Added JDBCTap support.

1 files changed, 118 insertions, 0 deletions

diff --git a/src/main/java/parallelai/spyglass/jdbc/JDBCTapCollector.java b/src/main/java/parallelai/spyglass/jdbc/JDBCTapCollector.java
new file mode 100644
index 0000000..e8b7deb
--- /dev/null
+++ b/src/main/java/parallelai/spyglass/jdbc/JDBCTapCollector.java
@@ -0,0 +1,118 @@
+/**
+ * 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 parallelai.spyglass.jdbc;
+
+import cascading.flow.FlowProcess;
+import cascading.flow.hadoop.HadoopFlowProcess;
+import cascading.tap.Tap;
+import cascading.tap.TapException;
+import cascading.tuple.TupleEntrySchemeCollector;
+import org.apache.hadoop.mapred.*;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+
+/**
+ * Class JDBCTapCollector is a kind of {@link cascading.tuple.TupleEntrySchemeCollector} that writes tuples to the resource managed by
+ * a particular {@link JDBCTap} instance.
+ */
+public class JDBCTapCollector extends TupleEntrySchemeCollector implements OutputCollector
+{
+    /** Field LOG */
+    private static final Logger LOG = LoggerFactory.getLogger( JDBCTapCollector.class );
+
+    /** Field conf */
+    private final JobConf conf;
+    /** Field writer */
+    private RecordWriter writer;
+    /** Field flowProcess */
+    private final FlowProcess<JobConf> hadoopFlowProcess;
+    /** Field tap */
+    private final Tap<JobConf, RecordReader, OutputCollector> tap;
+    /** Field reporter */
+    private final Reporter reporter = Reporter.NULL;
+
+    /**
+     * Constructor TapCollector creates a new TapCollector instance.
+     *
+     * @param flowProcess
+     * @param tap               of type Tap
+     * @throws IOException when fails to initialize
+     */
+    public JDBCTapCollector( FlowProcess<JobConf> flowProcess, Tap<JobConf, RecordReader, OutputCollector> tap ) throws IOException {
+        super( flowProcess, tap.getScheme() );
+        this.hadoopFlowProcess = flowProcess;
+
+        this.tap = tap;
+        this.conf = new JobConf( flowProcess.getConfigCopy() );
+
+        this.setOutput( this );
+    }
+
+    @Override
+    public void prepare() {
+        try {
+            initialize();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+
+        super.prepare();
+    }
+
+    private void initialize() throws IOException {
+        tap.sinkConfInit( hadoopFlowProcess, conf );
+
+        OutputFormat outputFormat = conf.getOutputFormat();
+
+        LOG.info("Output format class is: " + outputFormat.getClass().toString());
+
+        writer = outputFormat.getRecordWriter( null, conf, tap.getIdentifier(), Reporter.NULL );
+
+        sinkCall.setOutput( this );
+    }
+
+    @Override
+    public void close() {
+        try {
+            LOG.info( "closing tap collector for: {}", tap );
+            writer.close( reporter );
+        } catch( IOException exception ) {
+            LOG.warn( "exception closing: {}", exception );
+            throw new TapException( "exception closing JDBCTapCollector", exception );
+        } finally {
+            super.close();
+        }
+    }
+
+    /**
+     * Method collect writes the given values to the {@link Tap} this instance encapsulates.
+     *
+     * @param writableComparable of type WritableComparable
+     * @param writable           of type Writable
+     * @throws IOException when
+     */
+    public void collect( Object writableComparable, Object writable ) throws IOException {
+        if (hadoopFlowProcess instanceof HadoopFlowProcess)
+            ((HadoopFlowProcess) hadoopFlowProcess).getReporter().progress();
+
+        writer.write( writableComparable, writable );
+    }
+}