97 lines
3.7 KiB
Java
97 lines
3.7 KiB
Java
package org.warp.jcwdb.exampleimpl;
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import org.warp.jcwdb.EntryReference;
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import org.warp.jcwdb.JCWDatabase;
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import org.warp.jcwdb.LightList;
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import it.unimi.dsi.fastutil.objects.ObjectArrayList;
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import it.unimi.dsi.fastutil.objects.ObjectList;
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import java.nio.file.Files;
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import java.nio.file.Paths;
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import java.util.function.Predicate;
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public class App {
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public static void main(String[] args) {
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try {
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if (args.length > 2 && Boolean.parseBoolean(args[2])) {
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Files.delete(Paths.get(args[0]));
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Files.delete(Paths.get(args[1]));
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}
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System.out.println("Loading database...");
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long time0 = System.currentTimeMillis();
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JCWDatabase db = new JCWDatabase(Paths.get(args[0]), Paths.get(args[1]));
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try {
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long time01 = System.currentTimeMillis();
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System.out.println("Time elapsed: " + (time01 - time0));
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System.out.println("Loading root...");
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EntryReference<LightList<Animal>> rootRef = db.getRoot(Animal.class);
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LightList<Animal> root = rootRef.getValue();
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long time1 = System.currentTimeMillis();
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System.out.println("Time elapsed: " + (time1 - time01));
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System.out.println("Root size: " + root.size());
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System.out.println("Root:");
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// for (int i = 0; i < root.size(); i++) {
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// System.out.println(" - " + root.get(i));
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// }
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long prectime = System.currentTimeMillis();
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for (int i = 0; i < 2000000/* 2000000 */; i++) {
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Animal animal = new StrangeAnimal(i % 40);
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root.add(animal);
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if (i > 0 && i % 200000 == 0) {
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long precprectime = prectime;
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prectime = System.currentTimeMillis();
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System.out.println("Element " + i + " (" + (prectime - precprectime) + "ms)");
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}
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}
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long time2 = System.currentTimeMillis();
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System.out.println("Root size: " + root.size());
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System.out.println("Time elapsed: " + (time2 - time1));
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System.out.println("Used memory: "
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+ ((Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1024 / 1024) + "MB");
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long time2_0 = System.currentTimeMillis();
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System.out.println("Filtering strings...");
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//root.removeIf(Animal::hasFourLegs);
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long time2_1 = System.currentTimeMillis();
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System.out.println("Time elapsed: " + (time2_1 - time2_0));
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ObjectList<Animal> results = new ObjectArrayList<>();
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root.forEach((value) -> {
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if (Animal.hasFourLegs(value)) {
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results.add(value);
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}
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//System.out.println("val:" + value);
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});
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long time2_2 = System.currentTimeMillis();
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System.out.println("Time elapsed: " + (time2_2 - time2_1));
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System.out.println("Used memory: "
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+ ((Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1024 / 1024) + "MB");
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System.out.println("Used memory: " + ((Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1024 / 1024) + "MB");
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System.out.println("Cleaning database (to reduce the amount of used memory and detect memory leaks)...");
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long removedItems = db.clean();
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long time3 = System.currentTimeMillis();
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System.out.println("Removed items: " + removedItems);
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System.out.println("Used memory: " + ((Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1024 / 1024) + "MB");
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System.out.println("Time elapsed: " + (time3 - time2_2));
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System.out.println("Saving database...");
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System.out.println("Root size: " + root.size());
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db.close();
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long time4 = System.currentTimeMillis();
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System.out.println("Time elapsed: " + (time4 - time3));
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} catch (Exception ex) {
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ex.printStackTrace();
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} finally {
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if (db.isOpen()) {
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db.close();
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}
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}
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} catch (Exception ex) {
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ex.printStackTrace();
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}
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}
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public static <T> Predicate<T> not(Predicate<T> t) {
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return t.negate();
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}
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}
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