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[FLINK-10440][cassandra] Add CassandraPojoOutputFormat
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.../src/main/java/org/apache/flink/batch/connectors/cassandra/CassandraPojoOutputFormat.java
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| /* | ||
| * 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 | ||
| * | ||
| * https://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. | ||
| */ | ||
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| package org.apache.flink.batch.connectors.cassandra; | ||
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| import org.apache.flink.api.common.io.RichOutputFormat; | ||
| import org.apache.flink.configuration.Configuration; | ||
| import org.apache.flink.streaming.connectors.cassandra.ClusterBuilder; | ||
| import org.apache.flink.streaming.connectors.cassandra.MapperOptions; | ||
| import org.apache.flink.util.Preconditions; | ||
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| import com.datastax.driver.core.Cluster; | ||
| import com.datastax.driver.core.Session; | ||
| import com.datastax.driver.mapping.Mapper; | ||
| import com.datastax.driver.mapping.MappingManager; | ||
| import com.google.common.util.concurrent.FutureCallback; | ||
| import com.google.common.util.concurrent.Futures; | ||
| import com.google.common.util.concurrent.ListenableFuture; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| import java.io.IOException; | ||
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| /** | ||
| * OutputFormat to write data to Apache Cassandra and from a custom Cassandra annotated object. | ||
| * | ||
| * @param <OUT> type of outputClass | ||
| */ | ||
| public class CassandraPojoOutputFormat<OUT> extends RichOutputFormat<OUT> { | ||
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| private static final Logger LOG = LoggerFactory.getLogger(CassandraPojoOutputFormat.class); | ||
| private static final long serialVersionUID = -1701885135103942460L; | ||
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| private final ClusterBuilder builder; | ||
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| private final MapperOptions mapperOptions; | ||
| private final Class<OUT> outputClass; | ||
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| private transient Cluster cluster; | ||
| private transient Session session; | ||
| private transient Mapper<OUT> mapper; | ||
| private transient FutureCallback<Void> callback; | ||
| private transient Throwable exception = null; | ||
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| public CassandraPojoOutputFormat(ClusterBuilder builder, Class<OUT> outputClass) { | ||
| this(builder, outputClass, null); | ||
| } | ||
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| public CassandraPojoOutputFormat(ClusterBuilder builder, Class<OUT> outputClass, MapperOptions mapperOptions) { | ||
| Preconditions.checkNotNull(outputClass, "OutputClass cannot be null"); | ||
| Preconditions.checkNotNull(builder, "Builder cannot be null"); | ||
| this.builder = builder; | ||
| this.mapperOptions = mapperOptions; | ||
| this.outputClass = outputClass; | ||
| } | ||
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| @Override | ||
| public void configure(Configuration parameters) { | ||
| this.cluster = builder.getCluster(); | ||
| } | ||
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| /** | ||
| * Opens a Session to Cassandra and initializes the prepared statement. | ||
| * | ||
| * @param taskNumber The number of the parallel instance. | ||
| */ | ||
| @Override | ||
| public void open(int taskNumber, int numTasks) { | ||
| this.session = cluster.connect(); | ||
| MappingManager mappingManager = new MappingManager(session); | ||
| this.mapper = mappingManager.mapper(outputClass); | ||
| if (mapperOptions != null) { | ||
| Mapper.Option[] optionsArray = mapperOptions.getMapperOptions(); | ||
| if (optionsArray != null) { | ||
| mapper.setDefaultSaveOptions(optionsArray); | ||
| } | ||
| } | ||
| this.callback = new FutureCallback<Void>() { | ||
| @Override | ||
| public void onSuccess(Void ignored) { | ||
| onWriteSuccess(); | ||
| } | ||
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| @Override | ||
| public void onFailure(Throwable t) { | ||
| onWriteFailure(t); | ||
| } | ||
| }; | ||
| } | ||
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| @Override | ||
| public void writeRecord(OUT record) throws IOException { | ||
| if (exception != null) { | ||
| throw new IOException("write record failed", exception); | ||
| } | ||
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| ListenableFuture<Void> result = mapper.saveAsync(record); | ||
| Futures.addCallback(result, callback); | ||
| } | ||
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| /** | ||
| * Callback that is invoked after a record is written to Cassandra successfully. | ||
| * | ||
| * <p>Subclass can override to provide its own logic. | ||
| */ | ||
| protected void onWriteSuccess() { | ||
| } | ||
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| /** | ||
| * Callback that is invoked when failing to write to Cassandra. | ||
| * Current implementation will record the exception and fail the job upon next record. | ||
| * | ||
| * <p>Subclass can override to provide its own failure handling logic. | ||
| * @param t the exception | ||
| */ | ||
| protected void onWriteFailure(Throwable t) { | ||
| exception = t; | ||
| } | ||
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| /** | ||
| * Closes all resources used. | ||
| */ | ||
| @Override | ||
| public void close() { | ||
| mapper = null; | ||
| try { | ||
| if (session != null) { | ||
| session.close(); | ||
| } | ||
| } catch (Exception e) { | ||
| LOG.error("Error while closing session.", e); | ||
| } | ||
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| try { | ||
| if (cluster != null) { | ||
| cluster.close(); | ||
| } | ||
| } catch (Exception e) { | ||
| LOG.error("Error while closing cluster.", e); | ||
| } | ||
| } | ||
| } |
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