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/*
* Copyright (c) 2008-2023, Hazelcast, Inc. All Rights Reserved.
*
* Licensed 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.hazelcast.jet.cdc;
import com.hazelcast.function.BiFunctionEx;
import com.hazelcast.jet.annotation.EvolvingApi;
import com.hazelcast.jet.cdc.impl.CdcSourceP;
import com.hazelcast.jet.cdc.impl.ChangeRecordCdcSourceP;
import com.hazelcast.jet.cdc.impl.ConstantSequenceExtractor;
import com.hazelcast.jet.cdc.impl.DebeziumConfig;
import com.hazelcast.jet.cdc.impl.JsonCdcSourceP;
import com.hazelcast.jet.core.EventTimePolicy;
import com.hazelcast.jet.core.ProcessorMetaSupplier;
import com.hazelcast.jet.core.ProcessorSupplier;
import com.hazelcast.jet.pipeline.Sources;
import com.hazelcast.jet.pipeline.StreamSource;
import org.apache.kafka.connect.source.SourceConnector;
import javax.annotation.Nonnull;
import java.util.Map.Entry;
import java.util.Properties;
import static com.hazelcast.internal.util.Preconditions.checkState;
/**
* Contains factory methods for creating Change Data Capture (CDC) sources.
*
* Note: It is better to use first-class CDC sources than this generic one
* because it has less functionality. For example, these sources lack
* sequence numbers, so functionality based on them (like reordering
* protection in {@link CdcSinks}) is disabled.
*
* @since Jet 4.2
*/
@EvolvingApi
public final class DebeziumCdcSources {
private DebeziumCdcSources() {
}
/**
* Creates a CDC source that streams change data from a
* Debezium-supported database to a Hazelcast Jet pipeline.
*
* @param name the name of this source, must unique, will be passed
* to the underlying Kafka Connect source
* @param connectorClass name of the Debezium connector class
* @return a builder you can use to set the source's properties and
* then construct it
*/
@Nonnull
public static Builder debezium(@Nonnull String name, @Nonnull String connectorClass) {
return new Builder<>(name, connectorClass,
(properties, eventTimePolicy) -> new ChangeRecordCdcSourceP(properties, eventTimePolicy));
}
/**
* Creates a CDC source that streams change data from a
* Debezium-supported database to a Hazelcast Jet pipeline.
*
* @param name the name of this source, must unique, will be passed
* to the underlying Kafka Connect source
* @param connectorClass class of the Debezium Connector which will be used for the CDC
* @return a builder you can use to set the source's properties and
* then construct it
*/
@Nonnull
public static Builder debezium(
@Nonnull String name,
@Nonnull Class connectorClass) {
checkState(SourceConnector.class.isAssignableFrom(connectorClass), "connector class must be a subclass" +
" of SourceConnector");
return new Builder<>(name, connectorClass.getName(),
(properties, eventTimePolicy) -> new ChangeRecordCdcSourceP(properties, eventTimePolicy));
}
/**
* Creates a CDC source that streams change data from a
* Debezium-supported database to a Hazelcast Jet pipeline.
*
* Differs from the {@link #debezium(String, String) regular source}
* in that it does the least possible amount of processing of the
* raw Debezium data. Just returns a pair of JSON strings, one is
* the key of the Debezium CDC event, the other the value.
*
* @param name the name of this source, must unique, will be passed
* to the underlying Kafka Connect source
* @param connectorClass name of the Debezium connector class
* @return a builder you can use to set the source's properties and then construct it
*/
@Nonnull
public static Builder> debeziumJson(@Nonnull String name, @Nonnull String connectorClass) {
return new Builder<>(name, connectorClass,
(properties, eventTimePolicy) -> new JsonCdcSourceP(properties, eventTimePolicy));
}
/**
* Creates a CDC source that streams change data from a
* Debezium-supported database to a Hazelcast Jet pipeline.
*
* Differs from the {@link #debezium(String, String) regular source}
* in that it does the least possible amount of processing of the
* raw Debezium data. Just returns a pair of JSON strings, one is
* the key of the Debezium CDC event, the other the value.
*
* @param name the name of this source, must unique, will be passed
* to the underlying Kafka Connect source
* @param connectorClass class of the Debezium Connector which will be used for the CDC
* @return a builder you can use to set the source's properties and then construct it
*/
@Nonnull
public static Builder> debeziumJson(
@Nonnull String name,
@Nonnull Class connectorClass) {
checkState(SourceConnector.class.isAssignableFrom(connectorClass), "connector class must be a subclass" +
" of SourceConnector");
return new Builder<>(name, connectorClass.getName(),
(properties, eventTimePolicy) -> new JsonCdcSourceP(properties, eventTimePolicy));
}
/**
* A builder to configure a CDC source that streams the change data from
* a Debezium-supported database to Hazelcast Jet.
*
* @param type of items handled by the source
*/
public static final class Builder {
private final BiFunctionEx, CdcSourceP> createProcessorFn;
private final DebeziumConfig config;
private Builder(
@Nonnull String name,
@Nonnull String connectorClass,
@Nonnull BiFunctionEx, CdcSourceP> createProcessorFn
) {
config = new DebeziumConfig(name, connectorClass);
config.setProperty(CdcSourceP.SEQUENCE_EXTRACTOR_CLASS_PROPERTY, ConstantSequenceExtractor.class.getName());
this.createProcessorFn = createProcessorFn;
}
/**
* Sets a source property. These properties are passed to Debezium.
*/
@Nonnull
public Builder setProperty(@Nonnull String key, @Nonnull String value) {
config.setProperty(key, value);
return this;
}
/**
* Returns the CDC source based on the properties set.
*/
@Nonnull
public StreamSource build() {
Properties properties = config.toProperties();
BiFunctionEx, CdcSourceP> createProcessorFn =
this.createProcessorFn;
return Sources.streamFromProcessorWithWatermarks(
properties.getProperty(CdcSourceP.NAME_PROPERTY),
true,
eventTimePolicy -> {
ProcessorSupplier supplier = ProcessorSupplier.of(
() -> createProcessorFn.apply(properties, eventTimePolicy));
return ProcessorMetaSupplier.forceTotalParallelismOne(supplier);
});
}
}
}