/*

 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

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 */

/*

 * @test

 * @bug 8184765

 * @summary make sure the SystemDictionary gets resized when load factor is too high

 * @library /test/lib

 * @modules java.base/jdk.internal.misc

 *          java.management

 * @compile TriggerResize.java

 * @run driver TestResize

 */

import java.lang.ProcessBuilder;

import java.lang.Process;

import jdk.test.lib.process.ProcessTools;

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.util.Scanner;

public class TestResize {

  static double MAX_LOAD_FACTOR = 5.0; // see _resize_load_trigger in dictionary.cpp

  static int getInt(String string) {

    int start = 0;

    for (int i = 0; i < string.length(); i++) {

      if (!Character.isDigit(string.charAt(i))) {

        start++;

      } else {

        break;

      }

    }

    int end = start;

    for (int i = end; i < string.length(); i++) {

      if (Character.isDigit(string.charAt(i))) {

        end++;

      } else {

        break;

      }

    }

    return Integer.parseInt(string.substring(start, end));

  }

  static void analyzeOutputOn(ProcessBuilder pb) throws Exception {

    pb.redirectErrorStream(true);

    Process process = pb.start();

    BufferedReader rd = new BufferedReader(new InputStreamReader(process.getInputStream()));

    String line = rd.readLine();

    while (line != null) {

      if (line.startsWith("Java dictionary (")) {

        // ex. "Java dictionary (table_size=107, classes=6)"

        // ex. "Java dictionary (table_size=20201, classes=50002)"

        Scanner scanner = new Scanner(line);

        scanner.next();

        scanner.next();

        int table_size = getInt(scanner.next());

        int classes = getInt(scanner.next());

        scanner.close();

        double loadFactor = (double)classes / (double)table_size;

        if (loadFactor > MAX_LOAD_FACTOR) {

          throw new RuntimeException("Load factor too high, expected MAX "+MAX_LOAD_FACTOR+", got "+loadFactor);

        } else {

          System.out.println("PASS table_size:"+table_size+", classes:"+classes+" OK");

        }

      }

      line = rd.readLine();

    }

    int retval = process.waitFor();

    if (retval != 0) {

      throw new RuntimeException("Error: test returned non-zero value");

    }

  }

  public static void main(String[] args) throws Exception {

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+PrintSystemDictionaryAtExit",

                                                              "TriggerResize",

                                                              "50000");

    analyzeOutputOn(pb);

  }

}