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/*
* Copyright (c) 2008-2016, Hazelcast, Inc. All Rights Reserved.
*
* 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 com.hazelcast.query.impl;
import com.hazelcast.nio.serialization.Data;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ConcurrentSkipListMap;
/**
* Store indexes rankly.
*/
public class SortedIndexStore extends BaseIndexStore {
private final ConcurrentMap recordsWithNullValue
= new ConcurrentHashMap();
private final ConcurrentSkipListMap> recordMap
= new ConcurrentSkipListMap>();
@Override
void newIndexInternal(Comparable newValue, QueryableEntry record) {
if (newValue instanceof IndexImpl.NullObject) {
recordsWithNullValue.put(record.getKeyData(), record);
} else {
mapAttributeToEntry(newValue, record);
}
}
private void mapAttributeToEntry(Comparable attribute, QueryableEntry entry) {
ConcurrentMap records = recordMap.get(attribute);
if (records == null) {
records = new ConcurrentHashMap(1, LOAD_FACTOR, 1);
recordMap.put(attribute, records);
}
records.put(entry.getKeyData(), entry);
}
@Override
void removeIndexInternal(Comparable oldValue, Data indexKey) {
if (oldValue instanceof IndexImpl.NullObject) {
recordsWithNullValue.remove(indexKey);
} else {
removeMappingForAttribute(oldValue, indexKey);
}
}
private void removeMappingForAttribute(Comparable attribute, Data indexKey) {
ConcurrentMap records = recordMap.get(attribute);
if (records != null) {
records.remove(indexKey);
if (records.size() == 0) {
recordMap.remove(attribute);
}
}
}
@Override
public void clear() {
takeWriteLock();
try {
recordsWithNullValue.clear();
recordMap.clear();
} finally {
releaseWriteLock();
}
}
@Override
public Set getSubRecordsBetween(Comparable from, Comparable to) {
takeReadLock();
try {
MultiResultSet results = createMultiResultSet();
SortedMap> subMap =
recordMap.subMap(from, true, to, true);
for (ConcurrentMap value : subMap.values()) {
copyToMultiResultSet(results, value);
}
return results;
} finally {
releaseReadLock();
}
}
@Override
public Set getSubRecords(ComparisonType comparisonType, Comparable searchedValue) {
takeReadLock();
try {
MultiResultSet results = createMultiResultSet();
SortedMap> subMap;
switch (comparisonType) {
case LESSER:
subMap = recordMap.headMap(searchedValue, false);
break;
case LESSER_EQUAL:
subMap = recordMap.headMap(searchedValue, true);
break;
case GREATER:
subMap = recordMap.tailMap(searchedValue, false);
break;
case GREATER_EQUAL:
subMap = recordMap.tailMap(searchedValue, true);
break;
case NOT_EQUAL:
// TODO There maybe more efficient way such as
// Make a copy of current record map and just remove searched value.
// So remaining records are not equal to searched value
for (Map.Entry> entry : recordMap.entrySet()) {
if (!searchedValue.equals(entry.getKey())) {
copyToMultiResultSet(results, entry.getValue());
}
}
return results;
default:
throw new IllegalArgumentException("Unrecognized comparisonType: " + comparisonType);
}
for (ConcurrentMap value : subMap.values()) {
copyToMultiResultSet(results, value);
}
return results;
} finally {
releaseReadLock();
}
}
@Override
public Set getRecords(Comparable value) {
takeReadLock();
try {
if (value instanceof IndexImpl.NullObject) {
return toSingleResultSet(recordsWithNullValue);
} else {
return toSingleResultSet(recordMap.get(value));
}
} finally {
releaseReadLock();
}
}
@Override
public Set getRecords(Set values) {
takeReadLock();
try {
MultiResultSet results = createMultiResultSet();
for (Comparable value : values) {
ConcurrentMap records;
if (value instanceof IndexImpl.NullObject) {
records = recordsWithNullValue;
} else {
records = recordMap.get(value);
}
if (records != null) {
copyToMultiResultSet(results, records);
}
}
return results;
} finally {
releaseReadLock();
}
}
@Override
public String toString() {
return "SortedIndexStore{"
+ "recordMap=" + recordMap.size()
+ '}';
}
}
