/*
* 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 com.processors.rangareddy_doubt;
import org.apache.nifi.components.PropertyDescriptor;
import org.apache.nifi.components.PropertyValue;
import org.apache.nifi.flowfile.FlowFile;
import org.apache.nifi.flowfile.attributes.CoreAttributes;
import org.apache.nifi.processor.*;
import org.apache.commons.io.IOUtils;
import org.apache.nifi.annotation.behavior.ReadsAttribute;
import org.apache.nifi.annotation.behavior.ReadsAttributes;
import org.apache.nifi.annotation.behavior.WritesAttribute;
import org.apache.nifi.annotation.behavior.WritesAttributes;
import org.apache.nifi.annotation.lifecycle.OnScheduled;
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.processor.exception.ProcessException;
import org.apache.nifi.processor.io.InputStreamCallback;
import org.apache.nifi.processor.io.OutputStreamCallback;
import org.apache.nifi.processor.util.StandardValidators;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.*;
import java.util.concurrent.atomic.AtomicReference;
@Tags({"example"})
@CapabilityDescription("Provide a description")
@SeeAlso({})
@ReadsAttributes({@ReadsAttribute(attribute="", description="")})
@WritesAttributes({@WritesAttribute(attribute="", description="")})
public class ClientProcessor extends AbstractProcessor {
public static final PropertyDescriptor MY_PROPERTY = new PropertyDescriptor
.Builder().name("My Property")
.description("Example Property")
.required(true)
.addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
.build();
public static final Relationship MY_RELATIONSHIP = new Relationship.Builder()
.name("my_relationship")
.description("Example relationship")
.build();
private List<PropertyDescriptor> descriptors;
private Set<Relationship> relationships;
@Override
protected void init(final ProcessorInitializationContext context) {
final List<PropertyDescriptor> descriptors = new ArrayList<PropertyDescriptor>();
descriptors.add(MY_PROPERTY);
this.descriptors = Collections.unmodifiableList(descriptors);
final Set<Relationship> relationships = new HashSet<Relationship>();
relationships.add(MY_RELATIONSHIP);
this.relationships = Collections.unmodifiableSet(relationships);
}
@Override
public Set<Relationship> getRelationships() {
return this.relationships;
}
@Override
public final List<PropertyDescriptor> getSupportedPropertyDescriptors() {
return descriptors;
}
@OnScheduled
public void onScheduled(final ProcessContext context) {
}
@Override
public void onTrigger(final ProcessContext context, final ProcessSession session) throws ProcessException, SchedulerException {
FlowFile flowFile = session.get();
final AtomicReference<String> value = new AtomicReference<>();
if ( flowFile == null ) {
return;
}
session.read(flowFile, new InputStreamCallback() {
@Override
public void process(InputStream in) throws IOException {// here InputStream "in" would be your inputstream which is coming from some other processor like GetFile or your sftp server.
String input = IOUtils.toString(in, "UTF-8");
JobRunner job = new JobRunner(input); // you can pass also in as inputstream of your file or direct file content which is in string format.
job.run();
value.set(input);
}
});
flowFile = session.write(flowFile, new OutputStreamCallback() {
@Override
public void process(OutputStream out) throws IOException {
out.write(value.toString().getBytes());
}
});
flowFile = session.putAttribute(flowFile, CoreAttributes.MIME_TYPE.key(), "application/csv");
}
}
it is the code to create a custom processor for nifi.
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