src/main/java/net/pterodactylus/fcp/quelaton/ListPeerCommandImpl.java

   1 package net.pterodactylus.fcp.quelaton;
   2
   3 import java.io.IOException;
   4 import java.util.Optional;
   5 import java.util.concurrent.ExecutionException;
   6 import java.util.concurrent.ExecutorService;
   7 import java.util.concurrent.atomic.AtomicReference;
   8 import java.util.function.Supplier;
   9
  10 import net.pterodactylus.fcp.ListPeer;
  11 import net.pterodactylus.fcp.Peer;
  12 import net.pterodactylus.fcp.UnknownNodeIdentifier;
  13
  14 import com.google.common.util.concurrent.ListenableFuture;
  15 import com.google.common.util.concurrent.ListeningExecutorService;
  16 import com.google.common.util.concurrent.MoreExecutors;
  17
  18 /**
  19  * Default {@link ListPeerCommand} implementation based on {@link FcpDialog}.
  20  *
  21  * @author <a href="mailto:bombe@freenetproject.org">David ‘Bombe’ Roden</a>
  22  */
  23 public class ListPeerCommandImpl implements ListPeerCommand {
  24
  25         private final ListeningExecutorService threadPool;
  26         private final ConnectionSupplier connectionSupplier;
  27         private final Supplier<String> identifierGenerator;
  28         private final AtomicReference<String> nodeIdentifier = new AtomicReference<>();
  29
  30         public ListPeerCommandImpl(ExecutorService threadPool, ConnectionSupplier connectionSupplier, Supplier<String> identifierGenerator) {
  31                 this.threadPool = MoreExecutors.listeningDecorator(threadPool);
  32                 this.connectionSupplier = connectionSupplier;
  33                 this.identifierGenerator = identifierGenerator;
  34         }
  35
  36         @Override
  37         public Executable<Optional<Peer>> byName(String name) {
  38                 nodeIdentifier.set(name);
  39                 return this::execute;
  40         }
  41
  42         @Override
  43         public Executable<Optional<Peer>> byIdentity(String identity) {
  44                 nodeIdentifier.set(identity);
  45                 return this::execute;
  46         }
  47
  48         @Override
  49         public Executable<Optional<Peer>> byHostAndPort(String host, int port) {
  50                 nodeIdentifier.set(String.format("%s:%d", host, port));
  51                 return this::execute;
  52         }
  53
  54         private ListenableFuture<Optional<Peer>> execute() {
  55                 return threadPool.submit(this::executeDialog);
  56         }
  57
  58         private Optional<Peer> executeDialog() throws IOException, ExecutionException, InterruptedException {
  59                 ListPeer listPeer = new ListPeer(identifierGenerator.get(), nodeIdentifier.get());
  60                 try (ListPeerDialog listPeerDialog = new ListPeerDialog()) {
  61                         return Optional.ofNullable(listPeerDialog.send(listPeer).get());
  62                 }
  63         }
  64
  65         private class ListPeerDialog extends FcpDialog<Peer> {
  66
  67                 public ListPeerDialog() throws IOException {
  68                         super(threadPool, connectionSupplier.get(), null);
  69                 }
  70
  71                 @Override
  72                 protected void consumePeer(Peer peer) {
  73                         setResult(peer);
  74                 }
  75
  76                 @Override
  77                 protected void consumeUnknownNodeIdentifier(UnknownNodeIdentifier unknownNodeIdentifier) {
  78                         finish();
  79                 }
  80
  81         }
  82
  83 }