package com.tesora.dve.server.messaging;

/*
 * #%L
 * Tesora Inc.
 * Database Virtualization Engine
 * %%
 * Copyright (C) 2011 - 2014 Tesora Inc.
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 * #L%
 */


import com.tesora.dve.concurrent.CompletionHandle;
import com.tesora.dve.common.catalog.PersistentDatabase;
import com.tesora.dve.comms.client.messages.MessageType;
import com.tesora.dve.comms.client.messages.MessageVersion;
import com.tesora.dve.server.connectionmanager.SSContext;
import com.tesora.dve.server.statistics.SiteStatKey.OperationClass;
import com.tesora.dve.server.statistics.manager.LogSiteStatisticRequest;
import com.tesora.dve.worker.Worker;

public class WorkerExecuteRequest extends WorkerRequest {
	private static final long serialVersionUID = 1L;

	PersistentDatabase defaultDatabase;
	final SQLCommand command;

	public WorkerExecuteRequest(SSContext ssContext, SQLCommand command) {
		super(ssContext);
		this.command = command;
	}
	
	public WorkerExecuteRequest onDatabase(PersistentDatabase database) {
		defaultDatabase = database;
		return this;
	}
	
	@Override
	public void executeRequest(Worker w, CompletionHandle<Boolean> promise) {
		executeStatement(w, getCommand(), promise);
	}
	
	protected void executeStatement(final Worker w, final SQLCommand stmtCommand, final CompletionHandle<Boolean> callersResult) {

        try {
            w.setCurrentDatabase(defaultDatabase);

            // do any late resolution

            if (isAutoTransact())
                w.startTrans(getTransId());

            this.execute(w, stmtCommand, callersResult);
		} catch (Exception pe) {
			callersResult.failure(pe);
		}
	}

    @Override
	public String toString() {
		return new StringBuffer().append("WorkerExecuteRequest("+getCommand()+")").toString();
	}

	public SQLCommand getCommand() {
		return command;
	}

	@Override
	public MessageType getMessageType() {
		return MessageType.W_EXECUTE_REQUEST;
	}

	@Override
	public MessageVersion getVersion() {
		return MessageVersion.VERSION1;
	}


	@Override
	public LogSiteStatisticRequest getStatisticsNotice() {
		return new LogSiteStatisticRequest(OperationClass.EXECUTE);
	}
}