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PseudoConcurrentCollection.java
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PseudoConcurrentCollection.java
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package org.genericsystem.common;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Spliterators;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import org.genericsystem.api.core.FiltersBuilder;
import org.genericsystem.api.core.IGeneric;
import org.genericsystem.api.core.IndexFilter;
import org.genericsystem.api.core.Snapshot;
import io.reactivex.Observable;
import io.reactivex.subjects.PublishSubject;
import io.reactivex.subjects.Subject;
/**
* @author Nicolas Feybesse
*
* @param <T>
*/
public class PseudoConcurrentCollection<T extends IGeneric<?>> implements Snapshot<T> {
private static interface Index<T> {
public boolean add(T generic);
public boolean remove(T generic);
public Iterator<T> iterator();
public Stream<T> stream();
}
final Map<T, T> map = new HashMap<>();
private final IndexNode indexesTree = new IndexNode(new IndexImpl(new IndexFilter(FiltersBuilder.NO_FILTER), null));
private class IndexNode {
private Index<T> index;
private SoftValueHashMap<IndexFilter, IndexNode> children = new SoftValueHashMap<IndexFilter, IndexNode>() {
@Override
public synchronized IndexNode get(Object key) {
IndexNode result = super.get(key);
if (result == null) {
IndexNode newValue = new IndexNode(new IndexImpl((IndexFilter) key, index));
put((IndexFilter) key, newValue);
return newValue;
}
return result;
}
};
IndexNode(Index<T> index) {
this.index = index;
}
Index<T> getIndex(List<IndexFilter> filters) {
if (filters.isEmpty())
return index;
return children.get(filters.get(0)).getIndex(filters.subList(1, filters.size()));
}
public void add(T generic) {
if (index.add(generic))
children.values().forEach(childNode -> childNode.add(generic));
cleanUp();
}
public boolean remove(T generic) {
boolean result = index.remove(generic);
if (result)
children.values().forEach(childNode -> childNode.remove(generic));
cleanUp();
return result;
}
private void cleanUp() {
List<IndexFilter> removes = new ArrayList<>(children.keySet()).stream().filter(key -> !key.isAlive()).collect(Collectors.toList());
removes.forEach(key -> children.remove(key));
}
}
private class IndexImpl implements Index<T> {
private Node<T> head = null;
private Node<T> tail = null;
private final IndexFilter filter;
IndexImpl(IndexFilter filter, Index<T> parent) {
this.filter = filter;
if (parent != null)
parent.stream().forEach(generic -> {
if (filter.test(generic))
add(generic);
});
}
@Override
public boolean add(T element) {
assert element != null;
if (filter.test(element)) {
Node<T> newNode = new Node<>(element);
if (head == null)
head = newNode;
else
tail.next = newNode;
tail = newNode;
map.put(element, element);
return true;
}
return false;
}
@Override
public boolean remove(T element) {
Iterator<T> iterator = iterator();
while (iterator.hasNext())
if (element.equals(iterator.next())) {
iterator.remove();
return true;
}
return false;
}
@Override
public Iterator<T> iterator() {
return new InternalIterator();
}
@Override
public Stream<T> stream() {
return StreamSupport.stream(Spliterators.spliteratorUnknownSize(new InternalIterator(), 0), false);
}
public class InternalIterator extends AbstractIterator<Node<T>, T> implements Iterator<T> {
private Node<T> last;
@Override
protected void advance() {
last = next;
next = next == null ? head : next.next;
}
@Override
public T project() {
return next.content;
}
@Override
public void remove() {
if (next == null)
throw new IllegalStateException();
map.remove(next.content);
if (last == null) {
head = next.next;
next = null;
} else {
last.next = next.next;
if (next.next == null)
tail = last;
}
}
}
}
private static class Node<T> {
private final T content;
private Node<T> next;
private Node(T content) {
this.content = content;
}
}
@Override
public Iterator<T> iterator() {
return indexesTree.getIndex(new ArrayList<>()).iterator();
}
@Override
public Stream<T> unfilteredStream() {
return indexesTree.getIndex(new ArrayList<>()).stream();
}
@Override
public Snapshot<T> filter(List<IndexFilter> filters) {
return new Snapshot<T>() {
@Override
public Stream<T> unfilteredStream() {
return indexesTree.getIndex(filters).stream();
}
};
}
public void add(T element) {
indexesTree.add(element);
adds.onNext(element);
}
public boolean remove(T element) {
boolean result = indexesTree.remove(element);
if (result)
removes.onNext(element);
return result;
}
@Override
public T get(Object o) {
return map.get(o);
}
@SuppressWarnings({ "unchecked", "rawtypes" })
private Subject<T> adds = (Subject) PublishSubject.create().toSerialized();
@SuppressWarnings({ "unchecked", "rawtypes" })
private Subject<T> removes = (Subject) PublishSubject.create().toSerialized();
public Observable<T> getFilteredAdds(Predicate<T> predicate) {
return adds.hide().filter(x -> fireInvalidations && predicate.test(x));
}
public Observable<T> getFilteredRemoves(Predicate<T> predicate) {
return removes.hide().filter(x -> fireInvalidations && predicate.test(x));
}
private boolean fireInvalidations = true;
public void disableInvalidations() {
fireInvalidations = false;
}
public void enableInvalidations() {
fireInvalidations = true;
}
}