Github user MikeThomsen commented on a diff in the pull request:
https://github.com/apache/nifi/pull/2553#discussion_r174873036
--- Diff:
nifi-nar-bundles/nifi-pulsar-bundle/nifi-pulsar-client-service/src/main/java/org/apache/nifi/pulsar/StandardPulsarClientPool.java
---
@@ -0,0 +1,300 @@
+/*
+ * 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.pulsar;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.annotation.lifecycle.OnEnabled;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.controller.AbstractControllerService;
+import org.apache.nifi.controller.ConfigurationContext;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.apache.nifi.pulsar.pool.PulsarConsumerFactory;
+import org.apache.nifi.pulsar.pool.PulsarProducerFactory;
+import org.apache.nifi.pulsar.pool.ResourcePool;
+import org.apache.nifi.pulsar.pool.ResourcePoolImpl;
+import org.apache.nifi.reporting.InitializationException;
+import org.apache.nifi.ssl.SSLContextService;
+import org.apache.pulsar.client.api.ClientConfiguration;
+import org.apache.pulsar.client.api.PulsarClient;
+import
org.apache.pulsar.client.api.PulsarClientException.UnsupportedAuthenticationException;
+import org.apache.pulsar.client.impl.auth.AuthenticationTls;
+
+@Tags({ "Pulsar"})
+@CapabilityDescription("Standard ControllerService implementation of
PulsarClientService.")
+public class StandardPulsarClientPool extends AbstractControllerService
implements PulsarClientPool {
+
+ public static final PropertyDescriptor PULSAR_SERVICE_URL = new
PropertyDescriptor
+ .Builder().name("PULSAR_SERVICE_URL")
+ .displayName("Pulsar Service URL")
+ .description("URL for the Pulsar cluster, e.g localhost:6650")
+ .required(true)
+ .addValidator(StandardValidators.HOSTNAME_PORT_LIST_VALIDATOR)
+ .build();
+
+ public static final PropertyDescriptor CONCURRENT_LOOKUP_REQUESTS =
new PropertyDescriptor.Builder()
+ .name("Maximum concurrent lookup-requests")
+ .description("Number of concurrent lookup-requests allowed on
each broker-connection to prevent "
+ + "overload on broker. (default: 5000) It should be
configured with higher value only in case "
+ + "of it requires to produce/subscribe on thousands of
topics")
+ .required(false)
+ .addValidator(StandardValidators.POSITIVE_INTEGER_VALIDATOR)
+ .defaultValue("5000")
+ .build();
+
+ public static final PropertyDescriptor CONNECTIONS_PER_BROKER = new
PropertyDescriptor.Builder()
+ .name("Maximum connects per Pulsar broker")
+ .description("Sets the max number of connection that the
client library will open to a single broker.\n" +
+ "By default, the connection pool will use a single
connection for all the producers and consumers. " +
+ "Increasing this parameter may improve throughput when
using many producers over a high latency connection")
+ .required(false)
+ .addValidator(StandardValidators.POSITIVE_INTEGER_VALIDATOR)
+ .defaultValue("1")
+ .build();
+
+ public static final PropertyDescriptor IO_THREADS = new
PropertyDescriptor.Builder()
+ .name("I/O Threads")
+ .description("The number of threads to be used for handling
connections to brokers (default: 1 thread)")
+ .required(false)
+ .addValidator(StandardValidators.POSITIVE_INTEGER_VALIDATOR)
+ .defaultValue("1")
+ .build();
+
+ public static final PropertyDescriptor LISTENER_THREADS = new
PropertyDescriptor.Builder()
+ .name("Listener Threads")
+ .description("The number of threads to be used for message
listeners (default: 1 thread)")
+ .required(false)
+ .addValidator(StandardValidators.POSITIVE_INTEGER_VALIDATOR)
+ .defaultValue("1")
+ .build();
+
+ public static final PropertyDescriptor MAXIMUM_REJECTED_REQUESTS = new
PropertyDescriptor.Builder()
+ .name("Maximum rejected requests per connection")
+ .description("Max number of broker-rejected requests in a
certain time-frame (30 seconds) after " +
+ "which current connection will be closed and client
creates a new connection that give " +
+ "chance to connect a different broker (default: 50)")
+ .required(false)
+ .addValidator(StandardValidators.POSITIVE_INTEGER_VALIDATOR)
+ .defaultValue("50")
+ .build();
+
+ public static final PropertyDescriptor OPERATION_TIMEOUT = new
PropertyDescriptor.Builder()
+ .name("Operation Timeout")
+ .description("Producer-create, subscribe and unsubscribe
operations will be retried until this " +
+ "interval, after which the operation will be maked as
failed (default: 30 seconds)")
+ .required(false)
+ .addValidator(StandardValidators.POSITIVE_INTEGER_VALIDATOR)
+ .defaultValue("30")
+ .build();
+
+ public static final PropertyDescriptor STATS_INTERVAL = new
PropertyDescriptor.Builder()
+ .name("Stats interval")
+ .description("The interval between each stat info (default: 60
seconds) Stats will be activated " +
+ "with positive statsIntervalSeconds It should be set to at
least 1 second")
+ .required(false)
+ .addValidator(StandardValidators.POSITIVE_INTEGER_VALIDATOR)
+ .defaultValue("60")
+ .build();
+
+ public static final PropertyDescriptor USE_TCP_NO_DELAY = new
PropertyDescriptor.Builder()
+ .name("Use TCP nodelay flag")
+ .description("Configure whether to use TCP no-delay flag on
the connection, to disable Nagle algorithm.\n"
+ + "No-delay features make sure packets are sent out on
the network as soon as possible, and it's critical "
+ + "to achieve low latency publishes. On the other
hand, sending out a huge number of small packets might "
+ + "limit the overall throughput, so if latency is not
a concern, it's advisable to set the useTcpNoDelay "
+ + "flag to false.")
+ .required(false)
+ .addValidator(StandardValidators.BOOLEAN_VALIDATOR)
+ .defaultValue("false")
+ .build();
+
+ public static final PropertyDescriptor MAX_PRODUCERS = new
PropertyDescriptor
+ .Builder().name("MAX_PRODUCERS")
+ .displayName("Producer Pool Size")
+ .description("The Maximum Number of Pulsar Producers created
by this Pulsar Client Pool")
+ .required(true)
+ .defaultValue("10")
+
.addValidator(StandardValidators.NON_NEGATIVE_INTEGER_VALIDATOR)
+ .build();
+
+ public static final PropertyDescriptor MAX_CONSUMERS = new
PropertyDescriptor
+ .Builder().name("MAX_CONSUMERS")
+ .displayName("Consumer Pool Size")
+ .description("The Maximum Number of Pulsar consumers created
by this Pulsar Client Pool")
+ .required(true)
+ .defaultValue("10")
+
.addValidator(StandardValidators.NON_NEGATIVE_INTEGER_VALIDATOR)
+ .build();
+
+ public static final PropertyDescriptor SSL_CONTEXT_SERVICE = new
PropertyDescriptor.Builder()
+ .name("ssl.context.service")
+ .displayName("SSL Context Service")
+ .description("Specifies the SSL Context Service to use for
communicating with Pulsar.")
+ .required(false)
+ .identifiesControllerService(SSLContextService.class)
+ .build();
+
+ private static final List<PropertyDescriptor> properties;
+ private volatile PulsarClient client;
+
+ private volatile ResourcePoolImpl<PulsarProducer> producers;
+ private volatile ResourcePoolImpl<PulsarConsumer> consumers;
+ private ClientConfiguration clientConfig;
+
+ static {
+ final List<PropertyDescriptor> props = new ArrayList<>();
+ props.add(PULSAR_SERVICE_URL);
+ props.add(MAX_CONSUMERS);
+ props.add(MAX_PRODUCERS);
+ props.add(CONCURRENT_LOOKUP_REQUESTS);
+ props.add(CONNECTIONS_PER_BROKER);
+ props.add(IO_THREADS);
+ props.add(LISTENER_THREADS);
+ props.add(MAXIMUM_REJECTED_REQUESTS);
+ props.add(OPERATION_TIMEOUT);
+ props.add(STATS_INTERVAL);
+ props.add(USE_TCP_NO_DELAY);
+ properties = Collections.unmodifiableList(props);
+ }
+
+ @Override
+ protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
+ return properties;
+ }
+
+ /**
+ * @param context
+ * the configuration context
+ * @throws InitializationException
+ * if unable to create a database connection
+ */
+ @OnEnabled
+ public void onEnabled(final ConfigurationContext context) throws
InitializationException {
+
+ createClient(context);
+
+ if (this.client == null)
+ throw new InitializationException("Unable to create Pulsar
Client");
+
+ producers = new ResourcePoolImpl<PulsarProducer>(new
PulsarProducerFactory(client), context.getProperty(MAX_PRODUCERS).asInteger());
+ consumers = new ResourcePoolImpl<PulsarConsumer>(new
PulsarConsumerFactory(client), context.getProperty(MAX_CONSUMERS).asInteger());
+
+ }
+
+ private void createClient(final ConfigurationContext context) throws
InitializationException {
+
+ // We can't create a client without a service URL.
+ if (!context.getProperty(PULSAR_SERVICE_URL).isSet()) {
+ return;
+ }
+
+ try {
+ this.client =
PulsarClient.create(buildPulsarBrokerRootUrl(context.getProperty(PULSAR_SERVICE_URL).getValue(),
+ getClientConfig(context).isUseTls()),
getClientConfig(context));
+
+ } catch (Exception e) {
+ throw new InitializationException("Unable to create Pulsar
Client", e);
+ }
+
+ }
+
+ private static String buildPulsarBrokerRootUrl(String uri, boolean
tlsEnabled) {
+ StringBuilder builder = new StringBuilder();
+ builder.append("pulsar");
+
+ if (tlsEnabled)
--- End diff --
Please add curly brackets.
---
