85 lines
2.8 KiB
Java
85 lines
2.8 KiB
Java
// understandingcollections/Tester.java
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// (c)2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
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// Applies Test objects to lists of different collections
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import java.util.*;
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import java.time.*;
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public class Tester<C> {
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public static int fieldWidth = 8;
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public static
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TestParam[] defaultParams= TestParam.array(
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10, 5000, 100, 5000, 1000, 5000, 10000, 500);
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// Override this to modify pre-test initialization:
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protected C initialize(int size) { return collection; }
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protected C collection;
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private String headline = "";
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private List<Test<C>> tests;
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private static int sizeWidth = 5;
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private static String sizeField = "%" + sizeWidth + "s";
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private TestParam[] paramList = defaultParams;
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public Tester(C collection, List<Test<C>> tests) {
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this.collection = collection;
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this.tests = tests;
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if(collection != null)
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headline = collection.getClass().getSimpleName();
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}
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public Tester(C collection, List<Test<C>> tests,
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TestParam[] paramList) {
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this(collection, tests);
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this.paramList = paramList;
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}
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public void setHeadline(String newHeadline) {
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headline = newHeadline;
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}
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// Generic methods for convenience :
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public static
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<C> void run(C cntnr, List<Test<C>> tests) {
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new Tester<>(cntnr, tests).timedTest();
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}
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public static <C> void run(C cntnr,
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List<Test<C>> tests, TestParam[] paramList) {
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new Tester<>(cntnr, tests, paramList).timedTest();
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}
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private void displayHeader() {
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// Calculate width and pad with '-':
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int width = fieldWidth * tests.size() + sizeWidth;
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int dashLength = width - headline.length() - 1;
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StringBuilder head = new StringBuilder(width);
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for(int i = 0; i < dashLength/2; i++)
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head.append('-');
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head.append(' ');
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head.append(headline);
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head.append(' ');
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for(int i = 0; i < dashLength/2; i++)
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head.append('-');
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System.out.println(head);
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// Print column headers:
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System.out.format(sizeField, "size");
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for(Test<C> test : tests)
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System.out.format(
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"%" + fieldWidth + "s", test.name);
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System.out.println();
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}
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// Run the tests for this collection:
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public void timedTest() {
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displayHeader();
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for(TestParam param : paramList) {
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System.out.format(sizeField, param.size);
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for(Test<C> test : tests) {
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C kontainer = initialize(param.size);
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Instant start = Instant.now();
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// Call the overriden method:
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int reps = test.test(kontainer, param);
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Duration elapsed =
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Duration.between(start, Instant.now());
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Duration timePerRep = elapsed.dividedBy(reps);
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System.out.format("%" + fieldWidth + "d",
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timePerRep.toNanos());
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}
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System.out.println();
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}
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}
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}
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