com.hydraql.dsl.context.HBaseSqlContext Maven / Gradle / Ivy

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/*
 * 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 com.hydraql.dsl.context;

import com.hydraql.common.util.StringUtil;
import com.hydraql.dsl.model.HBaseTableSchema;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.stream.Collectors;

/**
 * @author leojie 2022/12/4 00:03
 */
public class HBaseSqlContext {
  private volatile static HBaseSqlContext sqlContext;
  private final ConcurrentMap tableSchemaMap;

  private HBaseSqlContext() {
    tableSchemaMap = new ConcurrentHashMap<>();
  }

  public static HBaseSqlContext getInstance() {
    if (sqlContext == null) {
      synchronized (HBaseSqlContext.class) {
        if (sqlContext == null) {
          sqlContext = new HBaseSqlContext();
        }
      }
    }
    return sqlContext;
  }

  public void registerTableSchema(String schemaUniqueKey, HBaseTableSchema tableSchema) {
    if (StringUtil.isBlank(schemaUniqueKey)) {
      return;
    }
    if (tableSchema == null) {
      return;
    }
    tableSchemaMap.remove(schemaUniqueKey);
    tableSchemaMap.put(schemaUniqueKey, tableSchema);
  }

  public void removeTableSchema(String schemaUniqueKey) {
    if (StringUtil.isBlank(schemaUniqueKey)) {
      return;
    }
    tableSchemaMap.remove(schemaUniqueKey);
  }

  public HBaseTableSchema getTableSchema(String schemaUniqueKey) {
    if (StringUtil.isBlank(schemaUniqueKey)) {
      throw new IllegalArgumentException("The schemaUniqueKey is not empty.");
    }
    return tableSchemaMap.get(schemaUniqueKey);
  }

  public List getAllRegisteredVirtualTables() {
    if (tableSchemaMap.isEmpty()) {
      return new ArrayList<>(0);
    }
    return tableSchemaMap.values().stream().map(HBaseTableSchema::getTableName)
        .collect(Collectors.toList());
  }

}