com.github.javaclub.cdl.client.matrix.jdbc.SMatrixStatement Maven / Gradle / Ivy

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package com.github.javaclub.cdl.client.matrix.jdbc;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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

import lombok.Getter;
import lombok.Setter;
import lombok.AccessLevel;

import com.github.javaclub.cdl.client.matrix.executor.StatementExecutor;
import com.github.javaclub.cdl.client.matrix.jdbc.adapter.AbstractStatementAdapter;
import com.github.javaclub.cdl.client.matrix.merger.ResultSetFactory;
import com.github.javaclub.cdl.client.matrix.parser.result.merger.MergeContext;
import com.github.javaclub.cdl.client.matrix.router.SQLExecutionUnit;
import com.github.javaclub.cdl.client.matrix.router.SQLRouteEngine;
import com.github.javaclub.cdl.client.matrix.router.SQLRouteResult;
import com.google.common.base.Charsets;
import com.google.common.hash.HashCode;
import com.google.common.hash.Hashing;

public class SMatrixStatement extends AbstractStatementAdapter {
	private static final Logger log = LoggerFactory.getLogger(SMatrixStatement.class);
	@Getter(AccessLevel.PROTECTED)
    private final SMatrixConnection shardingConnection;
    
    @Getter(AccessLevel.PROTECTED)
    private final SQLRouteEngine sqlRouteEngine;
    
    @Getter
    private final int resultSetType;
    
    @Getter
    private final int resultSetConcurrency;
    
    @Getter
    private final int resultSetHoldability;
    
    private final Map cachedRoutedStatements = new HashMap<>();
    
    @Getter(AccessLevel.PROTECTED)
    @Setter(AccessLevel.PROTECTED)
    private MergeContext mergeContext;
    
    @Getter(AccessLevel.PROTECTED)
    @Setter(AccessLevel.PROTECTED)
    private ResultSet currentResultSet;
    
    public SMatrixStatement(final SQLRouteEngine sqlRouteEngine, final SMatrixConnection shardingConnection) throws SQLException {
        this(sqlRouteEngine, shardingConnection, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT);
    }
    
    public SMatrixStatement(final SQLRouteEngine sqlRouteEngine, final SMatrixConnection shardingConnection, final int resultSetType, final int resultSetConcurrency) throws SQLException {
        this(sqlRouteEngine, shardingConnection, resultSetType, resultSetConcurrency, ResultSet.HOLD_CURSORS_OVER_COMMIT);
    }
    
    public SMatrixStatement(final SQLRouteEngine sqlRouteEngine, final SMatrixConnection shardingConnection, 
            final int resultSetType, final int resultSetConcurrency, final int resultSetHoldability) throws SQLException {
        super(Statement.class);
        this.shardingConnection = shardingConnection;
        this.sqlRouteEngine = sqlRouteEngine;
        this.resultSetType = resultSetType;
        this.resultSetConcurrency = resultSetConcurrency;
        this.resultSetHoldability = resultSetHoldability;
    }
    
    @Override
    public Connection getConnection() throws SQLException {
        return shardingConnection;
    }
    
    @Override
    public ResultSet executeQuery(final String sql) throws SQLException {
        if (null != currentResultSet && !currentResultSet.isClosed()) {
            currentResultSet.close();
        }
        currentResultSet = ResultSetFactory.getResultSet(generateExecutor(sql).executeQuery(), mergeContext);
        return currentResultSet;
    }
    
    @Override
    public int executeUpdate(final String sql) throws SQLException {
        return generateExecutor(sql).executeUpdate();
    }
    
    @Override
    public int executeUpdate(final String sql, final int autoGeneratedKeys) throws SQLException {
        return generateExecutor(sql).executeUpdate(autoGeneratedKeys);
    }
    
    @Override
    public int executeUpdate(final String sql, final int[] columnIndexes) throws SQLException {
        return generateExecutor(sql).executeUpdate(columnIndexes);
    }
    
    @Override
    public int executeUpdate(final String sql, final String[] columnNames) throws SQLException {
        return generateExecutor(sql).executeUpdate(columnNames);
    }
    
    @Override
    public boolean execute(final String sql) throws SQLException {
        return generateExecutor(sql).execute();
    }
    
    @Override
    public boolean execute(final String sql, final int autoGeneratedKeys) throws SQLException {
        return generateExecutor(sql).execute(autoGeneratedKeys);
    }
    
    @Override
    public boolean execute(final String sql, final int[] columnIndexes) throws SQLException {
        return generateExecutor(sql).execute(columnIndexes);
    }
    
    @Override
    public boolean execute(final String sql, final String[] columnNames) throws SQLException {
        return generateExecutor(sql).execute(columnNames);
    }
    
    private StatementExecutor generateExecutor(final String sql) throws SQLException {
        StatementExecutor result = new StatementExecutor();
        SQLRouteResult sqlRouteResult = sqlRouteEngine.route(sql, Collections.emptyList());
        if(sqlRouteResult.isNotShardTable()){
        	setNotShard(true);
        }
		log.debug("route size:{}  {}", sqlRouteResult.getExecutionUnits().size(), sql);
        mergeContext = sqlRouteResult.getMergeContext();
        for (SQLExecutionUnit each : sqlRouteResult.getExecutionUnits()) {
			log.debug("one route:{},{}", each.getGroupName(), each.getSql());
            result.addStatement(each.getSql(), generateStatement(each.getSql(), each.getGroupName()));
        }
        return result;
    }
    
    private Statement generateStatement(final String sql, final String dataSourceName) throws SQLException {
        HashCode hashCode =  Hashing.md5().newHasher().putString(sql, Charsets.UTF_8).putString(dataSourceName, Charsets.UTF_8).hash();
        if (cachedRoutedStatements.containsKey(hashCode)) {
            return cachedRoutedStatements.get(hashCode);
        }
        Connection connection = shardingConnection.getConnection(dataSourceName);
        Statement result;
        if (0 == resultSetHoldability) {
            result = connection.createStatement(resultSetType, resultSetConcurrency);
        } else {
            result = connection.createStatement(resultSetType, resultSetConcurrency, resultSetHoldability);
        }
        replayMethodsInvovation(result);
        cachedRoutedStatements.put(hashCode, result);
        return result;
    }
    
    @Override
    public ResultSet getResultSet() throws SQLException {
        if (null != currentResultSet) {
            return currentResultSet;
        }
        List resultSets = new ArrayList<>(getRoutedStatements().size());
        for (Statement each : getRoutedStatements()) {
            resultSets.add(each.getResultSet());
        }
        currentResultSet = ResultSetFactory.getResultSet(resultSets, mergeContext);
        return currentResultSet;
    }
    
    @Override
    public Collection getRoutedStatements() throws SQLException {
        return cachedRoutedStatements.values();
    }

}