Mercurial > hg > blitz_condensed
annotate src/EDU/oswego/cs/dl/util/concurrent/misc/PipedChannel.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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1 |
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2 package EDU.oswego.cs.dl.util.concurrent.misc; |
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3 import EDU.oswego.cs.dl.util.concurrent.*; |
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4 |
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5 import java.io.*; |
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6 |
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7 /** |
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8 * A channel based on a java.io.PipedInputStream and |
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9 * java.io.PipedOutputStream. Elements are serialized |
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10 * using ObjectInputStreams and ObjectOutputStreams |
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11 * upon insertion and extraction from the pipe. |
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12 * <p> |
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13 * IO Exceptions are transformed into Errors. This is |
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14 * in general not a good idea, but seems to be the most |
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15 * reasonable compromise for the intended usage contexts. |
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16 * <p> |
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17 * <b>Status</b> Uncertain. There are enough |
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18 * conceptual and implementation snags surrounding use |
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19 * of pipes as Channels to downplay use. However, |
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20 * without such bridges, people would have to |
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21 * duplicate code that should work the same way in both cases. |
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22 * |
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23 * <p>[<a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. </a>] |
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24 **/ |
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25 |
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26 public class PipedChannel extends SemaphoreControlledChannel { |
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27 protected ObjectInputStream in_; |
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28 protected ObjectOutputStream out_; |
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29 |
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30 protected final PipedOutputStream outp_; |
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31 protected final PipedInputStream inp_; |
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32 |
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33 |
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34 public PipedChannel() { |
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35 super(1); |
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36 |
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37 try { |
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38 outp_ = new PipedOutputStream(); |
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39 inp_ = new PipedInputStream(); |
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40 inp_.connect(outp_); |
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41 } |
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42 catch (IOException ex) { |
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43 ex.printStackTrace(); |
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44 throw new Error("Cannot construct Pipe?"); |
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45 } |
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46 } |
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47 |
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48 |
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49 /** |
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50 * Return input stream, first constructing if necessary. |
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51 * Needed because Object streams can block on open. |
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52 **/ |
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53 |
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54 protected synchronized ObjectInputStream in() { |
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55 try { |
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56 if (in_ == null) in_ = new ObjectInputStream(inp_); |
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57 return in_; |
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58 } |
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59 catch (IOException ex) { |
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60 ex.printStackTrace(); |
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61 throw new Error("IO exception during open"); |
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62 } |
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63 } |
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64 |
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65 /** |
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66 * Return output stream, first constructing if necessary. |
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67 * Needed because Object streams can block on open. |
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68 **/ |
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69 protected synchronized ObjectOutputStream out() { |
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70 try { |
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71 if (out_ == null) out_ = new ObjectOutputStream(outp_); |
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72 return out_; |
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73 } |
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74 catch (IOException ex) { |
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75 ex.printStackTrace(); |
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76 throw new Error("IO exception during open"); |
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77 } |
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78 } |
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79 |
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80 |
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81 /** Shared mechanics for put-based methods **/ |
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82 protected void insert(Object x) { |
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83 try { |
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84 out().writeObject(x); |
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85 } |
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86 catch (InterruptedIOException ex) { |
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87 Thread.currentThread().interrupt(); |
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88 } |
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89 catch (IOException ex) { |
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90 ex.printStackTrace(); |
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91 throw new Error("IO exception during put"); |
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92 } |
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93 } |
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94 |
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95 /** Shared mechanics for take-based methods **/ |
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96 protected Object extract() { |
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97 try { |
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98 return in().readObject(); |
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99 } |
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100 catch (InterruptedIOException ex) { |
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101 Thread.currentThread().interrupt(); |
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102 return null; |
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103 } |
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104 catch (IOException ex) { |
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105 ex.printStackTrace(); |
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106 throw new Error("IO exception during take"); |
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107 } |
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108 catch (ClassNotFoundException ex) { |
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109 ex.printStackTrace(); |
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110 throw new Error("Serialization exception during take"); |
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111 } |
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112 } |
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113 |
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114 /** Stubbed out for now **/ |
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115 public Object peek() { return null; } |
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116 } |
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117 |