src/main/java/net/pterodactylus/fcp/quelaton/GetPluginInfoCommandImpl.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.GetPluginInfo;
  11 import net.pterodactylus.fcp.PluginInfo;
  12 import net.pterodactylus.fcp.ProtocolError;
  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 GetPluginInfoCommand} implementation based on {@link FcpDialog}.
  20  *
  21  * @author <a href="mailto:bombe@freenetproject.org">David ‘Bombe’ Roden</a>
  22  */
  23 public class GetPluginInfoCommandImpl implements GetPluginInfoCommand {
  24
  25         private static final RandomIdentifierGenerator IDENTIFIER = new RandomIdentifierGenerator();
  26         private final ListeningExecutorService threadPool;
  27         private final ConnectionSupplier connectionSupplier;
  28         private final GetPluginInfo getPluginInfo = new GetPluginInfo(IDENTIFIER.generate());
  29
  30         public GetPluginInfoCommandImpl(ExecutorService threadPool, ConnectionSupplier connectionSupplier) {
  31                 this.threadPool = MoreExecutors.listeningDecorator(threadPool);
  32                 this.connectionSupplier = connectionSupplier;
  33         }
  34
  35         @Override
  36         public Executable<Optional<PluginInfo>> plugin(String pluginName) {
  37                 getPluginInfo.setPluginName(pluginName);
  38                 return this::execute;
  39         }
  40
  41         private ListenableFuture<Optional<PluginInfo>> execute() {
  42                 return threadPool.submit(this::executeDialog);
  43         }
  44
  45         private Optional<PluginInfo> executeDialog() throws IOException, ExecutionException, InterruptedException {
  46                 try (GetPluginInfoDialog getPluginInfoDialog = new GetPluginInfoDialog()) {
  47                         return getPluginInfoDialog.send(getPluginInfo).get();
  48                 }
  49         }
  50
  51         private class GetPluginInfoDialog extends FcpDialog<Optional<PluginInfo>> {
  52
  53                 private final AtomicBoolean finished = new AtomicBoolean();
  54                 private final AtomicReference<PluginInfo> pluginInfo = new AtomicReference<>();
  55
  56                 public GetPluginInfoDialog() 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<PluginInfo> getResult() {
  67                         return Optional.ofNullable(pluginInfo.get());
  68                 }
  69
  70                 @Override
  71                 protected void consumePluginInfo(PluginInfo pluginInfo) {
  72                         this.pluginInfo.set(pluginInfo);
  73                         finished.set(true);
  74                 }
  75
  76                 @Override
  77                 protected void consumeProtocolError(ProtocolError protocolError) {
  78                         finished.set(true);
  79                 }
  80
  81         }
  82
  83 }