| /* |
| * 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.calcite.statistic; |
| |
| import org.apache.calcite.materialize.SqlStatisticProvider; |
| import org.apache.calcite.plan.RelOptTable; |
| import org.apache.calcite.util.ImmutableIntList; |
| import org.apache.calcite.util.Util; |
| |
| import com.google.common.cache.Cache; |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.util.concurrent.UncheckedExecutionException; |
| |
| import java.util.List; |
| import java.util.concurrent.ExecutionException; |
| |
| /** |
| * Implementation of {@link SqlStatisticProvider} that reads and writes a |
| * cache. |
| */ |
| public class CachingSqlStatisticProvider implements SqlStatisticProvider { |
| private final SqlStatisticProvider provider; |
| private final Cache<List, Object> cache; |
| |
| public CachingSqlStatisticProvider(SqlStatisticProvider provider, |
| Cache<List, Object> cache) { |
| super(); |
| this.provider = provider; |
| this.cache = cache; |
| } |
| |
| @Override public double tableCardinality(RelOptTable table) { |
| try { |
| final ImmutableList<Object> key = |
| ImmutableList.of("tableCardinality", |
| table.getQualifiedName()); |
| return (Double) cache.get(key, |
| () -> provider.tableCardinality(table)); |
| } catch (UncheckedExecutionException | ExecutionException e) { |
| throw Util.throwAsRuntime(Util.causeOrSelf(e)); |
| } |
| } |
| |
| @Override public boolean isForeignKey(RelOptTable fromTable, List<Integer> fromColumns, |
| RelOptTable toTable, List<Integer> toColumns) { |
| try { |
| final ImmutableList<Object> key = |
| ImmutableList.of("isForeignKey", |
| fromTable.getQualifiedName(), |
| ImmutableIntList.copyOf(fromColumns), |
| toTable.getQualifiedName(), |
| ImmutableIntList.copyOf(toColumns)); |
| return (Boolean) cache.get(key, |
| () -> provider.isForeignKey(fromTable, fromColumns, toTable, |
| toColumns)); |
| } catch (UncheckedExecutionException | ExecutionException e) { |
| throw Util.throwAsRuntime(Util.causeOrSelf(e)); |
| } |
| } |
| |
| @Override public boolean isKey(RelOptTable table, List<Integer> columns) { |
| try { |
| final ImmutableList<Object> key = |
| ImmutableList.of("isKey", table.getQualifiedName(), |
| ImmutableIntList.copyOf(columns)); |
| return (Boolean) cache.get(key, () -> provider.isKey(table, columns)); |
| } catch (UncheckedExecutionException | ExecutionException e) { |
| throw Util.throwAsRuntime(Util.causeOrSelf(e)); |
| } |
| } |
| } |