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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.Collection;
import java.util.List;
import java.util.Random;
import ch.agent.crnickl.T2DBException;
import ch.agent.crnickl.T2DBMsg;
import ch.agent.crnickl.T2DBMsg.D;
import ch.agent.crnickl.T2DBMsg.E;
import ch.agent.crnickl.api.Attribute;
import ch.agent.crnickl.api.AttributeDefinition;
import ch.agent.crnickl.api.Chronicle;
import ch.agent.crnickl.api.DBObjectId;
import ch.agent.crnickl.api.DBObjectType;
import ch.agent.crnickl.api.DatabaseConfiguration;
import ch.agent.crnickl.api.Property;
import ch.agent.crnickl.api.Schema;
import ch.agent.crnickl.api.Series;
import ch.agent.crnickl.api.SeriesDefinition;
import ch.agent.crnickl.api.Surrogate;
import ch.agent.crnickl.api.UpdatableChronicle;
import ch.agent.crnickl.api.UpdatableProperty;
import ch.agent.crnickl.api.UpdatableSchema;
import ch.agent.crnickl.api.UpdatableSeries;
import ch.agent.crnickl.api.UpdatableValueType;
import ch.agent.crnickl.api.UpdateEventOperation;
import ch.agent.crnickl.api.ValueType;
import ch.agent.crnickl.impl.DatabaseBackend;
import ch.agent.crnickl.impl.DatabaseBackendImpl;
import ch.agent.crnickl.impl.SchemaUpdatePolicy;
import ch.agent.crnickl.impl.UpdateEventImpl;
import ch.agent.crnickl.impl.UpdateEventPublisherImpl;
/**
* A JDBC implementation of {@link DatabaseBackendImpl}.
*
* @author Jean-Paul Vetterli
*/
public class MongoDatabase extends DatabaseBackendImpl {
public static final String FLD_ID = "_id";
public static final String COLL_CHRON = "CHRON";
public static final String FLD_CHRON_NAME = "name";
public static final String FLD_CHRON_DESC = "desc";
public static final String FLD_CHRON_PARENT = "parent";
public static final String FLD_CHRON_SCHEMA = "schema";
public static final String COLL_SER = "SER";
public static final String FLD_SER_CHRON = "chron";
public static final String FLD_SER_NUM = "number";
public static final String FLD_SER_FIRST = "first";
public static final String FLD_SER_LAST = "last";
public static final String FLD_SER_VALUES = "values";
public static final String COLL_ATTR = "ATTR";
public static final String FLD_ATTR_CHRON = "chron";
public static final String FLD_ATTR_PROP = "prop";
public static final String FLD_ATTR_VALUE = "val";
public static final String FLD_ATTR_DESC = "descr";
public static final String COLL_PROP = "PROP";
public static final String FLD_PROP_NAME = "name";
public static final String FLD_PROP_VT = "type";
public static final String FLD_PROP_INDEXED = "indexed";
public static final String COLL_SCHEMA = "SCH";
public static final String FLD_SCHEMA_NAME = "name";
public static final String FLD_SCHEMA_BASE = "base";
public static final String FLD_SCHEMA_ATTRIBS = "attribs";
public static final String FLD_SCHEMA_SERIES = "series";
public static final String FLD_ATTRIBDEF_NUM = "num";
public static final String FLD_ATTRIBDEF_PROP = "prop";
public static final String FLD_ATTRIBDEF_VAL = "val";
public static final String FLD_ATTRIBDEF_ERASING = "erasing";
public static final String FLD_SERIESDEF_NUM = "num";
public static final String FLD_SERIESDEF_DESC = "desc";
public static final String FLD_SERIESDEF_ATTRIBS = "attribs";
public static final String FLD_SERIESDEF_ERASING = "erasing";
public static final String COLL_VT = "VT";
public static final String FLD_VT_NAME = "name";
public static final String FLD_VT_TYPE = "type";
public static final String FLD_VT_VALUES = "values";
/**
* The name of the external parameter specifying the waiting delay range
* for dangerous updates. The parameter value is a range of milliseconds
* specified with two numbers separated by a hyphen. The default range is
* {@link #DB_PARAM_IntInt_WAITING_DELAY_RANGE_DEFAULT}.
*/
public static final String DB_PARAM_IntInt_WAITING_DELAY_RANGE = "dbWaitingDelayRange";
public static final String DB_PARAM_IntInt_WAITING_DELAY_RANGE_DEFAULT = "3000-6000";
/*
* TODO: investigate pulling interfaces and some for ReadMethodsForFoo and
* WriteMethodsForBar into the "impl" layer. Is the separation in read and
* write methods still meaningful? Why not simply "access methods"?
*/
private ReadMethodsForChroniclesAndSeries esRMethods;
private WriteMethodsForChroniclesAndSeries esWMethods;
private ReadMethodsForValueType vtRMethods;
private WriteMethodsForValueType vtWMethods;
private ReadMethodsForProperty pRMethods;
private WriteMethodsForProperty pWMethods;
private ReadMethodsForSchema sRMethods;
private WriteMethodsForSchema sWMethods;
private MongoDB mongoDB;
private MongoDBSchemaUpdatePolicy msup;
private static Random random;
private int minDelay = 3000;
private int maxDelay = 6000;
/**
* Construct a {@link DatabaseBackend}.
*
* @param name the name of the database
*/
public MongoDatabase(String name) {
super(name);
}
@Override
protected boolean isChronicleUpdatePolicyExtensionAllowed() {
/*
* Completely impossible to undo work without rollback,
* so just forbid extensions.
*/
return false;
}
@Override
public void configure(DatabaseConfiguration configuration) throws T2DBException {
super.configure(configuration);
new MongoDB(this, configuration);
setAccessMethods(ValueType.StandardValueType.NUMBER.name(), new AccessMethodsForNumber());
String parameter = configuration.getParameter(DB_PARAM_IntInt_WAITING_DELAY_RANGE, false);
if (parameter == null)
parameter = DB_PARAM_IntInt_WAITING_DELAY_RANGE_DEFAULT;
try {
String[] bounds = parameter.split("-");
switch(bounds.length) {
case 1:
minDelay = new Integer(bounds[0]);
maxDelay = minDelay;
break;
case 2:
minDelay = new Integer(bounds[0]);
maxDelay = new Integer(bounds[1]);
break;
default:
throw new IllegalArgumentException("min[-max] ?");
}
if (minDelay > maxDelay)
throw new IllegalArgumentException("min<=max ?");
} catch (Exception e) {
throw T2DBMsg.exception(e, D.D00108, DB_PARAM_IntInt_WAITING_DELAY_RANGE, parameter);
}
}
@Override
public SchemaUpdatePolicy getSchemaUpdatePolicy() {
if (msup == null)
msup = new MongoDBSchemaUpdatePolicy(this);
return msup;
}
@Override
public DBObjectId makeDBObjectId(Object object) throws T2DBException {
return new MongoDBObjectId(object);
}
public MongoDB getMongoDB() {
if (mongoDB == null)
mongoDB = MongoDB.getInstance();
return mongoDB;
}
/**
* Sleep a number of milliseconds before trying to detect violations of
* referential integrity. Return true if there was no
* {@link InterruptedException} else return false. This is a random number
* in the range specified with the the
* {@link #DB_PARAM_IntInt_WAITING_DELAY_RANGE} configuration parameter.
*
* A update is said to be dangerous when there is a risk of leaving the
* database in a inconsistent state. The underlying cause is lack of support
* for transactions or referential integrity. Example a.b == b._id and b is
* deleted. The following pseudo code shows how dangerous updates are
* performed.
*
*
*
* count references of document
* if (count > 0)
* fail
* memo := get prior state of document to be updated
* update document
* sleep()
* count references again
* if (count > 0)
* do
* restore document to its prior state using memo
* fail
* done
*
*
*
*
* @throws InterruptedException
*/
public void sleep() throws InterruptedException {
int delay = maxDelay - minDelay;
if (delay > 0 && random == null)
random = new Random();
int millis = minDelay + (delay > 0 ? random.nextInt(maxDelay - minDelay) : 0);
Thread.sleep(millis);
}
/*** manage back end store ***/
@Override
public void commit() throws T2DBException {
((UpdateEventPublisherImpl)getUpdateEventPublisher()).release();
}
@Override
public void rollback() throws T2DBException {
// ignore silently
}
/*** Chronicle and Series ***/
/**
* Return the object providing read methods for chronicles and series.
*
* @return the object providing read methods for chronicles and series
*/
protected ReadMethodsForChroniclesAndSeries getReadMethodsForChronicleAndSeries() {
if (esRMethods == null)
esRMethods = new ReadMethodsForChroniclesAndSeries();
return esRMethods;
}
/**
* Return the object providing write methods for chronicles and series.
*
* @return the object providing write methods for chronicles and series
*/
protected WriteMethodsForChroniclesAndSeries getWriteMethodsForChroniclesAndSeries() {
if (esWMethods == null)
esWMethods = new WriteMethodsForChroniclesAndSeries();
return esWMethods;
}
@Override
public void create(UpdatableChronicle entity) throws T2DBException {
getWriteMethodsForChroniclesAndSeries().createChronicle(entity);
publish(new UpdateEventImpl(UpdateEventOperation.CREATE, entity).withComment(entity.getDescription(false)));
}
@Override
public void update(UpdatableChronicle entity) throws T2DBException {
getWriteMethodsForChroniclesAndSeries().updateChronicle(entity, getChronicleUpdatePolicy());
publish(new UpdateEventImpl(UpdateEventOperation.MODIFY, entity));
}
@Override
public void deleteAttributeValue(UpdatableChronicle entity, AttributeDefinition def) throws T2DBException {
getWriteMethodsForChroniclesAndSeries().deleteAttribute(entity, def);
publish(new UpdateEventImpl(UpdateEventOperation.MODIFY, entity).withComment("delete attribute #" + def.getNumber()));
}
@Override
public void update(UpdatableChronicle entity, AttributeDefinition def, String value, String description) throws T2DBException {
getWriteMethodsForChroniclesAndSeries().updateAttribute(entity, def, value, description);
publish(new UpdateEventImpl(UpdateEventOperation.MODIFY, entity).withComment(String.format("%s=%s", def.getProperty().getName(), value)));
}
@Override
public void deleteChronicle(UpdatableChronicle entity) throws T2DBException {
getWriteMethodsForChroniclesAndSeries().deleteChronicle(entity, getChronicleUpdatePolicy());
// pass name and description as comment, because they are lost when logger gets them
String comment = getNamingPolicy().joinValueAndDescription(entity.getName(true), entity.getDescription(false));
publish(new UpdateEventImpl(UpdateEventOperation.DELETE, entity).withComment(comment));
}
@Override
public void create(UpdatableSeries series) throws T2DBException {
getWriteMethodsForChroniclesAndSeries().createSeries(series);
publish(new UpdateEventImpl(UpdateEventOperation.CREATE, series));
}
@Override
public void deleteSeries(UpdatableSeries series) throws T2DBException {
getWriteMethodsForChroniclesAndSeries().deleteSeries(series, getChronicleUpdatePolicy());
String comment = getNamingPolicy().joinValueAndDescription(series.getName(true), series.getDescription(false));
publish(new UpdateEventImpl(UpdateEventOperation.DELETE, series).withComment(comment));
}
@Override
public Chronicle getChronicle(Chronicle chronicle) throws T2DBException {
return getReadMethodsForChronicleAndSeries().getChronicle(chronicle.getSurrogate());
}
@Override
public Chronicle getChronicleOrNull(Chronicle parent, String simpleName) throws T2DBException {
return getReadMethodsForChronicleAndSeries().getChronicleOrNull(parent, simpleName);
}
@Override
public Collection getChroniclesByParent(Chronicle parent) throws T2DBException {
return getReadMethodsForChronicleAndSeries().getChroniclesByParent(parent);
}
@Override
public List getChroniclesByAttributeValue(Property property, T value, int maxSize) throws T2DBException {
return getReadMethodsForChronicleAndSeries().getChroniclesByAttributeValue(property, value, maxSize);
}
@Override
public boolean getAttributeValue(List chronicles, Attribute attribute) throws T2DBException {
return getReadMethodsForChronicleAndSeries().getAttributeValue(chronicles, attribute);
}
@Override
public Series[] getSeries(Chronicle chronicle, String[] names, int[] numbers) throws T2DBException {
return getReadMethodsForChronicleAndSeries().getSeries(chronicle, names, numbers);
}
@Override
public Series getSeries(Surrogate surrogate) throws T2DBException {
checkSurrogate(surrogate, DBObjectType.SERIES);
Series series = getReadMethodsForChronicleAndSeries().getSeries(surrogate);
if (series == null)
throw T2DBMsg.exception(E.E50104, surrogate.toString());
return series;
}
/*** Property ***/
/**
* Return the object providing read methods for properties.
*
* @return the object providing read methods for properties
*/
protected ReadMethodsForProperty getReadMethodsForProperty() {
if (pRMethods == null)
pRMethods = new ReadMethodsForProperty();
return pRMethods;
}
/**
* Return the object providing write methods for properties.
*
* @return the object providing write methods for properties
*/
protected WriteMethodsForProperty getWriteMethodsForProperty() {
if (pWMethods == null)
pWMethods = new WriteMethodsForProperty();
return pWMethods;
}
@Override
public Collection> getProperties(String pattern) throws T2DBException {
return getReadMethodsForProperty().getProperties(this, pattern);
}
@Override
public Property getProperty(Surrogate surrogate) throws T2DBException {
checkSurrogate(surrogate, DBObjectType.PROPERTY);
Property vt = getReadMethodsForProperty().getProperty(surrogate);
if (vt == null)
throw T2DBMsg.exception(E.E20109, surrogate.toString());
return vt;
}
@Override
public Property getProperty(String name) throws T2DBException {
return getReadMethodsForProperty().getProperty(this, name);
}
@Override
public void create(UpdatableProperty property) throws T2DBException {
getWriteMethodsForProperty().createProperty(property);
publish(new UpdateEventImpl(UpdateEventOperation.CREATE, property));
}
@Override
public void deleteProperty(UpdatableProperty property) throws T2DBException {
getWriteMethodsForProperty().deleteProperty(property, getSchemaUpdatePolicy());
String comment = property.getName();
publish(new UpdateEventImpl(UpdateEventOperation.DELETE, property).withComment(comment));
}
@Override
public void update(UpdatableProperty property) throws T2DBException {
getWriteMethodsForProperty().updateProperty(property, getSchemaUpdatePolicy());
publish(new UpdateEventImpl(UpdateEventOperation.MODIFY, property));
}
/*** ValueType ***/
/**
* Return the object providing read methods for value types.
*
* @return the object providing read methods for value types
*/
protected ReadMethodsForValueType getReadMethodsForValueType() {
if (vtRMethods == null)
vtRMethods = new ReadMethodsForValueType();
return vtRMethods;
}
/**
* Return the object providing write methods for value types.
*
* @return the object providing write methods for value types
*/
protected WriteMethodsForValueType getWriteMethodsForValueType() {
if (vtWMethods == null)
vtWMethods = new WriteMethodsForValueType();
return vtWMethods;
}
@Override
public Collection> getValueTypes(String pattern) throws T2DBException {
return getReadMethodsForValueType().getValueTypes(this, pattern);
}
@Override
public ValueType getValueType(String name) throws T2DBException {
ValueType vt = getReadMethodsForValueType().getValueType(this, name);
if (vt == null)
throw T2DBMsg.exception(E.E10109, name);
return vt;
}
@Override
public ValueType getValueType(Surrogate surrogate) throws T2DBException {
checkSurrogate(surrogate, DBObjectType.VALUE_TYPE);
ValueType vt = getReadMethodsForValueType().getValueType(surrogate);
if (vt == null)
throw T2DBMsg.exception(E.E10110, surrogate.toString());
return vt;
}
@Override
public void create(UpdatableValueType valueType) throws T2DBException {
getWriteMethodsForValueType().createValueType(valueType);
publish(new UpdateEventImpl(UpdateEventOperation.CREATE, valueType));
}
@Override
public void deleteValueType(UpdatableValueType valueType) throws T2DBException {
getWriteMethodsForValueType().deleteValueType(valueType, getSchemaUpdatePolicy());
String comment = valueType.getName();
publish(new UpdateEventImpl(UpdateEventOperation.DELETE, valueType).withComment(comment));
}
@Override
public void update(UpdatableValueType valueType) throws T2DBException {
getWriteMethodsForValueType().updateValueType(valueType, getSchemaUpdatePolicy());
publish(new UpdateEventImpl(UpdateEventOperation.MODIFY, valueType));
}
/*** Schemas ***/
/**
* Return the object providing read methods for schemas.
*
* @return the object providing read methods for schemass
*/
protected ReadMethodsForSchema getReadMethodsForSchema() {
if (sRMethods == null)
sRMethods = new ReadMethodsForSchema();
return sRMethods;
}
/**
* Return the object providing write methods for schemas.
*
* @return the object providing write methods for schemas
*/
protected WriteMethodsForSchema getWriteMethodsForSchema() {
if (sWMethods == null)
sWMethods = new WriteMethodsForSchema();
return sWMethods;
}
@Override
public Collection getSchemaSurrogates(String pattern) throws T2DBException {
return getReadMethodsForSchema().getSchemaSurrogateList(this, pattern);
}
@Override
public UpdatableSchema getUpdatableSchema(Surrogate surrogate) throws T2DBException {
UpdatableSchema schema = getReadMethodsForSchema().getSchema(surrogate);
if (schema == null)
throw T2DBMsg.exception(E.E30109, surrogate.toString());
return schema;
}
@Override
public void create(UpdatableSchema schema) throws T2DBException {
getWriteMethodsForSchema().createSchema(schema);
publish(new UpdateEventImpl(UpdateEventOperation.CREATE, schema));
}
@Override
public void update(UpdatableSchema schema) throws T2DBException {
getWriteMethodsForSchema().updateSchema(schema, getSchemaUpdatePolicy());
((UpdateEventPublisherImpl)getUpdateEventPublisher()).publish(new UpdateEventImpl(UpdateEventOperation.MODIFY, schema), false);
}
@Override
public void deleteSchema(UpdatableSchema schema) throws T2DBException {
getWriteMethodsForSchema().deleteSchema(schema, getSchemaUpdatePolicy());
String comment = schema.getName();
publish(new UpdateEventImpl(UpdateEventOperation.DELETE, schema).withComment(comment));
}
@Override
public Surrogate findChronicle(Schema schema) throws T2DBException {
return getWriteMethodsForSchema().findChronicle(schema);
}
@Override
public Surrogate findChronicle(Property property, Schema schema) throws T2DBException {
return getWriteMethodsForSchema().findChronicle(property, schema);
}
@Override
public Surrogate findChronicle(SeriesDefinition ss, Schema schema) throws T2DBException {
return getWriteMethodsForSchema().findChronicle(ss, schema);
}
@Override
public String toString() {
return MongoDB.getInstance().toString();
}
}
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