io.questdb.griffin.engine.functions.rnd.RndLogFunctionFactory Maven / Gradle / Ivy

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2022 QuestDB
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 *  Licensed 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
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 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
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package io.questdb.griffin.engine.functions.rnd;

import io.questdb.cairo.CairoConfiguration;
import io.questdb.cairo.sql.Function;
import io.questdb.cairo.sql.Record;
import io.questdb.cairo.sql.SymbolTableSource;
import io.questdb.griffin.FunctionFactory;
import io.questdb.griffin.SqlException;
import io.questdb.griffin.SqlExecutionContext;
import io.questdb.griffin.engine.functions.BooleanFunction;
import io.questdb.log.Log;
import io.questdb.log.LogFactory;
import io.questdb.log.LogRecord;
import io.questdb.std.IntList;
import io.questdb.std.ObjList;
import io.questdb.std.Rnd;

public class RndLogFunctionFactory implements FunctionFactory {
    private static final Log LOG = LogFactory.getLog(RndLogFunctionFactory.class);

    @Override
    public String getSignature() {
        return "rnd_log(ld)";
    }

    @Override
    public Function newInstance(int position, ObjList args, IntList argPositions, CairoConfiguration configuration, SqlExecutionContext sqlExecutionContext) throws SqlException {
        return new TestLogFunction(
                args.getQuick(0).getLong(null),
                args.getQuick(1).getDouble(null) % 100d
        );
    }

    private static class TestLogFunction extends BooleanFunction {
        private final long totalLogLines;
        private final double errorRatio; // error log percentage from the total log lines
        private Rnd rnd;

        public TestLogFunction(long totalLogLines, double errorRatio) {
            this.totalLogLines = totalLogLines;
            this.errorRatio = errorRatio;
        }

        @Override
        public boolean getBool(Record rec) {
            for (long l = 0; l < totalLogLines; l++) {
                final LogRecord log;

                if (rnd.nextDouble() * 10000 < errorRatio * 100) {
                    log = LOG.error();
                } else {
                    log = LOG.info();
                }

                log.$(rnd.nextString(25)).$();
            }
            return true;
        }

        @Override
        public boolean isReadThreadSafe() {
            return false;
        }

        @Override
        public void init(SymbolTableSource symbolTableSource, SqlExecutionContext executionContext) throws SqlException {
            this.rnd = executionContext.getRandom();
        }
    }
}