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BitTorrent Client Library (Core)

There is a newer version: 1.10

package bt;

import bt.runtime.BtClient;
import bt.torrent.TorrentSession;
import bt.torrent.TorrentSessionState;

import java.util.concurrent.CompletableFuture;
import java.util.function.Consumer;
import java.util.function.Supplier;

/**
 * Client decorator with lazy (on-demand) initialization.
 *
 * @since 1.0
 */
class LazyClient implements BtClient {

    private Supplier clientSupplier;
    private volatile BtClient delegate;

    /**
     * @since 1.0
     */
    public LazyClient(Supplier clientSupplier) {
        this.clientSupplier = clientSupplier;
    }

    private synchronized void initClient() {
        if (delegate == null) {
            delegate = clientSupplier.get();
        }
    }

    @Override
    public CompletableFuture startAsync() {
        if (delegate == null) {
            initClient();
        }
        return delegate.startAsync();
    }

    @Override
    public CompletableFuture startAsync(Consumer listener, long period) {
        if (delegate == null) {
            initClient();
        }
        return delegate.startAsync(listener, period);
    }

    @Override
    public void stop() {
        if (delegate == null) {
            return;
        }
        delegate.stop();
    }

    @Override
    public TorrentSession getSession() {
        if (delegate == null) {
            initClient();
        }
        return delegate.getSession();
    }

    @Override
    public boolean isStarted() {
        return delegate != null && delegate.isStarted();
    }
}