org.apache.pulsar.functions.source.PushPulsarSource Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
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* 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
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* specific language governing permissions and limitations
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*/
package org.apache.pulsar.functions.source;
import java.util.Map;
import java.util.concurrent.LinkedBlockingQueue;
import org.apache.pulsar.client.api.PulsarClient;
import org.apache.pulsar.functions.api.Record;
import org.apache.pulsar.io.core.SourceContext;
public abstract class PushPulsarSource extends PulsarSource {
private LinkedBlockingQueue> queue;
private static final int DEFAULT_QUEUE_LENGTH = 1000;
public PushPulsarSource(PulsarClient pulsarClient,
PulsarSourceConfig pulsarSourceConfig,
Map properties,
ClassLoader functionClassLoader) {
super(pulsarClient, pulsarSourceConfig, properties, functionClassLoader);
this.queue = new LinkedBlockingQueue<>(this.getQueueLength());
}
@Override
public Record read() throws Exception {
return queue.take();
}
/**
* Open connector with configuration.
*
* @param config initialization config
* @param sourceContext environment where the source connector is running
* @throws Exception IO type exceptions when opening a connector
*/
public abstract void open(Map config, SourceContext sourceContext) throws Exception;
/**
* Attach a consumer function to this Source. This is invoked by the implementation
* to pass messages whenever there is data to be pushed to Pulsar.
*
* @param record next message from source which should be sent to a Pulsar topic
*/
public void consume(Record record) {
try {
queue.put(record);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
/**
* Get length of the queue that records are push onto
* Users can override this method to customize the queue length.
* @return queue length
*/
public int getQueueLength() {
return DEFAULT_QUEUE_LENGTH;
}
}