Github user wujinhu commented on a diff in the pull request:

    https://github.com/apache/incubator-eagle/pull/705#discussion_r90587141
  
    --- Diff: 
eagle-core/eagle-alert-parent/eagle-alert/alert-metadata-parent/alert-metadata/src/main/java/org/apache/eagle/alert/metadata/impl/JdbcMetadataHandler.java
 ---
    @@ -0,0 +1,533 @@
    +/*
    + * 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.eagle.alert.metadata.impl;
    +
    +import org.apache.commons.collections.map.HashedMap;
    +import org.apache.commons.dbcp.BasicDataSource;
    +import org.apache.eagle.alert.coordination.model.Kafka2TupleMetadata;
    +import org.apache.eagle.alert.coordination.model.ScheduleState;
    +import org.apache.eagle.alert.coordination.model.internal.PolicyAssignment;
    +import org.apache.eagle.alert.coordination.model.internal.Topology;
    +import org.apache.eagle.alert.engine.coordinator.*;
    +import org.apache.eagle.alert.engine.model.AlertPublishEvent;
    +import org.apache.eagle.alert.metadata.MetadataUtils;
    +import org.apache.eagle.alert.metadata.resource.OpResult;
    +
    +import com.fasterxml.jackson.core.JsonProcessingException;
    +import com.fasterxml.jackson.databind.DeserializationFeature;
    +import com.fasterxml.jackson.databind.ObjectMapper;
    +import com.typesafe.config.Config;
    +
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import javax.sql.DataSource;
    +import java.io.IOException;
    +import java.sql.*;
    +import java.util.*;
    +import java.util.function.Function;
    +
    +public class JdbcMetadataHandler {
    +
    +    private static final Logger LOG = 
LoggerFactory.getLogger(JdbcMetadataHandler.class);
    +    // general model
    +    private static final String INSERT_STATEMENT = "INSERT INTO 
%s(content, id) VALUES (?, ?)";
    +    private static final String DELETE_STATEMENT = "DELETE FROM %s WHERE 
id=?";
    +    private static final String UPDATE_STATEMENT = "UPDATE %s set 
content=? WHERE id=?";
    +    private static final String QUERY_ALL_STATEMENT = "SELECT content FROM 
%s";
    +    private static final String QUERY_CONDITION_STATEMENT = "SELECT 
content FROM %s WHERE id=?";
    +    private static final String QUERY_ORDERBY_STATEMENT = "SELECT content 
FROM %s ORDER BY id %s";
    +
    +    // customized model
    +    private static final String CLEAR_SCHEDULESTATES_STATEMENT = "DELETE 
FROM schedule_state WHERE id NOT IN (SELECT id from (SELECT id FROM 
schedule_state ORDER BY id DESC limit ?) as states)";
    +    private static final String INSERT_ALERT_STATEMENT = "INSERT INTO 
alert_event(alertId, siteId, appIds, policyId, alertTimestamp, policyValue, 
alertData) VALUES (?, ?, ?, ?, ?, ?, ?)";
    +    private static final String QUERY_ALERT_STATEMENT = "SELECT * FROM 
alert_event order by alertTimestamp DESC limit ?";
    +    private static final String QUERY_ALERT_BY_ID_STATEMENT = "SELECT * 
FROM alert_event WHERE alertId=? order by alertTimestamp DESC limit ?";
    +    private static final String QUERY_ALERT_BY_POLICY_STATEMENT = "SELECT 
* FROM alert_event WHERE policyId=? order by alertTimestamp DESC limit ?";
    +    private static final String INSERT_POLICYPUBLISHMENT_STATEMENT = 
"INSERT INTO policy_publishment(policyId, publishmentName) VALUES (?, ?)";
    +    private static final String DELETE_PUBLISHMENT_STATEMENT = "DELETE 
FROM policy_publishment WHERE policyId=?";
    +    private static final String QUERY_PUBLISHMENT_BY_POLICY_STATEMENT = 
"SELECT content FROM publishment a INNER JOIN policy_publishment b ON 
a.id=b.publishmentName and b.policyId=?";
    +    private static final String QUERY_PUBLISHMENT_STATEMENT = "SELECT 
a.content, b.policyId FROM publishment a LEFT JOIN policy_publishment b ON 
a.id=b.publishmentName";
    +
    +    public enum SortType { DESC, ASC }
    +
    +    private static Map<String, String> tblNameMap = new HashMap<>();
    +
    +    private static final ObjectMapper mapper = new ObjectMapper();
    +    private DataSource dataSource;
    +
    +    static {
    +        
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    +        registerTableName(StreamingCluster.class.getSimpleName(), 
"stream_cluster");
    +        registerTableName(StreamDefinition.class.getSimpleName(), 
"stream_definition");
    +        registerTableName(Kafka2TupleMetadata.class.getSimpleName(), 
"kafka_tuple_metadata");
    +        registerTableName(PolicyDefinition.class.getSimpleName(), 
"policy_definition");
    +        registerTableName(Publishment.class.getSimpleName(), 
"publishment");
    +        registerTableName(PublishmentType.class.getSimpleName(), 
"publishment_type");
    +        registerTableName(ScheduleState.class.getSimpleName(), 
"schedule_state");
    +        registerTableName(PolicyAssignment.class.getSimpleName(), 
"policy_assignment");
    +        registerTableName(Topology.class.getSimpleName(), "topology");
    +        registerTableName(AlertPublishEvent.class.getSimpleName(), 
"alert_event");
    +    }
    +
    +    private static void registerTableName(String clzName, String tblName) {
    +        tblNameMap.put(clzName, tblName);
    +    }
    +
    +    public JdbcMetadataHandler(Config config) {
    +        try {
    +            //JdbcSchemaManager.getInstance().init(config);
    +            BasicDataSource bDatasource = new BasicDataSource();
    +            
bDatasource.setDriverClassName(config.getString(MetadataUtils.JDBC_DRIVER_PATH));
    +            if (config.hasPath(MetadataUtils.JDBC_USERNAME_PATH)) {
    +                
bDatasource.setUsername(config.getString(MetadataUtils.JDBC_USERNAME_PATH));
    +                
bDatasource.setPassword(config.getString(MetadataUtils.JDBC_PASSWORD_PATH));
    +            }
    +            
bDatasource.setUrl(config.getString(MetadataUtils.JDBC_CONNECTION_PATH));
    +            if 
(config.hasPath(MetadataUtils.JDBC_CONNECTION_PROPERTIES_PATH)) {
    +                
bDatasource.setConnectionProperties(config.getString(MetadataUtils.JDBC_CONNECTION_PROPERTIES_PATH));
    +            }
    +            this.dataSource = bDatasource;
    +        } catch (Exception e) {
    +            LOG.error(e.getMessage(), e);
    +        }
    +    }
    +
    +    private String getTableName(String clzName) {
    +        String tbl = tblNameMap.get(clzName);
    +        if (tbl != null) {
    +            return tbl;
    +        } else {
    +            return clzName;
    +        }
    +    }
    +
    +    private OpResult executeUpdate(Connection connection, String query, 
String key, String value) throws SQLException {
    +        OpResult result = new OpResult();
    +        PreparedStatement statement = null;
    +        try {
    +            statement = connection.prepareStatement(query);
    +            Clob clob = connection.createClob();
    +            clob.setString(1, value);
    +            statement.setClob(1, clob);
    +            statement.setString(2, key);
    +            int status = statement.executeUpdate();
    +            LOG.info("update {} with query={}", status, query);
    +        } finally {
    +            if (statement != null) {
    +                statement.close();
    +            }
    --- End diff --
    
    close connection


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