/**
*
*/
package com.thinkbiganalytics.metadata.core.dataset;
/*-
* #%L
* thinkbig-metadata-core
* %%
* Copyright (C) 2017 ThinkBig Analytics
* %%
* 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.
* #L%
*/
import com.google.common.base.Predicate;
import com.google.common.collect.Iterators;
import com.google.common.collect.Lists;
import com.thinkbiganalytics.metadata.api.MetadataException;
import com.thinkbiganalytics.metadata.api.datasource.Datasource;
import com.thinkbiganalytics.metadata.api.datasource.Datasource.ID;
import com.thinkbiganalytics.metadata.api.datasource.DatasourceCriteria;
import com.thinkbiganalytics.metadata.api.datasource.DatasourceDetails;
import com.thinkbiganalytics.metadata.api.datasource.DatasourceProvider;
import com.thinkbiganalytics.metadata.api.datasource.DerivedDatasource;
import com.thinkbiganalytics.metadata.core.AbstractMetadataCriteria;
import org.apache.commons.lang3.reflect.ConstructorUtils;
import org.joda.time.DateTime;
import java.io.Serializable;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;
import javax.annotation.Nonnull;
/**
*
*/
public class InMemoryDatasourceProvider implements DatasourceProvider {
private Map<Datasource.ID, Datasource> datasets = new ConcurrentHashMap<>();
public DatasourceCriteria datasetCriteria() {
return new DatasetCriteriaImpl();
}
@Override
public ID resolve(Serializable id) {
if (id instanceof BaseDatasource.DatasourceId) {
return (BaseDatasource.DatasourceId) id;
} else {
return new BaseDatasource.DatasourceId(id);
}
}
@Override
public DerivedDatasource ensureDerivedDatasource(String datasourceType, String identityString, String title, String desc, Map<String, Object> properties) {
return null;
}
@Override
public DerivedDatasource findDerivedDatasource(String datasourceType, String systemName) {
return null;
}
@Override
public <D extends Datasource> D ensureDatasource(String name, String descr, Class<D> type) {
synchronized (this.datasets) {
try {
D ds = null;
BaseDatasource existing = getExistingDataset(name);
if (existing == null) {
ds = (D) ConstructorUtils.invokeConstructor(type, name, descr);
this.datasets.put(ds.getId(), ds);
} else if (type.isInstance(ds)) {
ds = (D) existing;
} else {
throw new MetadataException("A datasource already exists of type: " + ds.getClass() + " but expected one of type: " + type);
}
return ds;
} catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException | InstantiationException e) {
throw new MetadataException("Failed to create a datasource to type: " + type, e);
}
}
}
@Override
public DerivedDatasource ensureGenericDatasource(String name, String descr) {
return null;
}
//
// @Override
public Datasource ensureDatasource(String name, String descr) {
synchronized (this.datasets) {
BaseDatasource ds = getExistingDataset(name);
if (ds == null) {
ds = new BaseDatasource(name, descr);
this.datasets.put(ds.getId(), ds);
}
return ds;
}
}
@Override
public void removeDatasource(ID id) {
}
//
//
// @Override
// public DirectoryDatasource asDirectoryDatasource(ID dsId, Path dir) {
// synchronized (this.datasets) {
// BaseDatasource ds = (BaseDatasource) this.datasets.get(dsId);
//
// if (ds != null) {
// BaseDirectoryDatasource dds = new BaseDirectoryDatasource(ds, dir);
// this.datasets.put(dds.getId(), dds);
// return dds;
// } else {
// throw new DatasourceException("A no dataset exists with the given ID: " + dsId);
// }
// }
// }
//
// @Override
// public HiveTableDatasource asHiveTableDatasource(ID dsId, String database, String table) {
// synchronized (this.datasets) {
// BaseDatasource ds = (BaseDatasource) this.datasets.get(dsId);
//
// if (ds != null) {
// BaseHiveTableDatasource hds = new BaseHiveTableDatasource(ds, database, table);
// this.datasets.put(hds.getId(), hds);
// return hds;
// } else {
// throw new DatasourceException("A no dataset exists with the given ID: " + dsId);
// }
// }
// }
@Override
public Datasource getDatasource(ID id) {
return this.datasets.get(id);
}
@Override
public List<Datasource> getDatasources() {
return new ArrayList<Datasource>(this.datasets.values());
}
@Override
public List<Datasource> getDatasources(DatasourceCriteria criteria) {
// TODO replace cast with copy method
DatasetCriteriaImpl critImpl = (DatasetCriteriaImpl) criteria;
Iterator<Datasource> filtered = Iterators.filter(this.datasets.values().iterator(), critImpl);
Iterator<Datasource> limited = Iterators.limit(filtered, critImpl.getLimit());
List<Datasource> list = Lists.newArrayList(limited);
Collections.sort(list, critImpl);
return list;
}
@Override
public <D extends DatasourceDetails> Optional<D> ensureDatasourceDetails(@Nonnull ID id, @Nonnull Class<D> type) {
return null;
}
private BaseDatasource getExistingDataset(String name) {
synchronized (this.datasets) {
for (Datasource ds : this.datasets.values()) {
if (ds.getName().equals(name)) {
return (BaseDatasource) ds;
}
}
return null;
}
}
private static class DatasetCriteriaImpl extends AbstractMetadataCriteria<DatasourceCriteria>
implements DatasourceCriteria, Predicate<Datasource>, Comparator<Datasource> {
private String name;
private DateTime createdOn;
private DateTime createdAfter;
private DateTime createdBefore;
private Class<? extends Datasource> type;
@Override
public boolean apply(Datasource input) {
if (this.type != null && !this.type.isAssignableFrom(input.getClass())) {
return false;
}
if (this.name != null && !name.equals(input.getName())) {
return false;
}
if (this.createdOn != null && !this.createdOn.equals(input.getCreatedTime())) {
return false;
}
if (this.createdAfter != null && !this.createdAfter.isBefore(input.getCreatedTime())) {
return false;
}
if (this.createdBefore != null && !this.createdBefore.isBefore(input.getCreatedTime())) {
return false;
}
return true;
}
@Override
public int compare(Datasource o1, Datasource o2) {
return o2.getCreatedTime().compareTo(o1.getCreatedTime());
}
@Override
public DatasourceCriteria name(String name) {
this.name = name;
return this;
}
@Override
public DatasourceCriteria createdOn(DateTime time) {
this.createdOn = time;
return this;
}
@Override
public DatasourceCriteria createdAfter(DateTime time) {
this.createdAfter = time;
return this;
}
@Override
public DatasourceCriteria createdBefore(DateTime time) {
this.createdBefore = time;
return this;
}
@Override
public DatasourceCriteria type(Class<? extends Datasource> type) {
this.type = type;
return this;
}
}
}