src/main/java/net/pterodactylus/fcp/quelaton/SubscribeUskCommandImpl.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
  10 import net.pterodactylus.fcp.IdentifierCollision;
  11 import net.pterodactylus.fcp.SubscribeUSK;
  12 import net.pterodactylus.fcp.SubscribedUSK;
  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 SubscribeUskCommand} implementation based on {@link FcpDialog}.
  20  *
  21  * @author <a href="mailto:bombe@freenetproject.org">David ‘Bombe’ Roden</a>
  22  */
  23 public class SubscribeUskCommandImpl implements SubscribeUskCommand {
  24
  25         private static final RandomIdentifierGenerator IDENTIFIER = new RandomIdentifierGenerator();
  26         private final ListeningExecutorService threadPool;
  27         private final ConnectionSupplier connectionSupplier;
  28         private final SubscribeUSK subscribeUSK = new SubscribeUSK(IDENTIFIER.generate());
  29
  30         public SubscribeUskCommandImpl(ExecutorService threadPool, ConnectionSupplier connectionSupplier) {
  31                 this.threadPool = MoreExecutors.listeningDecorator(threadPool);
  32                 this.connectionSupplier = connectionSupplier;
  33         }
  34
  35         @Override
  36         public Executable<Optional<UskSubscription>> uri(String uri) {
  37                 subscribeUSK.setUri(uri);
  38                 return this::execute;
  39         }
  40
  41         private ListenableFuture<Optional<UskSubscription>> execute() {
  42                 return threadPool.submit(this::executeDialog);
  43         }
  44
  45         private Optional<UskSubscription> executeDialog() throws IOException, ExecutionException, InterruptedException {
  46                 try (SubscribeUskDialog subscribeUskDialog = new SubscribeUskDialog()) {
  47                         return subscribeUskDialog.send(subscribeUSK).get();
  48                 }
  49         }
  50
  51         private class SubscribeUskDialog extends FcpDialog<Optional<UskSubscription>> {
  52
  53                 private final AtomicBoolean finished = new AtomicBoolean();
  54                 private final AtomicReference<SubscribedUSK> subscribedUSK = new AtomicReference<>();
  55
  56                 public SubscribeUskDialog() throws IOException {
  57                         super(threadPool, connectionSupplier.get());
  58                 }
  59
  60                 @Override
  61                 protected boolean isFinished() {
  62                         return finished.get();
  63                 }
  64
  65                 @Override
  66                 protected Optional<UskSubscription> getResult() {
  67                         return Optional.ofNullable(subscribedUSK.get()).map(subscribedUSK -> new UskSubscription() {
  68                                 @Override
  69                                 public String getUri() {
  70                                         return subscribedUSK.getURI();
  71                                 }
  72                         });
  73                 }
  74
  75                 @Override
  76                 protected void consumeSubscribedUSK(SubscribedUSK subscribedUSK) {
  77                         this.subscribedUSK.set(subscribedUSK);
  78                         finished.set(true);
  79                 }
  80
  81                 @Override
  82                 protected void consumeIdentifierCollision(IdentifierCollision identifierCollision) {
  83                         finished.set(true);
  84                 }
  85
  86         }
  87
  88 }