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Xodus is pure Java transactional schema-less embedded database
/**
* Copyright 2010 - 2018 JetBrains s.r.o.
*
* 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 jetbrains.exodus.query.metadata;
import jetbrains.exodus.core.dataStructures.hash.HashMap;
import jetbrains.exodus.core.dataStructures.hash.HashSet;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
public class ModelMetaDataImpl implements ModelMetaData {
private static final Logger logger = LoggerFactory.getLogger(ModelMetaDataImpl.class);
private static final boolean LOG_RESET = Boolean.getBoolean("jetbrains.exodus.query.metadata.logReset");
private final Set entityMetaDatas = Collections.newSetFromMap(new ConcurrentHashMap());
private final Map associationMetaDatas = new ConcurrentHashMap<>();
private volatile Map typeToEntityMetaDatas = null;
public void init() {
reset();
prepare();
}
public void setEntityMetaDatas(@NotNull Set entityMetaDatas) {
this.entityMetaDatas.clear();
this.entityMetaDatas.addAll(entityMetaDatas);
for (EntityMetaData emd : entityMetaDatas) {
((EntityMetaDataImpl) emd).setModelMetaData(this);
}
}
public void setAssociationMetaDatas(Set associationMetaDatas) {
for (AssociationMetaData amd : associationMetaDatas) {
this.associationMetaDatas.put(((AssociationMetaDataImpl) amd).getFullName(), amd);
}
}
public void addEntityMetaData(@NotNull EntityMetaData emd) {
entityMetaDatas.add(emd);
((EntityMetaDataImpl) emd).setModelMetaData(this);
reset();
}
void reset() {
if (LOG_RESET) {
logger.info("ModelMetaDataImpl#reset() invoked in thread " + Thread.currentThread(), new Throwable());
}
synchronized (entityMetaDatas) {
typeToEntityMetaDatas = null;
}
}
@NotNull
public Map prepare() {
Map result = typeToEntityMetaDatas;
if (result != null) {
return result;
}
synchronized (entityMetaDatas) {
result = typeToEntityMetaDatas;
if (result != null) {
return result;
}
result = new HashMap<>();
for (final EntityMetaData emd : entityMetaDatas) {
((EntityMetaDataImpl) emd).reset();
final String type = emd.getType();
if (result.get(type) != null) {
throw new IllegalArgumentException("Duplicate entity [" + type + ']');
}
result.put(type, emd);
}
this.typeToEntityMetaDatas = result;
for (EntityMetaData emd : entityMetaDatas) {
final EntityMetaDataImpl impl = (EntityMetaDataImpl) emd;
final Set ends = impl.getExternalAssociationEnds();
if (ends != null) {
for (AssociationEndMetaData aemd : ends) {
final AssociationEndMetaDataImpl endImpl = (AssociationEndMetaDataImpl) aemd;
endImpl.resolve(this, associationMetaDatas.get(endImpl.getAssociationMetaDataName()));
}
}
}
for (final EntityMetaData emd : entityMetaDatas) {
Set ends = ((EntityMetaDataImpl) emd).getExternalAssociationEnds();
final boolean wasNull = ends == null;
String superType = emd.getSuperType();
while (superType != null) {
EntityMetaData parent = result.get(superType);
Set parentEnds = ((EntityMetaDataImpl) parent).getExternalAssociationEnds();
if (parentEnds != null) {
if (ends == null) {
ends = new HashSet<>(parentEnds);
} else {
ends.addAll(parentEnds);
}
}
superType = parent.getSuperType();
}
if (wasNull && ends != null) {
// non-null ends are mutated in-place
((EntityMetaDataImpl) emd).setAssociationEnds(ends);
}
}
for (final EntityMetaData emd : entityMetaDatas) {
// add subtype
final String superType = emd.getSuperType();
if (superType != null) {
addSubTypeToMetaData(result, emd, superType);
}
// add interface types
for (String iFaceType : emd.getInterfaceTypes()) {
addSubTypeToMetaData(result, emd, iFaceType);
}
// set supertypes
List thisAndSuperTypes = new ArrayList<>();
EntityMetaData data = emd;
String t = data.getType();
do {
thisAndSuperTypes.add(t);
thisAndSuperTypes.addAll(data.getInterfaceTypes());
data = result.get(t);
t = data.getSuperType();
} while (t != null);
((EntityMetaDataImpl) emd).setThisAndSuperTypes(thisAndSuperTypes);
}
return result;
}
}
private void addSubTypeToMetaData(Map typeToEntityMetaDatas, EntityMetaData emd, String superType) {
final EntityMetaData superEmd = typeToEntityMetaDatas.get(superType);
if (superEmd == null) {
throw new IllegalArgumentException("No entity metadata for super type [" + superType + "]");
}
((EntityMetaDataImpl) superEmd).addSubType(emd.getType());
}
@Override
@Nullable
public EntityMetaData getEntityMetaData(@NotNull String entityType) {
return prepare().get(entityType);
}
@Override
@NotNull
public Iterable getEntitiesMetaData() {
return prepare().values();
}
public boolean hasAssociation(String sourceEntityName, String targetEntityName, String sourceName) {
return associationMetaDatas.containsKey(getUniqueAssociationName(sourceEntityName, targetEntityName, sourceName));
}
@Override
public AssociationMetaData addAssociation(String sourceEntityName, String targetEntityName,
AssociationType type,
String sourceName, AssociationEndCardinality sourceCardinality,
boolean sourceCascadeDelete, boolean sourceClearOnDelete, boolean sourceTargetCascadeDelete, boolean sourceTargetClearOnDelete,
String targetName, AssociationEndCardinality targetCardinality,
boolean targetCascadeDelete, boolean targetClearOnDelete, boolean targetTargetCascadeDelete, boolean targetTargetClearOnDelete
) {
EntityMetaDataImpl source = (EntityMetaDataImpl) getEntityMetaData(sourceEntityName);
if (source == null) throw new IllegalArgumentException("Can't find entity " + sourceEntityName);
EntityMetaDataImpl target = (EntityMetaDataImpl) getEntityMetaData(targetEntityName);
if (target == null) throw new IllegalArgumentException("Can't find entity " + targetEntityName);
AssociationEndType sourceType = null;
AssociationEndType targetType = null;
AssociationMetaDataImpl amd = new AssociationMetaDataImpl();
amd.setType(type);
String fullName = getUniqueAssociationName(sourceEntityName, targetEntityName, sourceName);
amd.setFullName(fullName);
associationMetaDatas.put(fullName, amd);
switch (type) {
case Directed:
sourceType = AssociationEndType.DirectedAssociationEnd;
break;
case Undirected:
sourceType = AssociationEndType.UndirectedAssociationEnd;
targetType = AssociationEndType.UndirectedAssociationEnd;
break;
case Aggregation:
sourceType = AssociationEndType.ParentEnd;
targetType = AssociationEndType.ChildEnd;
break;
}
AssociationEndMetaDataImpl sourceEnd = new AssociationEndMetaDataImpl(
amd, sourceName, target, sourceCardinality, sourceType,
sourceCascadeDelete, sourceClearOnDelete, sourceTargetCascadeDelete, sourceTargetClearOnDelete);
addAssociationEndMetaDataToEntityTypeSubtree(prepare(), source, sourceEnd);
if (type != AssociationType.Directed) {
AssociationEndMetaDataImpl targetEnd = new AssociationEndMetaDataImpl(
amd, targetName, source, targetCardinality, targetType,
targetCascadeDelete, targetClearOnDelete, targetTargetCascadeDelete, targetTargetClearOnDelete);
addAssociationEndMetaDataToEntityTypeSubtree(prepare(), target, targetEnd);
}
return amd;
}
private void addAssociationEndMetaDataToEntityTypeSubtree(Map typeToEntityMetaDatas,
EntityMetaDataImpl emdi, AssociationEndMetaData aemd) {
emdi.addAssociationEndMetaData(aemd);
for (String subType : emdi.getAllSubTypes()) {
((EntityMetaDataImpl) typeToEntityMetaDatas.get(subType)).addAssociationEndMetaData(aemd);
}
}
@Override
public AssociationMetaData removeAssociation(String entityName, String associationName) {
final Map typeToEntityMetaDatas = prepare();
// remove from source
EntityMetaDataImpl source = (EntityMetaDataImpl) getEntityMetaData(entityName);
AssociationEndMetaData aemd =
removeAssociationEndMetaDataFromEntityTypeSubtree(typeToEntityMetaDatas, source, associationName);
AssociationMetaData amd = aemd.getAssociationMetaData();
// remove from target
EntityMetaDataImpl target = (EntityMetaDataImpl) aemd.getOppositeEntityMetaData();
if (amd.getType() != AssociationType.Directed) {
String oppositeAssociationName = amd.getOppositeEnd(aemd).getName();
removeAssociationEndMetaDataFromEntityTypeSubtree(typeToEntityMetaDatas, target, oppositeAssociationName);
}
associationMetaDatas.remove(getUniqueAssociationName(entityName, target.getType(),
associationName));
return amd;
}
private AssociationEndMetaData removeAssociationEndMetaDataFromEntityTypeSubtree(
Map typeToEntityMetaDatas, EntityMetaDataImpl emdi, String associationName) {
AssociationEndMetaData removedEndMetaData = emdi.removeAssociationEndMetaData(associationName);
for (String subType : emdi.getAllSubTypes()) {
((EntityMetaDataImpl) typeToEntityMetaDatas.get(subType)).removeAssociationEndMetaData(associationName);
}
return removedEndMetaData;
}
private static String getUniqueAssociationName(String sourceEntityName, String targetEntityName, String sourceName) {
return sourceEntityName + '.' + sourceName + '-' + targetEntityName;
}
}