Examples with DMLResponseHandler com.actiontech.dble.backend.mysql.nio.handler.query.DMLResponseHandler used on opensource projects

Example 1 with DMLResponseHandler

use of com.actiontech.dble.backend.mysql.nio.handler.query.DMLResponseHandler in project dble by actiontech.

the class BaseHandlerBuilder method build.

/**
 * generate a handler chain
 */
public final void build() {
    List<DMLResponseHandler> preHandlers = null;
    // is use the nest loop join
    boolean isNestLoopJoin = isNestLoopStrategy(node);
    if (isNestLoopJoin) {
        nestLoopBuild();
    } else if (!node.isExistView() && PlanUtil.isGlobal(node) && !node.isSubQuery()) {
        // the query can be send to a certain node
        noShardBuild();
    } else if (canDoAsMerge()) {
        // the query can be send to some certain nodes .eg: ER tables,  GLOBAL*NORMAL GLOBAL*ER
        mergeBuild();
    } else {
        handleSubQueries();
        // need to split to simple query
        preHandlers = buildPre();
        buildOwn();
    }
    if (needCommon) {
        buildCommon();
    }
    // view sub alias
    String tbAlias = node.getAlias();
    String schema = null;
    String table = null;
    if (node.type() == PlanNodeType.TABLE) {
        TableNode tbNode = (TableNode) node;
        schema = tbNode.getSchema();
        table = tbNode.getTableName();
    }
    if (node.type() != PlanNodeType.NONAME) {
        SendMakeHandler sh = new SendMakeHandler(getSequenceId(), session, node.getColumnsSelected(), schema, table, tbAlias);
        addHandler(sh);
    }
    if (preHandlers != null) {
        for (DMLResponseHandler preHandler : preHandlers) {
            preHandler.setNextHandler(start);
        }
    }
}

Example 2 with DMLResponseHandler

use of com.actiontech.dble.backend.mysql.nio.handler.query.DMLResponseHandler in project dble by actiontech.

the class QueryNodeHandlerBuilder method buildPre.

@Override
public List<DMLResponseHandler> buildPre() {
    List<DMLResponseHandler> pres = new ArrayList<>();
    PlanNode subNode = node.getChild();
    BaseHandlerBuilder builder = hBuilder.getBuilder(session, subNode, isExplain);
    if (builder.getSubQueryBuilderList().size() > 0) {
        this.getSubQueryBuilderList().addAll(builder.getSubQueryBuilderList());
    }
    DMLResponseHandler subHandler = builder.getEndHandler();
    pres.add(subHandler);
    return pres;
}

Example 3 with DMLResponseHandler

use of com.actiontech.dble.backend.mysql.nio.handler.query.DMLResponseHandler in project dble by actiontech.

the class MultiNodeMergeHandler method terminatePreHandler.

/**
 * terminatePreHandler
 * @param handler handler
 */
private void terminatePreHandler(DMLResponseHandler handler) {
    DMLResponseHandler current = handler;
    while (current != null) {
        if (current == this)
            break;
        current.terminate();
        current = current.getNextHandler();
    }
}

Example 4 with DMLResponseHandler

use of com.actiontech.dble.backend.mysql.nio.handler.query.DMLResponseHandler in project dble by actiontech.

the class HandlerTool method terminateHandlerTree.

// private static Pattern pat = Pattern.compile("^\'([^\']*?)\'$");
/**
 * @param node
 */
public static void terminateHandlerTree(final DMLResponseHandler node) {
    try {
        if (node == null)
            return;
        List<DMLResponseHandler> merges = node.getMerges();
        for (DMLResponseHandler merge : merges) {
            DMLResponseHandler currentHandler = merge;
            while (currentHandler != node) {
                currentHandler.terminate();
                currentHandler = currentHandler.getNextHandler();
            }
        }
        node.terminate();
    } catch (Exception e) {
        Logger.getLogger(HandlerTool.class).error("terminate node exception:", e);
    }
}

Example 5 with DMLResponseHandler

use of com.actiontech.dble.backend.mysql.nio.handler.query.DMLResponseHandler in project dble by actiontech.

the class ExplainHandler method getAllNodesFromLeaf.

private static String getAllNodesFromLeaf(DMLResponseHandler handler, Map<String, RefHandlerInfo> refMap, Map<DMLResponseHandler, RefHandlerInfo> handlerMap, Map<String, Integer> nameMap) {
    DMLResponseHandler nextHandler = skipSendMake(handler.getNextHandler());
    String rootName = null;
    while (nextHandler != null) {
        RefHandlerInfo child = handlerMap.get(handler);
        String childName = child.name;
        String handlerType = getTypeName(nextHandler);
        if (!handlerMap.containsKey(nextHandler)) {
            String handlerName = genHandlerName(handlerType, nameMap);
            RefHandlerInfo handlerInfo = new RefHandlerInfo(handlerName, handlerType);
            handlerMap.put(nextHandler, handlerInfo);
            refMap.put(handlerName, handlerInfo);
            handlerInfo.addChild(childName);
            rootName = handlerName;
        } else {
            handlerMap.get(nextHandler).addChild(childName);
        }
        if (handler instanceof TempTableHandler) {
            TempTableHandler tmp = (TempTableHandler) handler;
            DMLResponseHandler endHandler = tmp.getCreatedHandler();
            endHandler.setNextHandler(nextHandler);
            buildHandlerTree(endHandler, refMap, handlerMap, nameMap, Collections.singleton(childName + "'s RESULTS"));
        }
        handler = nextHandler;
        nextHandler = skipSendMake(nextHandler.getNextHandler());
    }
    return rootName;
}