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

   1 package net.pterodactylus.fcp.quelaton;
   2
   3 import java.io.IOException;
   4 import java.io.InputStream;
   5 import java.util.Optional;
   6 import java.util.concurrent.Callable;
   7 import java.util.concurrent.ExecutionException;
   8 import java.util.concurrent.ExecutorService;
   9 import java.util.concurrent.atomic.AtomicBoolean;
  10 import java.util.concurrent.atomic.AtomicReference;
  11
  12 import net.pterodactylus.fcp.AllData;
  13 import net.pterodactylus.fcp.ClientGet;
  14 import net.pterodactylus.fcp.FcpMessage;
  15 import net.pterodactylus.fcp.FcpUtils.TempInputStream;
  16 import net.pterodactylus.fcp.GetFailed;
  17 import net.pterodactylus.fcp.Priority;
  18 import net.pterodactylus.fcp.ReturnType;
  19
  20 import com.google.common.util.concurrent.ListenableFuture;
  21 import com.google.common.util.concurrent.ListeningExecutorService;
  22 import com.google.common.util.concurrent.MoreExecutors;
  23
  24 /**
  25  * Implementation of the {@link ClientGetCommand}.
  26  *
  27  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  28  */
  29 class ClientGetCommandImpl implements ClientGetCommand {
  30
  31         private final ListeningExecutorService threadPool;
  32         private final ConnectionSupplier connectionSupplier;
  33
  34         private boolean ignoreDataStore;
  35         private boolean dataStoreOnly;
  36         private Long maxSize;
  37         private Priority priority;
  38         private boolean realTime;
  39         private boolean global;
  40
  41         public ClientGetCommandImpl(ExecutorService threadPool, ConnectionSupplier connectionSupplier) {
  42                 this.threadPool = MoreExecutors.listeningDecorator(threadPool);
  43                 this.connectionSupplier = connectionSupplier;
  44         }
  45
  46         @Override
  47         public ClientGetCommand ignoreDataStore() {
  48                 ignoreDataStore = true;
  49                 return this;
  50         }
  51
  52         @Override
  53         public ClientGetCommand dataStoreOnly() {
  54                 dataStoreOnly = true;
  55                 return this;
  56         }
  57
  58         @Override
  59         public ClientGetCommand maxSize(long maxSize) {
  60                 this.maxSize = maxSize;
  61                 return this;
  62         }
  63
  64         @Override
  65         public ClientGetCommand priority(Priority priority) {
  66                 this.priority = priority;
  67                 return this;
  68         }
  69
  70         @Override
  71         public ClientGetCommand realTime() {
  72                 realTime = true;
  73                 return this;
  74         }
  75
  76         @Override
  77         public ClientGetCommand global() {
  78                 global = true;
  79                 return this;
  80         }
  81
  82         @Override
  83         public Executable<Optional<Data>> uri(String uri) {
  84                 return () -> threadPool.submit(() -> execute(uri));
  85         }
  86
  87         private Optional<Data> execute(String uri) throws InterruptedException, ExecutionException, IOException {
  88                 ClientGet clientGet = createClientGetCommand(uri);
  89                 try (ClientGetReplySequence clientGetReplySequence = new ClientGetReplySequence()) {
  90                         return clientGetReplySequence.send(clientGet).get();
  91                 }
  92         }
  93
  94         private ClientGet createClientGetCommand(String uri) {
  95                 String identifier = new RandomIdentifierGenerator().generate();
  96                 ClientGet clientGet = new ClientGet(uri, identifier, ReturnType.direct);
  97                 if (ignoreDataStore) {
  98                         clientGet.setIgnoreDataStore(true);
  99                 }
 100                 if (dataStoreOnly) {
 101                         clientGet.setDataStoreOnly(true);
 102                 }
 103                 if (maxSize != null) {
 104                         clientGet.setMaxSize(maxSize);
 105                 }
 106                 if (priority != null) {
 107                         clientGet.setPriority(priority);
 108                 }
 109                 if (realTime) {
 110                         clientGet.setRealTimeFlag(true);
 111                 }
 112                 if (global) {
 113                         clientGet.setGlobal(true);
 114                 }
 115                 return clientGet;
 116         }
 117
 118         private class ClientGetReplySequence extends FcpReplySequence<Optional<Data>> {
 119
 120                 private final AtomicBoolean finished = new AtomicBoolean();
 121                 private final AtomicBoolean failed = new AtomicBoolean();
 122
 123                 private String contentType;
 124                 private long dataLength;
 125                 private InputStream payload;
 126
 127                 public ClientGetReplySequence() throws IOException {
 128                         super(ClientGetCommandImpl.this.threadPool, ClientGetCommandImpl.this.connectionSupplier.get());
 129                 }
 130
 131                 @Override
 132                 protected boolean isFinished() {
 133                         return finished.get() || failed.get();
 134                 }
 135
 136                 @Override
 137                 protected Optional<Data> getResult() {
 138                         return failed.get() ? Optional.empty() : Optional.of(new Data() {
 139                                 @Override
 140                                 public String getMimeType() {
 141                                         return contentType;
 142                                 }
 143
 144                                 @Override
 145                                 public long size() {
 146                                         return dataLength;
 147                                 }
 148
 149                                 @Override
 150                                 public InputStream getInputStream() {
 151                                         return payload;
 152                                 }
 153                         });
 154                 }
 155
 156                 @Override
 157                 protected void consumeAllData(AllData allData) {
 158                         synchronized (this) {
 159                                 contentType = allData.getContentType();
 160                                 dataLength = allData.getDataLength();
 161                                 try {
 162                                         payload = new TempInputStream(allData.getPayloadInputStream(), dataLength);
 163                                         finished.set(true);
 164                                 } catch (IOException e) {
 165                                         // TODO – logging
 166                                         failed.set(true);
 167                                 }
 168                         }
 169                 }
 170
 171                 @Override
 172                 protected void consumeGetFailed(GetFailed getFailed) {
 173                         failed.set(true);
 174                 }
 175
 176         }
 177
 178 }