org.apache.zeppelin.jdbc.DemonThread.java Source code

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Here is the source code for org.apache.zeppelin.jdbc.DemonThread.java

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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 org.apache.zeppelin.jdbc;

import java.io.IOException;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Set;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.collect.Sets;
import com.google.common.collect.Sets.SetView;

/**
 * 
 * @author Lomou
 *
 */
public class DemonThread extends Thread {

    private Connection connection;
    private String propertykey;
    private SqlCompleter sqlCompleter;

    private Logger logger = LoggerFactory.getLogger(JDBCInterpreter.class);

    public DemonThread(Connection connection, String propertykey, SqlCompleter sqlCompleter) {
        this.connection = connection;
        this.propertykey = propertykey;
        this.sqlCompleter = sqlCompleter;
    }

    public void run() {
        if (Thread.currentThread().isDaemon()) {
            //System.out.println("DemonThread.run() " + "demon existing");
            try {
                sqlCompleter = createSqlCompleter(connection);
            } catch (Exception e) {
                sqlCompleter = createSqlCompleter(null);
            }
        }
    }

    private SqlCompleter createSqlCompleter(Connection jdbcConnection) {

        SqlCompleter completer = null;
        try {
            Set<String> keywordsCompletions = SqlCompleter.getSqlKeywordsCompletions(jdbcConnection);
            Set<String> dataModelCompletions = SqlCompleter.getDataModelMetadataCompletions(jdbcConnection);
            SetView<String> allCompletions = Sets.union(keywordsCompletions, dataModelCompletions);
            completer = new SqlCompleter(allCompletions, dataModelCompletions);

        } catch (IOException | SQLException e) {
            logger.error("Cannot create SQL completer", e);
        }
        return completer;
    }

}