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MongoDB implementation of the CrNiCKL database
/*
* Copyright 2012-2013 Hauser Olsson GmbH
*
* 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 ch.agent.crnickl.mongodb;
import java.util.HashMap;
import org.bson.types.ObjectId;
import ch.agent.crnickl.T2DBException;
import ch.agent.crnickl.T2DBMsg;
import ch.agent.crnickl.T2DBMsg.E;
import ch.agent.crnickl.api.AttributeDefinition;
import ch.agent.crnickl.api.Chronicle;
import ch.agent.crnickl.api.DBObjectId;
import ch.agent.crnickl.api.Database;
import ch.agent.crnickl.api.Schema;
import ch.agent.crnickl.api.Series;
import ch.agent.crnickl.api.Surrogate;
import ch.agent.crnickl.api.UpdatableChronicle;
import ch.agent.crnickl.api.UpdatableSeries;
import ch.agent.crnickl.impl.ChronicleUpdatePolicy;
import ch.agent.crnickl.impl.Permission;
import com.mongodb.BasicDBObject;
import com.mongodb.WriteConcern;
/**
* A stateless object with methods providing write access to chronicles and
* series.
* To keep things as simple as possible in a first version,
* chronicles and series values are stored separately, as in relational
* implementations. Changing this would require a non-negligible part of the
* implementation.
*
*/
public class WriteMethodsForChroniclesAndSeries extends ReadMethodsForChroniclesAndSeries {
public WriteMethodsForChroniclesAndSeries() {
}
/**
* Create a chronicle in the database.
* Throw an exception if the operation cannot be done.
*
* @param chronicle a chronicle
* @throws T2DBException
*/
public void createChronicle(Chronicle chronicle) throws T2DBException {
createChronicle(chronicle, false);
}
private void createChronicle(Chronicle chronicle, boolean undoDelete) throws T2DBException {
Surrogate surrogate = null;
Throwable cause = null;
try {
String name = chronicle.getName(false);
chronicle.getSurrogate().getDatabase().getNamingPolicy().checkSimpleName(name, false); // defensive
String description = chronicle.getDescription(false);
if (description == null)
description = "";
Chronicle collection = chronicle.getCollection();
Schema schema = chronicle.getSchema(false);
if (collection != null) {
check(Permission.MODIFY, collection);
if (schema != null && schema.equals(collection.getSchema(true)))
schema = null; // don't repeat yourself
}
if (schema != null)
check(Permission.READ, schema);
DBObjectId ox = insert(chronicle);
surrogate = makeSurrogate(chronicle, ox);
} catch (Exception e) {
cause = e;
} finally {
}
if (surrogate == null || cause != null)
throw T2DBMsg.exception(cause, E.E40109, chronicle.getName(true));
if (!undoDelete)
chronicle.getSurrogate().upgrade(surrogate);
}
/**
* Delete a chronicle from the database. Also delete its attribute values
* and possibly other dependent objects. The chronicle update policy is
* supposed to forbid deleting when there are dependent chronicles or
* series, but to allow cascading delete of attribute values. Throw an
* exception if the operation cannot be done.
*
* @param chronicle a chronicle
* @param policy a chronicle updating policy
* @throws T2DBException
*/
public void deleteChronicle(UpdatableChronicle chronicle, ChronicleUpdatePolicy policy) throws T2DBException {
boolean done = false;
Throwable cause = null;
Surrogate s = chronicle.getSurrogate();
MongoDatabase db = (MongoDatabase) s.getDatabase();
try {
check(Permission.MODIFY, chronicle);
policy.willDelete(chronicle);
Chronicle original = getChronicle(s);
getMongoDB(s).getChronicles().remove(asQuery(s.getId()), WriteConcern.SAFE);
db.sleep();
try {
policy.willDelete(chronicle);
} catch (T2DBException e) {
// Oops! referential integrity broken!
createChronicle(original, true);
throw e;
}
deleteAttributes(chronicle);
done = true;
} catch (Exception e) {
cause = e;
} finally {
}
if (!done || cause != null) {
throw T2DBMsg.exception(cause, E.E40110, chronicle.getName(true));
}
}
/**
* Update a chronicle. Currently only name and description can be updated.
* The schema and the parent chronicle cannot be updated. Throw an exception
* if the operation cannot be done.
*
* @param chronicle
* a chronicle
* @param policy
* a chronicle updating policy
* @throws T2DBException
*/
public void updateChronicle(UpdatableChronicle chronicle, ChronicleUpdatePolicy policy) throws T2DBException {
String name = chronicle.getName(false);
String description = chronicle.getDescription(false);
if (description == null)
description = "";
try {
check(Permission.MODIFY, chronicle);
policy.willUpdate(chronicle);
getMongoDB(chronicle.getSurrogate()).getChronicles().update(
mongoObject(MongoDatabase.FLD_ID, getId(chronicle)),
mongoObject(
MongoDatabase.FLD_CHRON_NAME, name,
MongoDatabase.FLD_CHRON_DESC, description),
true, false);
} catch (Exception e) {
throw T2DBMsg.exception(E.E40111, chronicle.getName(true));
}
}
/**
* Update a chronicle attribute.
* Throw an exception if the operation cannot be done.
*
* @param chronicle a chronicle
* @param def an attribute definition
* @param value a value
* @param description a string
* @throws T2DBException
*/
public void updateAttribute(UpdatableChronicle chronicle, AttributeDefinition def, String value, String description) throws T2DBException {
try {
check(Permission.MODIFY, chronicle);
getMongoDB(chronicle.getSurrogate()).getAttributes().update(
mongoObject(MongoDatabase.FLD_ATTR_CHRON, getId(chronicle),
MongoDatabase.FLD_ATTR_PROP, getId(def.getProperty())),
mongoObject(
MongoDatabase.FLD_ATTR_CHRON, getId(chronicle),
MongoDatabase.FLD_ATTR_PROP, getId(def.getProperty()),
MongoDatabase.FLD_ATTR_VALUE, value,
MongoDatabase.FLD_ATTR_DESC, description),
true, false);
} catch (Exception e) {
throw T2DBMsg.exception(E.E40112, chronicle.getName(true), def.getNumber());
}
}
/**
* Delete an attribute value from a chronicle.
* Throw an exception if the operation cannot be done.
*
* @param chronicle a chronicle
* @param def an attribute definition
* @throws T2DBException
*/
public void deleteAttribute(Chronicle chronicle, AttributeDefinition def) throws T2DBException {
try {
check(Permission.MODIFY, chronicle);
getMongoDB(chronicle.getSurrogate()).getAttributes().remove(
mongoObject(MongoDatabase.FLD_ATTR_CHRON, getId(chronicle),
MongoDatabase.FLD_ATTR_PROP, getId(def.getProperty())),
WriteConcern.SAFE);
} catch (Exception e) {
throw T2DBMsg.exception(E.E40114, chronicle.getName(true), def.getNumber());
}
}
/**
* Delete all attribute values of a chronicle.
* Return the list of attributes, in case they need to be recreated.
*
* @param chronicle
* @throws T2DBException
*/
private void deleteAttributes(Chronicle chronicle) throws T2DBException {
Surrogate s = chronicle.getSurrogate();
Database db = s.getDatabase();
try {
getMongoDB(db).getAttributes().remove(
mongoObject(MongoDatabase.FLD_ATTR_CHRON,getId(s)));
} catch (Exception e) {
throw T2DBMsg.exception(e, E.E40124, chronicle.getName(true));
}
}
/**
* Create an empty series. Throw an exception if the operation cannot be
* done.
*
* @param series
* a series
* @throws T2DBException
*/
public void createSeries(Series series) throws T2DBException {
createSeries(series, false);
}
private void createSeries(Series series, boolean undoDelete) throws T2DBException {
Surrogate surrogate = null;
Throwable cause = null;
try {
check(Permission.MODIFY, series.getChronicle());
DBObjectId ox = insert(series);
surrogate = makeSurrogate(series, ox);
} catch (Exception e) {
cause = e;
} finally {
}
if (surrogate == null || cause != null)
throw T2DBMsg.exception(cause, E.E50111, series.getName(true));
if (!undoDelete)
series.getSurrogate().upgrade(surrogate);
}
/**
* Delete a series. The policy typically forbids to delete a series which is
* not empty. Throw an exception if the operation cannot be done.
*
* @param series
* a series
* @param policy
* a chronicle update policy
* @throws T2DBException
*/
public void deleteSeries(UpdatableSeries series, ChronicleUpdatePolicy policy) throws T2DBException {
boolean done = false;
Throwable cause = null;
Surrogate s = series.getSurrogate();
MongoDatabase db = (MongoDatabase) s.getDatabase();
try {
check(Permission.MODIFY, series);
policy.willDelete(series);
done = policy.deleteSeries(series);
Series original = db.getReadMethodsForChronicleAndSeries().getSeries(s);
getMongoDB(db).getSeries().remove(asQuery(s.getId()), WriteConcern.SAFE);
db.sleep();
try {
policy.willDelete(series);
} catch (T2DBException e) {
// Oops! referential integrity broken!
createSeries(original, true);
throw e;
}
done = true;
} catch (Exception e) {
cause = e;
}
if (!done || cause != null)
throw T2DBMsg.exception(cause, E.E50112, series.getName(true));
}
private DBObjectId insert(Chronicle chronicle) throws T2DBException {
com.mongodb.BasicDBObject bo = new BasicDBObject();
Surrogate s = chronicle.getSurrogate();
if (!s.inConstruction())
bo.put(MongoDatabase.FLD_ID, getId(chronicle)); // use case: re-creating
bo.put(MongoDatabase.FLD_CHRON_NAME, chronicle.getName(false));
bo.put(MongoDatabase.FLD_CHRON_DESC, chronicle.getDescription(false));
bo.put(MongoDatabase.FLD_CHRON_PARENT, getIdOrZero(chronicle.getCollection()));
bo.put(MongoDatabase.FLD_CHRON_SCHEMA, getIdOrZero(chronicle.getSchema(false)));
getMongoDB(s).getChronicles().insert(bo);
ObjectId ox = getObjectId(bo);
return new MongoDBObjectId(ox);
}
private DBObjectId insert(Series series) throws T2DBException {
com.mongodb.BasicDBObject bo = new BasicDBObject();
Surrogate s = series.getSurrogate();
if (!s.inConstruction())
bo.put(MongoDatabase.FLD_ID, getId(series)); // use case: re-creating
bo.put(MongoDatabase.FLD_SER_CHRON, getIdOrZero(series.getChronicle()));
bo.put(MongoDatabase.FLD_SER_NUM, series.getNumber());
bo.put(MongoDatabase.FLD_SER_FIRST, 1);
bo.put(MongoDatabase.FLD_SER_LAST, 0);
bo.put(MongoDatabase.FLD_SER_VALUES, new HashMap());
getMongoDB(s).getSeries().insert(bo);
ObjectId ox = getObjectId(bo);
return new MongoDBObjectId(ox);
}
}
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