kafka SourceConnector 源码
kafka SourceConnector 代码
文件路径:/connect/api/src/main/java/org/apache/kafka/connect/source/SourceConnector.java
/*
* 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.kafka.connect.source;
import org.apache.kafka.connect.connector.Connector;
import java.util.Map;
/**
* SourceConnectors implement the connector interface to pull data from another system and send
* it to Kafka.
*/
public abstract class SourceConnector extends Connector {
@Override
protected SourceConnectorContext context() {
return (SourceConnectorContext) context;
}
/**
* Signals whether the connector supports exactly-once delivery guarantees with a proposed configuration.
* Connector authors can assume that worker-level exactly-once support is enabled when this method is invoked.
*
* <p>For backwards compatibility, the default implementation will return {@code null}, but connector authors are
* strongly encouraged to override this method to return a non-null value such as
* {@link ExactlyOnceSupport#SUPPORTED SUPPORTED} or {@link ExactlyOnceSupport#UNSUPPORTED UNSUPPORTED}.
*
* <p>Similar to {@link #validate(Map) validate}, this method may be called by the runtime before the
* {@link #start(Map) start} method is invoked when the connector will be run with exactly-once support.
*
* @param connectorConfig the configuration that will be used for the connector.
* @return {@link ExactlyOnceSupport#SUPPORTED} if the connector can provide exactly-once support with the given
* configuration, and {@link ExactlyOnceSupport#UNSUPPORTED} if it cannot. If this method is overridden by a
* connector, should not be {@code null}, but if {@code null}, it will be assumed that the connector cannot provide
* exactly-once guarantees.
* @since 3.3
*/
public ExactlyOnceSupport exactlyOnceSupport(Map<String, String> connectorConfig) {
return null;
}
/**
* Signals whether the connector implementation is capable of defining the transaction boundaries for a
* connector with the given configuration. This method is called before {@link #start(Map)}, only when the
* runtime supports exactly-once and the connector configuration includes {@code transaction.boundary=connector}.
*
* <p>This method need not be implemented if the connector implementation does not support defining
* transaction boundaries.
*
* @param connectorConfig the configuration that will be used for the connector
* @return {@link ConnectorTransactionBoundaries#SUPPORTED} if the connector will define its own transaction boundaries,
* or {@link ConnectorTransactionBoundaries#UNSUPPORTED} otherwise; may never be {@code null}. The default implementation
* returns {@link ConnectorTransactionBoundaries#UNSUPPORTED}.
* @since 3.3
* @see TransactionContext
*/
public ConnectorTransactionBoundaries canDefineTransactionBoundaries(Map<String, String> connectorConfig) {
return ConnectorTransactionBoundaries.UNSUPPORTED;
}
}
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