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package org.eclipse.viatra.solver.data.map;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.eclipse.viatra.solver.data.map.internal.ImmutableNode;
import org.eclipse.viatra.solver.data.map.internal.MapDiffCursor;
import org.eclipse.viatra.solver.data.map.internal.Node;
import org.eclipse.viatra.solver.data.map.internal.VersionedMapImpl;
public class VersionedMapStoreImpl<K, V> implements VersionedMapStore<K, V> {
// Configuration
private final boolean immutableWhenCommiting;
// Static data
protected final ContinousHashProvider<K> hashProvider;
protected final V defaultValue;
// Dynamic data
protected final Map<Long, ImmutableNode<K, V>> states = new HashMap<>();
protected final Map<Node<K, V>, ImmutableNode<K, V>> nodeCache;
protected long nextID = 0;
public VersionedMapStoreImpl(ContinousHashProvider<K> hashProvider, V defaultValue,
VersionedMapStoreConfiguration config) {
this.immutableWhenCommiting = config.isImmutableWhenCommiting();
this.hashProvider = hashProvider;
this.defaultValue = defaultValue;
if (config.isSharedNodeCacheInStore()) {
nodeCache = new HashMap<>();
} else {
nodeCache = null;
}
}
private VersionedMapStoreImpl(ContinousHashProvider<K> hashProvider, V defaultValue,
Map<Node<K, V>, ImmutableNode<K, V>> nodeCache, VersionedMapStoreConfiguration config) {
this.immutableWhenCommiting = config.isImmutableWhenCommiting();
this.hashProvider = hashProvider;
this.defaultValue = defaultValue;
this.nodeCache = nodeCache;
}
public VersionedMapStoreImpl(ContinousHashProvider<K> hashProvider, V defaultValue) {
this(hashProvider, defaultValue, new VersionedMapStoreConfiguration());
}
public static <K, V> List<VersionedMapStore<K, V>> createSharedVersionedMapStores(int amount,
ContinousHashProvider<K> hashProvider, V defaultValue,
VersionedMapStoreConfiguration config) {
List<VersionedMapStore<K, V>> result = new ArrayList<>(amount);
if (config.isSharedNodeCacheInStoreGroups()) {
Map<Node<K, V>, ImmutableNode<K, V>> nodeCache;
if (config.isSharedNodeCacheInStore()) {
nodeCache = new HashMap<>();
} else {
nodeCache = null;
}
for (int i = 0; i < amount; i++) {
result.add(new VersionedMapStoreImpl<>(hashProvider, defaultValue, nodeCache, config));
}
} else {
for (int i = 0; i < amount; i++) {
result.add(new VersionedMapStoreImpl<>(hashProvider, defaultValue, config));
}
}
return result;
}
public static <K, V> List<VersionedMapStore<K, V>> createSharedVersionedMapStores(int amount,
ContinousHashProvider<K> hashProvider, V defaultValue) {
return createSharedVersionedMapStores(amount, hashProvider, defaultValue, new VersionedMapStoreConfiguration());
}
@Override
public synchronized Set<Long> getStates() {
return new HashSet<>(states.keySet());
}
@Override
public VersionedMap<K, V> createMap() {
return new VersionedMapImpl<>(this, hashProvider, defaultValue);
}
@Override
public VersionedMap<K, V> createMap(long state) {
ImmutableNode<K, V> data = revert(state);
return new VersionedMapImpl<>(this, hashProvider, defaultValue, data);
}
public synchronized ImmutableNode<K, V> revert(long state) {
if (states.containsKey(state)) {
return states.get(state);
} else {
ArrayList<Long> existingKeys = new ArrayList<>(states.keySet());
Collections.sort(existingKeys);
throw new IllegalArgumentException("Store does not contain state " + state + "! Avaliable states: "
+ Arrays.toString(existingKeys.toArray()));
}
}
public synchronized long commit(Node<K, V> data, VersionedMapImpl<K, V> mapToUpdateRoot) {
ImmutableNode<K, V> immutable;
if (data != null) {
immutable = data.toImmutable(this.nodeCache);
} else {
immutable = null;
}
if (nextID == Long.MAX_VALUE)
throw new IllegalStateException("Map store run out of Id-s");
long id = nextID++;
this.states.put(id, immutable);
if (this.immutableWhenCommiting) {
mapToUpdateRoot.setRoot(immutable);
}
return id;
}
@Override
public DiffCursor<K, V> getDiffCursor(long fromState, long toState) {
VersionedMap<K, V> map1 = createMap(fromState);
VersionedMap<K, V> map2 = createMap(toState);
Cursor<K, V> cursor1 = map1.getAll();
Cursor<K, V> cursor2 = map2.getAll();
return new MapDiffCursor<>(this.hashProvider, this.defaultValue, cursor1, cursor2);
}
}
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