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

   1 package net.pterodactylus.fcp.quelaton;
   2
   3 import java.io.IOException;
   4 import java.util.concurrent.ExecutionException;
   5 import java.util.concurrent.ExecutorService;
   6 import java.util.concurrent.atomic.AtomicBoolean;
   7 import java.util.concurrent.atomic.AtomicReference;
   8
   9 import net.pterodactylus.fcp.PeerRemoved;
  10 import net.pterodactylus.fcp.RemovePeer;
  11 import net.pterodactylus.fcp.UnknownNodeIdentifier;
  12
  13 import com.google.common.util.concurrent.ListenableFuture;
  14 import com.google.common.util.concurrent.ListeningExecutorService;
  15 import com.google.common.util.concurrent.MoreExecutors;
  16
  17 /**
  18  * Default {@link RemovePeerCommand} implementation based on {@link FcpDialog}.
  19  *
  20  * @author <a href="mailto:bombe@freenetproject.org">David ‘Bombe’ Roden</a>
  21  */
  22 public class RemovePeerCommandImpl implements RemovePeerCommand {
  23
  24         private final ListeningExecutorService threadPool;
  25         private final ConnectionSupplier connectionSupplier;
  26         private final AtomicReference<String> nodeIdentifier = new AtomicReference<>();
  27
  28         public RemovePeerCommandImpl(ExecutorService threadPool, ConnectionSupplier connectionSupplier) {
  29                 this.threadPool = MoreExecutors.listeningDecorator(threadPool);
  30                 this.connectionSupplier = connectionSupplier;
  31         }
  32
  33         @Override
  34         public Executable<Boolean> byName(String name) {
  35                 nodeIdentifier.set(name);
  36                 return this::execute;
  37         }
  38
  39         private ListenableFuture<Boolean> execute() {
  40                 return threadPool.submit(this::executeDialog);
  41         }
  42
  43         private boolean executeDialog() throws IOException, ExecutionException, InterruptedException {
  44                 RemovePeer removePeer = new RemovePeer(new RandomIdentifierGenerator().generate(), nodeIdentifier.get());
  45                 try (RemovePeerDialog removePeerDialog = new RemovePeerDialog()) {
  46                         return removePeerDialog.send(removePeer).get();
  47                 }
  48         }
  49
  50         private class RemovePeerDialog extends FcpDialog<Boolean> {
  51
  52                 private final AtomicBoolean finished = new AtomicBoolean();
  53                 private final AtomicBoolean removed = new AtomicBoolean();
  54
  55                 public RemovePeerDialog() throws IOException {
  56                         super(threadPool, connectionSupplier.get());
  57                 }
  58
  59                 @Override
  60                 protected boolean isFinished() {
  61                         return finished.get() || removed.get();
  62                 }
  63
  64                 @Override
  65                 protected Boolean getResult() {
  66                         return removed.get();
  67                 }
  68
  69                 @Override
  70                 protected void consumePeerRemoved(PeerRemoved peerRemoved) {
  71                         removed.set(true);
  72                 }
  73
  74                 @Override
  75                 protected void consumeUnknownNodeIdentifier(UnknownNodeIdentifier unknownNodeIdentifier) {
  76                         finished.set(true);
  77                 }
  78
  79         }
  80
  81 }