(new NifiChannel(session,
SUCCESS))));
--- End diff --
I think the channel, selector, and processor can be reused by setting the
session on the channel each time. The current session would be used to create
transactions, which we don't expect to be long lived because this is a source.
Then you might not have to start and stop the source each time, right?
> Add processors that can run Apache Flume sources/sinks
> ------------------------------------------------------
>
> Key: NIFI-589
> URL: https://issues.apache.org/jira/browse/NIFI-589
> Project: Apache NiFi
> Issue Type: New Feature
> Components: Extensions
> Affects Versions: 0.1.0
> Reporter: Joey Echeverria
>
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