/*
* Copyright © 2014 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.internal.app.deploy.pipeline;
import co.cask.cdap.app.ApplicationSpecification;
import co.cask.cdap.data.dataset.DatasetCreationSpec;
import co.cask.cdap.data2.dataset2.DatasetFramework;
import co.cask.cdap.data2.dataset2.InstanceConflictException;
import co.cask.cdap.pipeline.AbstractStage;
import com.google.common.reflect.TypeToken;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Map;
/**
* This {@link co.cask.cdap.pipeline.Stage} is responsible for automatic
* deploy of the {@link co.cask.cdap.api.dataset.module.DatasetModule}s specified by application.
*/
public class CreateDatasetInstancesStage extends AbstractStage<ApplicationSpecLocation> {
private static final Logger LOG = LoggerFactory.getLogger(CreateDatasetInstancesStage.class);
private final DatasetFramework datasetFramework;
public CreateDatasetInstancesStage(DatasetFramework datasetFramework) {
super(TypeToken.of(ApplicationSpecLocation.class));
this.datasetFramework = datasetFramework;
}
/**
* Receives an input containing application specification and location
* and verifies both.
*
* @param input An instance of {@link ApplicationSpecLocation}
*/
@Override
public void process(ApplicationSpecLocation input) throws Exception {
// create dataset instances
ApplicationSpecification specification = input.getSpecification();
for (Map.Entry<String, DatasetCreationSpec> instanceEntry : specification.getDatasets().entrySet()) {
String instanceName = instanceEntry.getKey();
DatasetCreationSpec instanceSpec = instanceEntry.getValue();
try {
if (!datasetFramework.hasInstance(instanceName)) {
datasetFramework.addInstance(instanceSpec.getTypeName(), instanceName, instanceSpec.getProperties());
}
} catch (InstanceConflictException e) {
// NO-OP: Instance is simply already created, possibly by an older version of this app OR a different app
// TODO: verify that the created instance is from this app
LOG.warn("Couldn't create dataset instance '" + instanceName + "' of type '" + instanceSpec.getTypeName(), e);
}
}
// Emit the input to next stage.
emit(input);
}
}