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 import java.util.function.Supplier;
   9
  10 import net.pterodactylus.fcp.PeerRemoved;
  11 import net.pterodactylus.fcp.RemovePeer;
  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 RemovePeerCommand} implementation based on {@link FcpDialog}.
  20  *
  21  * @author <a href="mailto:bombe@freenetproject.org">David ‘Bombe’ Roden</a>
  22  */
  23 public class RemovePeerCommandImpl implements RemovePeerCommand {
  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 RemovePeerCommandImpl(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<Boolean> byName(String name) {
  38                 nodeIdentifier.set(name);
  39                 return this::execute;
  40         }
  41
  42         @Override
  43         public Executable<Boolean> byIdentity(String nodeIdentity) {
  44                 nodeIdentifier.set(nodeIdentity);
  45                 return this::execute;
  46         }
  47
  48         @Override
  49         public Executable<Boolean> byHostAndPort(String host, int port) {
  50                 nodeIdentifier.set(String.format("%s:%d", host, port));
  51                 return this::execute;
  52         }
  53
  54         private ListenableFuture<Boolean> execute() {
  55                 return threadPool.submit(this::executeDialog);
  56         }
  57
  58         private boolean executeDialog() throws IOException, ExecutionException, InterruptedException {
  59                 RemovePeer removePeer = new RemovePeer(identifierGenerator.get(), nodeIdentifier.get());
  60                 try (RemovePeerDialog removePeerDialog = new RemovePeerDialog()) {
  61                         return removePeerDialog.send(removePeer).get();
  62                 }
  63         }
  64
  65         private class RemovePeerDialog extends FcpDialog<Boolean> {
  66
  67                 private final AtomicBoolean finished = new AtomicBoolean();
  68                 private final AtomicBoolean removed = new AtomicBoolean();
  69
  70                 public RemovePeerDialog() throws IOException {
  71                         super(threadPool, connectionSupplier.get());
  72                 }
  73
  74                 @Override
  75                 protected boolean isFinished() {
  76                         return finished.get() || removed.get();
  77                 }
  78
  79                 @Override
  80                 protected Boolean getResult() {
  81                         return removed.get();
  82                 }
  83
  84                 @Override
  85                 protected void consumePeerRemoved(PeerRemoved peerRemoved) {
  86                         removed.set(true);
  87                 }
  88
  89                 @Override
  90                 protected void consumeUnknownNodeIdentifier(UnknownNodeIdentifier unknownNodeIdentifier) {
  91                         finished.set(true);
  92                 }
  93
  94         }
  95
  96 }