/*
* 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.api.dataset.lib;
import co.cask.cdap.api.annotation.Beta;
import co.cask.cdap.api.dataset.DatasetAdmin;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
/**
* Implementation of {@link DatasetAdmin} that propagates administrative operations to the given list of
* {@link co.cask.cdap.api.dataset.DatasetAdmin}s
*/
@Beta
public class CompositeDatasetAdmin implements DatasetAdmin {
private static final Logger LOG = LoggerFactory.getLogger(CompositeDatasetAdmin.class);
private final List<DatasetAdmin> delegates;
/**
* Constructor that takes list of dataset admins
* @param admins list of dataset admins
*/
public CompositeDatasetAdmin(Collection<? extends DatasetAdmin> admins) {
this.delegates = Collections.unmodifiableList(new ArrayList<>(admins));
}
/**
* Constructor that takes list of dataset admins
* @param admins list of dataset admins
*/
public CompositeDatasetAdmin(DatasetAdmin... admins) {
this(Arrays.asList(admins));
}
@Override
public boolean exists() throws IOException {
boolean exists = true;
for (DatasetAdmin admin : delegates) {
exists = exists && admin.exists();
}
return exists;
}
@Override
public void create() throws IOException {
for (DatasetAdmin admin : delegates) {
admin.create();
}
}
@Override
public void drop() throws IOException {
for (DatasetAdmin admin : delegates) {
admin.drop();
}
}
@Override
public void truncate() throws IOException {
for (DatasetAdmin admin : delegates) {
admin.truncate();
}
}
@Override
public void upgrade() throws IOException {
for (DatasetAdmin admin : delegates) {
admin.upgrade();
}
}
@Override
public void close() throws IOException {
for (DatasetAdmin admin : delegates) {
try {
admin.close();
} catch (IOException e) {
LOG.warn("Exception raised when calling close() on {} of type {}", admin, admin.getClass(), e);
}
}
}
}