net.java.truecommons.key.spec.prompting.SharedKeyManager Maven / Gradle / Ivy

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Specifies a pluggable API for key management.

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/*
 * Copyright (C) 2005-2015 Schlichtherle IT Services.
 * All rights reserved. Use is subject to license terms.
 */
package net.java.truecommons.key.spec.prompting;

import net.java.truecommons.shed.Option;
import net.java.truecommons.shed.UniqueObject;

import javax.annotation.concurrent.ThreadSafe;
import java.net.URI;
import java.util.HashMap;
import java.util.Map;

import static net.java.truecommons.shed.Option.apply;

/**
 * @param   the type of the prompting keys.
 * @since  TrueCommons 2.2
 * @author Christian Schlichtherle
 */
@SuppressWarnings("LoopStatementThatDoesntLoop")
@ThreadSafe
final class SharedKeyManager>
extends UniqueObject {

    private final Map> providers = new HashMap<>();

    private Option> get(URI uri) {
        return apply(providers.get(uri));
    }

    private Option> put(URI uri, SharedKeyProvider p) {
        return apply(providers.put(uri, p));
    }

    private Option> remove(URI uri) {
        return apply(providers.remove(uri));
    }

    synchronized SharedKeyProvider provider(final URI uri) {
        for (final SharedKeyProvider p : get(uri))
            return p;
        final SharedKeyProvider p = new SharedKeyProvider();
        put(uri, p);
        p.link();
        return p;
    }

    synchronized void release(final URI uri) {
        for (final SharedKeyProvider p : get(uri))
            p.release();
    }

    synchronized void link(final URI originUri, final URI targetUri) {
        for (final SharedKeyProvider originProvider : get(originUri)) {
            for (final SharedKeyProvider targetProvider : put(targetUri, originProvider)) {
                if (targetProvider == originProvider)
                    return;
                targetProvider.unlink();
            }
            originProvider.link();
        }
    }

    synchronized void unlink(final URI uri) {
        for (final SharedKeyProvider p : remove(uri))
            p.unlink();
    }
}