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/*******************************************************************************
* Copyright (c) 2010-2018, Gabor Bergmann, IncQuery Labs Ltd.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.viatra.runtime.matchers.memories.timely;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.Set;
import java.util.TreeMap;
import tools.refinery.viatra.runtime.matchers.memories.MaskedTupleMemory;
import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
import tools.refinery.viatra.runtime.matchers.tuple.TupleMask;
import tools.refinery.viatra.runtime.matchers.util.CollectionsFactory;
import tools.refinery.viatra.runtime.matchers.util.Direction;
import tools.refinery.viatra.runtime.matchers.util.Signed;
import tools.refinery.viatra.runtime.matchers.util.TimelyMemory;
import tools.refinery.viatra.runtime.matchers.util.timeline.Diff;
import tools.refinery.viatra.runtime.matchers.util.timeline.Timeline;
/**
* Common parts of timely default and timely unary implementations.
*
* @noextend This class is not intended to be subclassed by clients.
* @author Tamas Szabo
* @since 2.3
*/
abstract class AbstractTimelyMaskedMemory<Timestamp extends Comparable<Timestamp>, KeyType>
extends MaskedTupleMemory<Timestamp> {
protected final TreeMap<Timestamp, Set<KeyType>> foldingStates;
protected final Map<KeyType, TimelyMemory<Timestamp>> memoryMap;
protected final boolean isLazy;
public AbstractTimelyMaskedMemory(final TupleMask mask, final Object owner, final boolean isLazy) {
super(mask, owner);
this.isLazy = isLazy;
this.memoryMap = CollectionsFactory.createMap();
this.foldingStates = this.isLazy ? CollectionsFactory.createTreeMap() : null;
}
@Override
public void initializeWith(final MaskedTupleMemory<Timestamp> other, final Timestamp defaultValue) {
final Iterable<Tuple> signatures = other.getSignatures();
for (final Tuple signature : signatures) {
if (other.isTimely()) {
final Map<Tuple, Timeline<Timestamp>> tupleMap = other.getWithTimeline(signature);
for (final Entry<Tuple, Timeline<Timestamp>> entry : tupleMap.entrySet()) {
for (final Signed<Timestamp> signed : entry.getValue().asChangeSequence()) {
if (signed.getDirection() == Direction.DELETE) {
this.removeWithTimestamp(entry.getKey(), signed.getPayload());
} else {
this.addWithTimestamp(entry.getKey(), signed.getPayload());
}
}
}
} else {
final Collection<Tuple> tuples = other.get(signature);
for (final Tuple tuple : tuples) {
this.addWithTimestamp(tuple, defaultValue);
}
}
}
}
public boolean isPresentAtInfinityInteral(KeyType key) {
final TimelyMemory<Timestamp> values = this.memoryMap.get(key);
if (values == null) {
return false;
} else {
return values.getCountAtInfinity() != 0;
}
}
@Override
public void clear() {
this.memoryMap.clear();
}
@Override
public int getKeysetSize() {
return this.memoryMap.keySet().size();
}
@Override
public int getTotalSize() {
int i = 0;
for (final Entry<KeyType, TimelyMemory<Timestamp>> entry : this.memoryMap.entrySet()) {
i += entry.getValue().size();
}
return i;
}
@Override
public Iterator<Tuple> iterator() {
return this.memoryMap.values().stream().flatMap(e -> e.keySet().stream()).iterator();
}
protected Collection<Tuple> getInternal(final KeyType key) {
final TimelyMemory<Timestamp> memory = this.memoryMap.get(key);
if (memory == null) {
return null;
} else {
return memory.getTuplesAtInfinity();
}
}
public Map<Tuple, Timeline<Timestamp>> getWithTimestampInternal(final KeyType key) {
final TimelyMemory<Timestamp> memory = this.memoryMap.get(key);
if (memory == null) {
return null;
} else {
return memory.asMap();
}
}
protected Diff<Timestamp> removeInternal(final KeyType key, final Tuple tuple, final Timestamp timestamp) {
Timestamp oldResumableTimestamp = null;
Timestamp newResumableTimestamp = null;
final TimelyMemory<Timestamp> keyMemory = this.memoryMap.get(key);
if (keyMemory == null) {
throw raiseDuplicateDeletion(tuple);
}
if (this.isLazy) {
oldResumableTimestamp = keyMemory.getResumableTimestamp();
}
Diff<Timestamp> diff = null;
try {
diff = keyMemory.remove(tuple, timestamp);
} catch (final IllegalStateException e) {
throw raiseDuplicateDeletion(tuple);
}
if (keyMemory.isEmpty()) {
this.memoryMap.remove(key);
}
if (this.isLazy) {
newResumableTimestamp = keyMemory.getResumableTimestamp();
if (!Objects.equals(oldResumableTimestamp, newResumableTimestamp)) {
unregisterFoldingState(oldResumableTimestamp, key);
registerFoldingState(newResumableTimestamp, key);
}
}
return diff;
}
protected Diff<Timestamp> addInternal(final KeyType key, final Tuple tuple, final Timestamp timestamp) {
Timestamp oldResumableTimestamp = null;
Timestamp newResumableTimestamp = null;
final TimelyMemory<Timestamp> keyMemory = this.memoryMap.computeIfAbsent(key,
k -> new TimelyMemory<Timestamp>(this.isLazy));
if (this.isLazy) {
oldResumableTimestamp = keyMemory.getResumableTimestamp();
}
final Diff<Timestamp> diff = keyMemory.put(tuple, timestamp);
if (this.isLazy) {
newResumableTimestamp = keyMemory.getResumableTimestamp();
if (!Objects.equals(oldResumableTimestamp, newResumableTimestamp)) {
unregisterFoldingState(oldResumableTimestamp, key);
registerFoldingState(newResumableTimestamp, key);
}
}
return diff;
}
@Override
public Diff<Timestamp> removeWithTimestamp(final Tuple tuple, final Timestamp timestamp) {
return removeWithTimestamp(tuple, null, timestamp);
}
@Override
public Diff<Timestamp> addWithTimestamp(final Tuple tuple, final Timestamp timestamp) {
return addWithTimestamp(tuple, null, timestamp);
}
@Override
public boolean isTimely() {
return true;
}
protected void registerFoldingState(final Timestamp timestamp, final KeyType key) {
if (timestamp != null) {
this.foldingStates.compute(timestamp, (k, v) -> {
if (v == null) {
v = CollectionsFactory.createSet();
}
v.add(key);
return v;
});
}
}
protected void unregisterFoldingState(final Timestamp timestamp, final KeyType key) {
if (timestamp != null) {
this.foldingStates.compute(timestamp, (k, v) -> {
v.remove(key);
return v.isEmpty() ? null : v;
});
}
}
@Override
public Timestamp getResumableTimestamp() {
if (this.foldingStates == null || this.foldingStates.isEmpty()) {
return null;
} else {
return this.foldingStates.firstKey();
}
}
}
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