gobblin.compaction.hive.HiveTable.java Source code

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Here is the source code for gobblin.compaction.hive.HiveTable.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 gobblin.compaction.hive;

import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.UUID;

import org.apache.commons.lang.StringUtils;

import com.google.common.base.Splitter;

import gobblin.util.HiveJdbcConnector;

/**
 * A class for managing general Hive tables.
 */
public abstract class HiveTable {

    protected static final String DROP_TABLE_STMT = "DROP TABLE IF EXISTS %1$s";

    protected final String name;
    protected List<String> primaryKeys;
    protected List<HiveAttribute> attributes;

    public static class Builder<T extends Builder<?>> {
        protected String name = UUID.randomUUID().toString().replaceAll("-", "_");
        protected List<String> primaryKeys = new ArrayList<>();
        protected List<HiveAttribute> attributes = new ArrayList<>();

        @SuppressWarnings("unchecked")
        public T withName(String name) {
            if (StringUtils.isNotBlank(name)) {
                this.name = name;
            }
            return (T) this;
        }

        @SuppressWarnings("unchecked")
        public T withPrimaryKeys(List<String> primaryKeys) {
            this.primaryKeys = primaryKeys;
            return (T) this;
        }

        @SuppressWarnings("unchecked")
        public T withPrimaryKeys(String keyAttrs) {
            List<String> keyAttrsList = Splitter.on(",").trimResults().omitEmptyStrings().splitToList(keyAttrs);
            this.primaryKeys.addAll(keyAttrsList);
            return (T) this;
        }

        @SuppressWarnings("unchecked")
        public T withAttributes(List<HiveAttribute> attributes) {
            this.attributes = attributes;
            return (T) this;
        }
    }

    protected HiveTable(HiveTable.Builder<?> builder) {
        this.name = builder.name;
        this.primaryKeys = Collections.unmodifiableList(builder.primaryKeys);
        this.attributes = Collections.unmodifiableList(builder.attributes);
    }

    public String getName() {
        return this.name;
    }

    public List<String> getPrimaryKeys() {
        return this.primaryKeys;
    }

    public List<HiveAttribute> getAttributes() {
        return this.attributes;
    }

    public void dropTable(HiveJdbcConnector conn, String jobId) throws SQLException {
        String dropTableStmt = String.format(DROP_TABLE_STMT, getNameWithJobId(jobId));
        conn.executeStatements(dropTableStmt);
    }

    protected String getNameWithJobId(String randomSuffix) {
        return this.name + "_" + randomSuffix;
    }

    protected boolean hasNoNewColumn(HiveTable table) {
        for (HiveAttribute attribute : table.attributes) {
            if (!this.attributes.contains(attribute)) {
                return false;
            }
        }
        return true;
    }

    public abstract void createTable(HiveJdbcConnector conn, String randomTableSuffix) throws SQLException;

    public abstract HiveTable addNewColumnsInSchema(HiveJdbcConnector conn, HiveTable table, String randomSuffix)
            throws SQLException;
}