/*
* 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 org.apache.flume.EventDeliveryException;
import org.apache.flume.Sink;
import org.apache.flume.conf.Configurables;
import org.apache.nifi.annotation.behavior.InputRequirement;
import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
import org.apache.nifi.annotation.behavior.Restricted;
import org.apache.nifi.annotation.behavior.TriggerSerially;
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.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.exception.ProcessException;
import org.apache.nifi.processor.util.StandardValidators;
import java.util.List;
import java.util.Set;
/**
* This processor runs a Flume sink
*/
@TriggerSerially
@Tags({"flume", "hadoop", "put", "sink", "restricted"})
@InputRequirement(Requirement.INPUT_REQUIRED)
@CapabilityDescription("Execute a Flume sink. Each input FlowFile is converted into a Flume Event for processing by the sink.")
@Restricted("Provides operator the ability to execute arbitrary Flume configurations assuming all permissions that NiFi has.")
public class ExecuteFlumeSink extends AbstractFlumeProcessor {
public static final PropertyDescriptor SINK_TYPE = new PropertyDescriptor.Builder()
.name("Sink Type")
.description("The component type name for the sink. For some sinks, this is a short, symbolic name (e.g. hdfs)."
+ " For others, it's the fully-qualified name of the Sink class. See the Flume User Guide for details.")
.required(true)
.addValidator(createSinkValidator())
.build();
public static final PropertyDescriptor AGENT_NAME = new PropertyDescriptor.Builder()
.name("Agent Name")
.description("The name of the agent used in the Flume sink configuration")
.required(true)
.defaultValue("tier1")
.addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
.build();
public static final PropertyDescriptor SOURCE_NAME = new PropertyDescriptor.Builder()
.name("Sink Name")
.description("The name of the sink used in the Flume sink configuration")
.required(true)
.defaultValue("sink-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 sink copied from the flume.properties file")
.required(true)
.defaultValue("")
.addValidator(Validator.VALID)
.build();
public static final Relationship SUCCESS = new Relationship.Builder().name("success").build();
public static final Relationship FAILURE = new Relationship.Builder().name("failure").build();
private List<PropertyDescriptor> descriptors;
private Set<Relationship> relationships;
private volatile Sink sink;
private volatile NifiSinkSessionChannel channel;
@Override
protected void init(final ProcessorInitializationContext context) {
this.descriptors = ImmutableList.of(SINK_TYPE, AGENT_NAME, SOURCE_NAME, FLUME_CONFIG);
this.relationships = ImmutableSet.of(SUCCESS, FAILURE);
}
@Override
protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
return descriptors;
}
@Override
public Set<Relationship> getRelationships() {
return relationships;
}
@OnScheduled
public void onScheduled(final ProcessContext context) {
try {
channel = new NifiSinkSessionChannel(SUCCESS, FAILURE);
channel.start();
sink = SINK_FACTORY.create(context.getProperty(SOURCE_NAME).getValue(),
context.getProperty(SINK_TYPE).getValue());
sink.setChannel(channel);
String flumeConfig = context.getProperty(FLUME_CONFIG).getValue();
String agentName = context.getProperty(AGENT_NAME).getValue();
String sinkName = context.getProperty(SOURCE_NAME).getValue();
Configurables.configure(sink,
getFlumeSinkContext(flumeConfig, agentName, sinkName));
sink.start();
} catch (Throwable th) {
getLogger().error("Error creating sink", th);
throw Throwables.propagate(th);
}
}
@OnStopped
public void stopped() {
sink.stop();
channel.stop();
}
@Override
public void onTrigger(final ProcessContext context, final ProcessSession session) throws ProcessException {
channel.setSession(session);
try {
sink.process();
} catch (EventDeliveryException ex) {
throw new ProcessException("Flume event delivery failed", ex);
}
}
}