com.linkedin.pinot.controller.helix.core.realtime.TableConfigCache.java Source code

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Here is the source code for com.linkedin.pinot.controller.helix.core.realtime.TableConfigCache.java

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/**
 * Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
 *
 * 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.linkedin.pinot.controller.helix.core.realtime;

import com.linkedin.pinot.common.config.TableConfig;
import com.linkedin.pinot.common.metadata.ZKMetadataProvider;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import org.apache.helix.ZNRecord;
import org.apache.helix.store.zk.ZkHelixPropertyStore;

/**
 * Cache for table config.
 */
public class TableConfigCache {

    // TODO: Make cache size, timeout configurable through controller config.
    private static final long DEFAULT_CACHE_SIZE = 50;
    private static final long DEFAULT_CACHE_TIMEOUT_IN_MINUTE = 60;

    private final LoadingCache<String, TableConfig> _tableConfigCache;
    private final ZkHelixPropertyStore<ZNRecord> _propertyStore;

    public TableConfigCache(ZkHelixPropertyStore<ZNRecord> propertyStore) {
        _tableConfigCache = CacheBuilder.newBuilder().maximumSize(DEFAULT_CACHE_SIZE)
                .expireAfterWrite(DEFAULT_CACHE_TIMEOUT_IN_MINUTE, TimeUnit.MINUTES)
                .build(new CacheLoader<String, TableConfig>() {
                    @Override
                    public TableConfig load(String tableNameWithType) throws Exception {
                        return ZKMetadataProvider.getTableConfig(_propertyStore, tableNameWithType);
                    }
                });
        _propertyStore = propertyStore;
    }

    public TableConfig getTableConfig(String tableNameWithType) throws ExecutionException {
        return _tableConfigCache.get(tableNameWithType);
    }
}