package com.company;

import java.security.Provider;

public class Main {

    private static final Provider testProvider;
    static {
        testProvider = new Provider("MyProvider", 1.0, "test") {
        };
        testProvider.put("CertificateFactory.Fixed", "MyCertificateFactory");
    }

    private static final int NUMBER_OF_RETRIEVERS = 3;
    private static final int TEST_TIME_MS = 1000;

    public static void main(String[] args) throws InterruptedException {
        Updater updater = new Updater();
        updater.start();
        Retriever [] retrievers = new Retriever[NUMBER_OF_RETRIEVERS];
        for (int i=0; i<retrievers.length; i++) {
            retrievers[i] = new Retriever();
            retrievers[i].start();
        }
        Thread.sleep(TEST_TIME_MS);
        System.out.println("interrupt");
        updater.interrupt();
        updater.join();
        for (int i=0; i<retrievers.length; i++) {
            retrievers[i].interrupt();
            retrievers[i].join();
        }
        System.out.println("done");
    }

    private static class Updater extends Thread {
        @Override
        public void run() {
            while (!isInterrupted()) {
                testProvider.put("CertificateFactory.Added", "MyCertificateFactory");
            }
            System.out.println("Updater stopped");
        }
    }

    private static class Retriever extends Thread {
        @Override
        public void run() {
            while (!isInterrupted()) {
                Provider.Service service = testProvider.getService("CertificateFactory", "Fixed");
                if (service == null) {
                    System.err.println("CertificateFactory.Fixed is NULL");
                } else {
                    //System.out.println("CertificateFactory.Fixed is good");
                }
            }
            System.out.println("Retriever stopped");
        }
    }
}