/*
* Licensed to the Apache Software Foundation (ASF) under one or more contributor license
* agreements. See the NOTICE file distributed with this work for additional information regarding
* copyright ownership. The ASF licenses this file to You 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 org.apache.geode.internal.cache.persistence.query;
import org.apache.geode.internal.cache.CachedDeserializable;
/**
* The contract for a sorted map that maps the pair (index key, regionKey) to an optional value.
*
* All read API take INDEX keys, and return REGION keys. So for example keyIterator takes a range of
* index keys and returns the associated region keys.
*
* The index key is allowed to be an object, or a CachedDeserializable.
*
* This class is threadsafe. Iterators will reflect all entries added to the map up until the time
* that the iterator was obtained. After that they may or may not reflect modifications to the map
* while the iteration is in progress. They will guarantee that entries will be returned in the
* correct order.
*
* TODO - is the user required to filter out NULL index keys, or should we provide separate NULL
* iterators.
*
* TODO - Do we need getKey, getValue,
*
* @since GemFire cedar
*/
public interface IndexMap {
/**
* Add an entry to the map. If the same indexKey, regionKey pair exists in the map is it replaced
* with the new value.
*
* @param indexKey the index key for the entry. The index key may be NULL.
* @param regionKey the region key for the entry. The region key cannot be NULL.
* @param value a value for the entry, or NULL for no value
*/
void put(Object indexKey, Object regionKey, Object value);
/**
* Remove an entry from the map.
*
* @param indexKey the index key to remove
* @param regionKey the region key to remove
*
* This method has no effect if the indexKey, regionKey does not exist in the map.
*/
void remove(Object indexKey, Object regionKey);
/**
* Return all of the IndexEntries that map to a given region key.
*/
CloseableIterator<IndexEntry> get(Object indexKey);
/**
* Return the set of index keys for a given region key.
*/
CloseableIterator<CachedDeserializable> getKey(Object indexKey);
/**
* Return all of the IndexEntries in the range between start and end. If end < start, this will
* return a descending iterator going from end to start.
*/
CloseableIterator<IndexEntry> iterator(Object start, boolean startInclusive, Object end,
boolean endInclusive);
/**
* Return all of the IndexEntries that from start to the tail of the map.
*/
CloseableIterator<IndexEntry> iterator(Object start, boolean startInclusive);
/**
* Return all of the IndexEntries in the map.
*/
CloseableIterator<IndexEntry> iterator();
/**
* Return all of the IndexEntries from the end to the head of the map.
*/
CloseableIterator<IndexEntry> descendingIterator(Object end, boolean endInclusive);
/**
* Return all of the IndexEntries in the map in descending order.
*/
CloseableIterator<IndexEntry> descendingIterator();
/**
* Return all of the region keys from start to end.
*/
CloseableIterator<CachedDeserializable> keyIterator(Object start, boolean startInclusive,
Object end, boolean endInclusive);
/**
* Return all of the region keys from start to the tail of the map
*/
CloseableIterator<CachedDeserializable> keyIterator(Object start, boolean startInclusive);
/**
* Return all of the region keys in the map
*/
CloseableIterator<CachedDeserializable> keyIterator();
/**
* Return all of the region keys from the end to the head of the map, in descending order.
*/
CloseableIterator<CachedDeserializable> descendingKeyIterator(Object end, boolean endInclusive);
/**
* Return all of the region keys in the map, in descending order.
*/
CloseableIterator<CachedDeserializable> descendingKeyIterator();
/**
* Return the estimate of the size of the map in the given range, inclusive.
*/
long size(Object start, Object end);
/**
* Return an estimate of the size of the map from the given key to get end of the map
*/
long sizeToEnd(Object start);
/**
* Return an estimate of the size of the map from the beginning to the given key
*/
long sizeFromStart(Object end);
/**
* Return an estimate of the size of the map.
*/
long size();
/**
* Destroy the index map and remove all data from disk. Once a map is destroyed, it will not be
* recovered.
*/
public void destroy();
/**
* A single entry in an index
*
* @since GemFire cedar
*/
interface IndexEntry {
/**
* Return the index key of the entry. May be NULL.
*/
CachedDeserializable getKey();
/**
* Return the region key for the index
*/
CachedDeserializable getRegionKey();
/**
* Return the value of the entry. May be NULL.
*/
CachedDeserializable getValue();
}
}