/**
* Copyright (C) 2009-2013 FoundationDB, LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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/>.
*/
package com.foundationdb.sql.pg;
import com.foundationdb.qp.operator.QueryBindings;
import com.foundationdb.server.service.monitor.SessionMonitor.StatementTypes;
import com.foundationdb.sql.optimizer.plan.CostEstimate;
import com.foundationdb.sql.parser.ParameterNode;
import com.foundationdb.sql.parser.StatementNode;
import java.io.IOException;
import java.util.List;
/**
* Generally trivial handling of session verbs that aren't in the actual SQL grammar.
*/
public class PostgresEmulatedSessionStatement extends PostgresStatementResults
implements PostgresStatement
{
enum Verb {
UNLISTEN("UNLISTEN"),
DISCARD("DISCARD");
private String sql;
Verb(String sql) {
this.sql = sql;
}
public String getSQL() {
return sql;
}
}
private Verb verb;
private String sql;
private long aisGeneration;
protected PostgresEmulatedSessionStatement(Verb verb, String sql) {
this.verb = verb;
this.sql = sql;
}
@Override
public PostgresType[] getParameterTypes() {
return null;
}
@Override
public void sendDescription(PostgresQueryContext context,
boolean always, boolean params)
throws IOException {
if (always) {
PostgresServerSession server = context.getServer();
PostgresMessenger messenger = server.getMessenger();
messenger.beginMessage(PostgresMessages.NO_DATA_TYPE.code());
messenger.sendMessage();
}
}
@Override
public TransactionMode getTransactionMode() {
return TransactionMode.ALLOWED;
}
@Override
public TransactionAbortedMode getTransactionAbortedMode() {
return TransactionAbortedMode.ALLOWED;
}
@Override
public AISGenerationMode getAISGenerationMode() {
return AISGenerationMode.ALLOWED;
}
@Override
public PostgresStatementResult execute(PostgresQueryContext context, QueryBindings bindings, int maxrows) throws IOException {
PostgresServerSession server = context.getServer();
server.getSessionMonitor().countEvent(StatementTypes.OTHER_STMT);
doOperation(context, server);
return commandComplete(verb.getSQL());
}
@Override
public boolean hasAISGeneration() {
return aisGeneration != 0;
}
@Override
public void setAISGeneration(long aisGeneration) {
this.aisGeneration = aisGeneration;
}
@Override
public long getAISGeneration() {
return aisGeneration;
}
@Override
public PostgresStatement finishGenerating(PostgresServerSession server,
String sql, StatementNode stmt,
List<ParameterNode> params, int[] paramTypes) {
return this;
}
@Override
public boolean putInCache() {
return false;
}
@Override
public CostEstimate getCostEstimate() {
return null;
}
protected void doOperation(PostgresQueryContext context, PostgresServerSession server) throws IOException {
switch (verb) {
case UNLISTEN:
default:
break;
}
}
}