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.AtomicBoolean;
   8 import java.util.concurrent.atomic.AtomicReference;
   9 import java.util.function.Supplier;
  10
  11 import net.pterodactylus.fcp.ListPeer;
  12 import net.pterodactylus.fcp.Peer;
  13 import net.pterodactylus.fcp.UnknownNodeIdentifier;
  14
  15 import com.google.common.util.concurrent.ListenableFuture;
  16 import com.google.common.util.concurrent.ListeningExecutorService;
  17 import com.google.common.util.concurrent.MoreExecutors;
  18
  19 /**
  20  * Default {@link ListPeerCommand} implementation based on {@link FcpDialog}.
  21  *
  22  * @author <a href="mailto:bombe@freenetproject.org">David ‘Bombe’ Roden</a>
  23  */
  24 public class ListPeerCommandImpl implements ListPeerCommand {
  25
  26         private final ListeningExecutorService threadPool;
  27         private final ConnectionSupplier connectionSupplier;
  28         private final Supplier<String> identifierGenerator;
  29         private final AtomicReference<String> nodeIdentifier = new AtomicReference<>();
  30
  31         public ListPeerCommandImpl(ExecutorService threadPool, ConnectionSupplier connectionSupplier, Supplier<String> identifierGenerator) {
  32                 this.threadPool = MoreExecutors.listeningDecorator(threadPool);
  33                 this.connectionSupplier = connectionSupplier;
  34                 this.identifierGenerator = identifierGenerator;
  35         }
  36
  37         @Override
  38         public Executable<Optional<Peer>> byName(String name) {
  39                 nodeIdentifier.set(name);
  40                 return this::execute;
  41         }
  42
  43         @Override
  44         public Executable<Optional<Peer>> byIdentity(String identity) {
  45                 nodeIdentifier.set(identity);
  46                 return this::execute;
  47         }
  48
  49         @Override
  50         public Executable<Optional<Peer>> byHostAndPort(String host, int port) {
  51                 nodeIdentifier.set(String.format("%s:%d", host, port));
  52                 return this::execute;
  53         }
  54
  55         private ListenableFuture<Optional<Peer>> execute() {
  56                 return threadPool.submit(this::executeDialog);
  57         }
  58
  59         private Optional<Peer> executeDialog() throws IOException, ExecutionException, InterruptedException {
  60                 ListPeer listPeer = new ListPeer(identifierGenerator.get(), nodeIdentifier.get());
  61                 try (ListPeerDialog listPeerDialog = new ListPeerDialog()) {
  62                         return Optional.ofNullable(listPeerDialog.send(listPeer).get());
  63                 }
  64         }
  65
  66         private class ListPeerDialog extends FcpDialog<Peer> {
  67
  68                 private final AtomicBoolean finished = new AtomicBoolean();
  69                 private final AtomicReference<Peer> peer = new AtomicReference<>();
  70
  71                 public ListPeerDialog() throws IOException {
  72                         super(threadPool, connectionSupplier.get());
  73                 }
  74
  75                 @Override
  76                 protected boolean isFinished() {
  77                         return finished.get();
  78                 }
  79
  80                 @Override
  81                 protected Peer getResult() {
  82                         return peer.get();
  83                 }
  84
  85                 @Override
  86                 protected void consumePeer(Peer peer) {
  87                         this.peer.set(peer);
  88                         finished.set(true);
  89                 }
  90
  91                 @Override
  92                 protected void consumeUnknownNodeIdentifier(UnknownNodeIdentifier unknownNodeIdentifier) {
  93                         finished.set(true);
  94                 }
  95
  96         }
  97
  98 }