Github user srdo commented on a diff in the pull request:
https://github.com/apache/storm/pull/1808#discussion_r96904191
--- Diff:
external/storm-kafka-client/src/main/java/org/apache/storm/kafka/spout/KafkaSpoutConfig.java
---
@@ -61,129 +66,244 @@
* If no offset has been committed, it behaves as LATEST.</li>
* </ul>
* */
- public enum FirstPollOffsetStrategy {
+ public static enum FirstPollOffsetStrategy {
EARLIEST,
LATEST,
UNCOMMITTED_EARLIEST,
UNCOMMITTED_LATEST }
-
- // Kafka consumer configuration
- private final Map<String, Object> kafkaProps;
- private final Deserializer<K> keyDeserializer;
- private final Deserializer<V> valueDeserializer;
- private final long pollTimeoutMs;
-
- // Kafka spout configuration
- private final long offsetCommitPeriodMs;
- private final int maxRetries;
- private final int maxUncommittedOffsets;
- private final long partitionRefreshPeriodMs;
- private final boolean manualPartitionAssignment;
- private final FirstPollOffsetStrategy firstPollOffsetStrategy;
- private final KafkaSpoutStreams kafkaSpoutStreams;
- private final KafkaSpoutTuplesBuilder<K, V> tuplesBuilder;
- private final KafkaSpoutRetryService retryService;
-
- private KafkaSpoutConfig(Builder<K,V> builder) {
- this.kafkaProps = setDefaultsAndGetKafkaProps(builder.kafkaProps);
- this.keyDeserializer = builder.keyDeserializer;
- this.valueDeserializer = builder.valueDeserializer;
- this.pollTimeoutMs = builder.pollTimeoutMs;
- this.offsetCommitPeriodMs = builder.offsetCommitPeriodMs;
- this.maxRetries = builder.maxRetries;
- this.firstPollOffsetStrategy = builder.firstPollOffsetStrategy;
- this.kafkaSpoutStreams = builder.kafkaSpoutStreams;
- this.maxUncommittedOffsets = builder.maxUncommittedOffsets;
- this.partitionRefreshPeriodMs = builder.partitionRefreshPeriodMs;
- this.manualPartitionAssignment = builder.manualPartitionAssignment;
- this.tuplesBuilder = builder.tuplesBuilder;
- this.retryService = builder.retryService;
+
+ public static Builder<String, String> builder(String bootstrapServers,
String ... topics) {
+ return new Builder<>(bootstrapServers, StringDeserializer.class,
StringDeserializer.class, topics);
}
-
- private Map<String, Object> setDefaultsAndGetKafkaProps(Map<String,
Object> kafkaProps) {
+
+ public static Builder<String, String> builder(String bootstrapServers,
Collection<String> topics) {
+ return new Builder<>(bootstrapServers, StringDeserializer.class,
StringDeserializer.class, topics);
+ }
+
+ public static Builder<String, String> builder(String bootstrapServers,
Pattern topics) {
+ return new Builder<>(bootstrapServers, StringDeserializer.class,
StringDeserializer.class, topics);
+ }
+
+ private static Map<String, Object>
setDefaultsAndGetKafkaProps(Map<String, Object> kafkaProps) {
// set defaults for properties not specified
- if (!kafkaProps.containsKey(Consumer.ENABLE_AUTO_COMMIT)) {
- kafkaProps.put(Consumer.ENABLE_AUTO_COMMIT, "false");
+ if
(!kafkaProps.containsKey(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG)) {
+ kafkaProps.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG,
"false");
}
return kafkaProps;
}
-
+
public static class Builder<K,V> {
private final Map<String, Object> kafkaProps;
- private SerializableDeserializer<K> keyDeserializer;
- private SerializableDeserializer<V> valueDeserializer;
+ private Subscription subscription;
+ private final SerializableDeserializer<K> keyDes;
+ private final Class<? extends Deserializer<K>> keyDesClazz;
+ private final SerializableDeserializer<V> valueDes;
+ private final Class<? extends Deserializer<V>> valueDesClazz;
+ private RecordTranslator<K, V> translator;
private long pollTimeoutMs = DEFAULT_POLL_TIMEOUT_MS;
private long offsetCommitPeriodMs =
DEFAULT_OFFSET_COMMIT_PERIOD_MS;
private int maxRetries = DEFAULT_MAX_RETRIES;
private FirstPollOffsetStrategy firstPollOffsetStrategy =
FirstPollOffsetStrategy.UNCOMMITTED_EARLIEST;
- private final KafkaSpoutStreams kafkaSpoutStreams;
private int maxUncommittedOffsets =
DEFAULT_MAX_UNCOMMITTED_OFFSETS;
+ private KafkaSpoutRetryService retryService =
DEFAULT_RETRY_SERVICE;
private long partitionRefreshPeriodMs =
DEFAULT_PARTITION_REFRESH_PERIOD_MS;
- private boolean manualPartitionAssignment = false;
- private final KafkaSpoutTuplesBuilder<K, V> tuplesBuilder;
- private final KafkaSpoutRetryService retryService;
-
- /**
- * Please refer to javadoc in {@link #Builder(Map,
KafkaSpoutStreams, KafkaSpoutTuplesBuilder, KafkaSpoutRetryService)}.<p/>
- * This constructor uses by the default the following
implementation for {@link KafkaSpoutRetryService}:<p/>
- * {@code new
KafkaSpoutRetryExponentialBackoff(TimeInterval.seconds(0),
TimeInterval.milliSeconds(2),
- * DEFAULT_MAX_RETRIES, TimeInterval.seconds(10)))}
- */
- public Builder(Map<String, Object> kafkaProps, KafkaSpoutStreams
kafkaSpoutStreams,
- KafkaSpoutTuplesBuilder<K,V> tuplesBuilder) {
- this(kafkaProps, kafkaSpoutStreams, tuplesBuilder,
- new
KafkaSpoutRetryExponentialBackoff(TimeInterval.seconds(0),
TimeInterval.milliSeconds(2),
- DEFAULT_MAX_RETRIES,
TimeInterval.seconds(10)));
+
+ public Builder(String bootstrapServers,
SerializableDeserializer<K> keyDes, SerializableDeserializer<V> valDes, String
... topics) {
+ this(bootstrapServers, keyDes, valDes, new
NamedSubscription(topics));
}
-
- /***
- * KafkaSpoutConfig defines the required configuration to connect
a consumer to a consumer group, as well as the subscribing topics
- * The optional configuration can be specified using the set
methods of this builder
- * @param kafkaProps properties defining consumer connection to
Kafka broker as specified in @see <a
href="http://kafka.apache.org/090/javadoc/index.html?org/apache/kafka/clients/consumer/KafkaConsumer.html";>KafkaConsumer</a>
- * @param kafkaSpoutStreams streams to where the tuples are
emitted for each tuple. Multiple topics can emit in the same stream.
- * @param tuplesBuilder logic to build tuples from {@link
ConsumerRecord}s.
- * @param retryService logic that manages the retrial of failed
tuples
- */
- public Builder(Map<String, Object> kafkaProps, KafkaSpoutStreams
kafkaSpoutStreams,
- KafkaSpoutTuplesBuilder<K,V> tuplesBuilder,
KafkaSpoutRetryService retryService) {
- if (kafkaProps == null || kafkaProps.isEmpty()) {
- throw new IllegalArgumentException("Properties defining
consumer connection to Kafka broker are required: " + kafkaProps);
- }
-
- if (kafkaSpoutStreams == null) {
- throw new IllegalArgumentException("Must specify stream
associated with each topic. Multiple topics can emit to the same stream");
- }
-
- if (tuplesBuilder == null) {
- throw new IllegalArgumentException("Must specify at last
one tuple builder per topic declared in KafkaSpoutStreams");
- }
-
- if (retryService == null) {
- throw new IllegalArgumentException("Must specify at
implementation of retry service");
+
+ public Builder(String bootstrapServers,
SerializableDeserializer<K> keyDes, SerializableDeserializer<V> valDes,
Collection<String> topics) {
+ this(bootstrapServers, keyDes, valDes, new
NamedSubscription(topics));
+ }
+
+ public Builder(String bootstrapServers,
SerializableDeserializer<K> keyDes, SerializableDeserializer<V> valDes, Pattern
topics) {
+ this(bootstrapServers, keyDes, valDes, new
PatternSubscription(topics));
+ }
+
+ public Builder(String bootstrapServers,
SerializableDeserializer<K> keyDes, SerializableDeserializer<V> valDes,
Subscription subscription) {
+ this(bootstrapServers, keyDes, null, valDes, null,
subscription);
+ }
+
+ public Builder(String bootstrapServers, Class<? extends
Deserializer<K>> keyDes, Class<? extends Deserializer<V>> valDes, String ...
topics) {
+ this(bootstrapServers, keyDes, valDes, new
NamedSubscription(topics));
+ }
+
+ public Builder(String bootstrapServers, Class<? extends
Deserializer<K>> keyDes, Class<? extends Deserializer<V>> valDes,
Collection<String> topics) {
+ this(bootstrapServers, keyDes, valDes, new
NamedSubscription(topics));
+ }
+
+ public Builder(String bootstrapServers, Class<? extends
Deserializer<K>> keyDes, Class<? extends Deserializer<V>> valDes, Pattern
topics) {
+ this(bootstrapServers, keyDes, valDes, new
PatternSubscription(topics));
+ }
+
+ public Builder(String bootstrapServers, Class<? extends
Deserializer<K>> keyDes, Class<? extends Deserializer<V>> valDes, Subscription
subscription) {
+ this(bootstrapServers, null, keyDes, null, valDes,
subscription);
+ }
+
+ private Builder(String bootstrapServers,
SerializableDeserializer<K> keyDes, Class<? extends Deserializer<K>>
keyDesClazz,
+ SerializableDeserializer<V> valDes, Class<? extends
Deserializer<V>> valDesClazz, Subscription subscription) {
+ kafkaProps = new HashMap<>();
+ if (bootstrapServers == null || bootstrapServers.isEmpty()) {
+ throw new IllegalArgumentException("bootstrap servers
cannot be null");
}
+ kafkaProps.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,
bootstrapServers);
+ this.keyDes = keyDes;
+ this.keyDesClazz = keyDesClazz;
+ this.valueDes = valDes;
+ this.valueDesClazz = valDesClazz;
+ this.subscription = subscription;
+ this.translator = new DefaultRecordTranslator<K,V>();
+ }
- this.kafkaProps = kafkaProps;
- this.kafkaSpoutStreams = kafkaSpoutStreams;
- this.tuplesBuilder = tuplesBuilder;
- this.retryService = retryService;
+ private Builder(Builder<?, ?> builder, SerializableDeserializer<K>
keyDes, Class<? extends Deserializer<K>> keyDesClazz,
+ SerializableDeserializer<V> valueDes, Class<? extends
Deserializer<V>> valueDesClazz) {
+ this.kafkaProps = new HashMap<>(builder.kafkaProps);
+ this.subscription = builder.subscription;
+ this.pollTimeoutMs = builder.pollTimeoutMs;
+ this.offsetCommitPeriodMs = builder.offsetCommitPeriodMs;
+ this.maxRetries = builder.maxRetries;
+ this.firstPollOffsetStrategy = builder.firstPollOffsetStrategy;
+ this.maxUncommittedOffsets = builder.maxUncommittedOffsets;
+ //this could result in a lot of class case exceptions at
runtime,
+ // but this is the only way to really maintain API
compatibility
+ this.translator = (RecordTranslator<K, V>) builder.translator;
+ this.retryService = builder.retryService;
+ this.keyDes = keyDes;
+ this.keyDesClazz = keyDesClazz;
+ this.valueDes = valueDes;
+ this.valueDesClazz = valueDesClazz;
}
/**
* Specifying this key deserializer overrides the property
key.deserializer
*/
- public Builder<K,V> setKeyDeserializer(SerializableDeserializer<K>
keyDeserializer) {
- this.keyDeserializer = keyDeserializer;
- return this;
+ public <NK> Builder<NK,V> setKey(SerializableDeserializer<NK>
keyDeserializer) {
--- End diff --
I think what I was asking was "Why would you need to create a Builder with
key type A and then later set a deserializer for keys of type B"? :)
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