/*
* Copyright © 2015 Cask Data, Inc.
*
* 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 co.cask.cdap.explore.service.datasets;
import co.cask.cdap.api.common.Bytes;
import co.cask.cdap.api.data.batch.RecordScannable;
import co.cask.cdap.api.data.batch.RecordScanner;
import co.cask.cdap.api.data.batch.Split;
import co.cask.cdap.api.data.format.StructuredRecord;
import co.cask.cdap.api.data.schema.Schema;
import co.cask.cdap.api.dataset.DatasetAdmin;
import co.cask.cdap.api.dataset.DatasetContext;
import co.cask.cdap.api.dataset.DatasetDefinition;
import co.cask.cdap.api.dataset.DatasetProperties;
import co.cask.cdap.api.dataset.DatasetSpecification;
import co.cask.cdap.api.dataset.lib.AbstractDataset;
import co.cask.cdap.api.dataset.lib.AbstractDatasetDefinition;
import co.cask.cdap.api.dataset.module.DatasetDefinitionRegistry;
import co.cask.cdap.api.dataset.module.DatasetModule;
import co.cask.cdap.api.dataset.table.Put;
import co.cask.cdap.api.dataset.table.Table;
import java.io.IOException;
import java.lang.reflect.Type;
import java.util.List;
import java.util.Map;
/**
* Dataset definition with a record scannable table, containing an extensive schema. Used for testing.
*/
public class EmailTableDefinition extends AbstractDatasetDefinition<EmailTableDefinition.EmailTable, DatasetAdmin> {
public static final Schema SCHEMA = Schema.recordOf("email",
Schema.Field.of("id", Schema.of(Schema.Type.STRING)),
Schema.Field.of("subject", Schema.of(Schema.Type.STRING)),
Schema.Field.of("body", Schema.of(Schema.Type.STRING)),
Schema.Field.of("sender", Schema.of(Schema.Type.STRING))
);
private final DatasetDefinition<? extends Table, ?> tableDef;
public EmailTableDefinition(String name, DatasetDefinition<? extends Table, ?> orderedTableDefinition) {
super(name);
this.tableDef = orderedTableDefinition;
}
@Override
public DatasetSpecification configure(String instanceName, DatasetProperties properties) {
DatasetProperties propertiesWithSchema = DatasetProperties.builder()
.addAll(properties.getProperties())
.add(DatasetProperties.SCHEMA, SCHEMA.toString())
.add(Table.PROPERTY_SCHEMA_ROW_FIELD, "id")
.build();
return DatasetSpecification.builder(instanceName, getName())
.properties(propertiesWithSchema.getProperties())
.datasets(tableDef.configure("email-table", propertiesWithSchema))
.build();
}
@Override
public DatasetAdmin getAdmin(DatasetContext datasetContext, DatasetSpecification spec,
ClassLoader classLoader) throws IOException {
return tableDef.getAdmin(datasetContext, spec.getSpecification("email-table"), classLoader);
}
@Override
public EmailTable getDataset(DatasetContext datasetContext, DatasetSpecification spec,
Map<String, String> arguments, ClassLoader classLoader) throws IOException {
Table table = tableDef.getDataset(datasetContext, spec.getSpecification("email-table"), arguments,
classLoader);
return new EmailTable(spec.getName(), table);
}
/**
* Table that writes emails.
*/
public static class EmailTable extends AbstractDataset implements RecordScannable<StructuredRecord> {
private final Table table;
public EmailTable(String instanceName, Table table) {
super(instanceName, table);
this.table = table;
}
public void writeEmail(String id, String subject, String body, String sender) {
Put put = new Put(Bytes.toBytes(id));
put.add("subject", subject);
put.add("body", body);
put.add("sender", sender);
table.put(put);
}
@Override
public Type getRecordType() {
return StructuredRecord.class;
}
@Override
public List<Split> getSplits() {
return table.getSplits();
}
@Override
public RecordScanner<StructuredRecord> createSplitRecordScanner(Split split) {
return table.createSplitRecordScanner(split);
}
}
/**
* EmailTable Module
*/
public static class EmailTableModule implements DatasetModule {
@Override
public void register(DatasetDefinitionRegistry registry) {
DatasetDefinition<Table, DatasetAdmin> table = registry.get("table");
EmailTableDefinition emailTable = new EmailTableDefinition("email", table);
registry.add(emailTable);
}
}
}