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Lock-free document store—optimized for high rate atomic state changes—that concurrently commits and compacts on-disk log-structured storage files without blocking parallel in-memory updates to associative B-tree maps, spatial Q-tree maps, sequential S-tree lists, and singleton U-tree values
// Copyright 2015-2020 SWIM.AI inc.
//
// 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 swim.db;
import swim.math.Z2Form;
import swim.spatial.SpatialMap;
import swim.structure.Slot;
import swim.structure.Value;
import swim.util.Cursor;
final class QTreeEntryCursor implements Cursor> {
final Cursor inner;
final Z2Form shapeForm;
QTreeEntryCursor(Cursor inner, Z2Form shapeForm) {
this.inner = inner;
this.shapeForm = shapeForm;
}
@Override
public boolean isEmpty() {
return this.inner.isEmpty();
}
@Override
public SpatialMap.Entry head() {
final Slot slot = this.inner.head();
final Value key = slot.key();
final S shape = this.shapeForm.cast(slot.toValue());
final Value value = slot.toValue().body();
return new SpatialMap.SimpleEntry(key, shape, value);
}
@Override
public void step() {
this.inner.step();
}
@Override
public void skip(long count) {
this.inner.skip(count);
}
@Override
public boolean hasNext() {
return this.inner.hasNext();
}
@Override
public long nextIndexLong() {
return this.inner.nextIndexLong();
}
@Override
public int nextIndex() {
return this.inner.nextIndex();
}
@Override
public SpatialMap.Entry next() {
final Slot slot = this.inner.next();
final Value key = slot.key();
final S shape = this.shapeForm.cast(slot.toValue());
final Value value = slot.toValue().body();
return new SpatialMap.SimpleEntry(key, shape, value);
}
@Override
public boolean hasPrevious() {
return this.inner.hasPrevious();
}
@Override
public long previousIndexLong() {
return this.inner.previousIndexLong();
}
@Override
public int previousIndex() {
return this.inner.previousIndex();
}
@Override
public SpatialMap.Entry previous() {
final Slot slot = this.inner.previous();
final Value key = slot.key();
final S shape = this.shapeForm.cast(slot.toValue());
final Value value = slot.toValue().body();
return new SpatialMap.SimpleEntry(key, shape, value);
}
@Override
public void load() throws InterruptedException {
this.inner.load();
}
}