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Transaction.java
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Transaction.java
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package org.genericsystem.kernel;
import java.io.Serializable;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Stream;
import org.genericsystem.api.core.IndexFilter;
import org.genericsystem.api.core.Snapshot;
import org.genericsystem.api.core.exceptions.ConcurrencyControlException;
import org.genericsystem.api.core.exceptions.OptimisticLockConstraintViolationException;
import org.genericsystem.common.CheckedContext;
import org.genericsystem.common.Generic;
import org.genericsystem.common.IDependencies;
import org.genericsystem.common.IDifferential;
import org.genericsystem.kernel.AbstractServer.RootServerHandler;
import javafx.beans.Observable;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.collections.ObservableList;
/**
* @author Nicolas Feybesse
*
*/
public class Transaction extends CheckedContext implements IDifferential<Generic> {
private final long ts;
public Transaction(AbstractServer root, long ts) {
super(root);
this.ts = ts;
}
public Transaction(AbstractServer root) {
this(root, root.pickNewTs());
}
@Override
public AbstractServer getRoot() {
return (AbstractServer) super.getRoot();
}
@Override
public long getTs() {
return ts;
}
@Override
public ObjectProperty<IDifferential<Generic>> getDifferentialProperty() {
throw new UnsupportedOperationException();
}
@Override
public Map<Generic, ObservableList<Generic>> getDependenciesAsOservableListCacheMap() {
throw new UnsupportedOperationException();
}
protected Generic plug(Generic generic) {
if (getRoot().isInitialized())
((RootServerHandler) generic.getProxyHandler()).getLifeManager().beginLife(getTs());
Set<Generic> set = new HashSet<>();
if (!generic.isMeta())
set.add(generic.getMeta());
set.addAll(generic.getSupers());
set.addAll(generic.getComponents());
set.stream().forEach(ancestor -> ((IDependencies<Generic>) getDependencies(ancestor)).add(generic));
// getChecker().checkAfterBuild(true, false, generic);
return generic;
}
private void kill(Generic generic) {
// getChecker().checkAfterBuild(false, false, generic);
((RootServerHandler) generic.getProxyHandler()).getLifeManager().kill(getTs());
getRoot().getGarbageCollector().add(generic);
}
protected void unplug(Generic generic) {
// getChecker().checkAfterBuild(false, false, generic);
Set<Generic> set = new HashSet<>();
if (!generic.isMeta())
set.add(generic.getMeta());
set.addAll(generic.getSupers());
set.addAll(generic.getComponents());
set.stream().forEach(ancestor -> ((IDependencies<Generic>) getDependencies(ancestor)).remove(generic));
((RootServerHandler) generic.getProxyHandler()).getLifeManager().kill(getTs());
getRoot().getGarbageCollector().add(generic);
}
@Override
public Snapshot<Generic> getDependencies(Generic ancestor) {
assert ancestor != null;
return new IDependencies<Generic>() {
@Override
public Stream<Generic> unfilteredStream() {
return ((RootServerHandler) ancestor.getProxyHandler()).getDependencies().stream(getTs());
}
@Override
public Snapshot<Generic> filter(List<IndexFilter> filters) {
return ((RootServerHandler) ancestor.getProxyHandler()).getDependencies().filter(filters, getTs());
}
@Override
public Generic get(Object o) {
return ((RootServerHandler) ancestor.getProxyHandler()).getDependencies().get((Generic) o, getTs());
}
@Override
public void add(Generic add) {
((RootServerHandler) ancestor.getProxyHandler()).getDependencies().add(add);
}
@Override
public boolean remove(Generic remove) {
return ((RootServerHandler) ancestor.getProxyHandler()).getDependencies().remove(remove);
}
};
}
@Override
public void apply(Snapshot<Generic> removes, Snapshot<Generic> adds) throws ConcurrencyControlException, OptimisticLockConstraintViolationException {
new LockedLifeManager().apply(removes, adds);
}
// archiver acces
protected Generic buildAndPlug(Long ts, Class<?> clazz, Generic meta, List<Generic> supers, Serializable value, List<Generic> components, long[] otherTs) {
return plug(getRoot().build(ts, clazz, meta, supers, value, components, otherTs));
}
private class LockedLifeManager {
private Set<LifeManager> lockedLifeManagers = new HashSet<>();
private void apply(Iterable<Generic> removes, Iterable<Generic> adds) throws ConcurrencyControlException, OptimisticLockConstraintViolationException {
try {
writeLockAllAndCheckMvcc(adds, removes);
for (Generic remove : removes)
kill(remove);
for (Generic add : adds) {
plug(add);
}
} finally {
writeUnlockAll();
}
}
private void writeLockAllAndCheckMvcc(Iterable<Generic> adds, Iterable<Generic> removes) throws ConcurrencyControlException, OptimisticLockConstraintViolationException {
for (Generic remove : removes)
writeLockAndCheckMvcc(remove);
for (Generic add : adds)
writeLockAndCheckMvccForAdd(add);
}
private void writeLockAndCheckMvccForAdd(Generic add) throws ConcurrencyControlException, OptimisticLockConstraintViolationException {
writeLockAndCheckMvcc(add.getMeta());
for (Generic superT : add.getSupers())
writeLockAndCheckMvcc(superT);
for (Generic component : add.getComponents())
writeLockAndCheckMvcc(component);
writeLockAndCheckMvcc(add);
}
private void writeLockAndCheckMvcc(Generic generic) throws ConcurrencyControlException, OptimisticLockConstraintViolationException {
if (generic != null) {
LifeManager manager = ((RootServerHandler) generic.getProxyHandler()).getLifeManager();
if (!lockedLifeManagers.contains(manager)) {
manager.writeLock();
lockedLifeManagers.add(manager);
manager.checkMvcc(getTs());
}
}
}
private void writeUnlockAll() {
for (LifeManager lifeManager : lockedLifeManagers)
lifeManager.writeUnlock();
lockedLifeManagers = new HashSet<>();
}
}
@Override
public Observable getObservable(Generic generic) {
return new SimpleObjectProperty<Snapshot<Generic>>();
}
// @Override
// public CompletableFuture<Snapshot<Generic>> getDependenciesPromise(Generic generic) {
// throw new UnsupportedOperationException();
// }
}