Mercurial > dive4elements > framework
annotate artifacts/src/main/java/de/intevation/artifacts/CallContext.java @ 245:def3daabc5b5
Added a listener to be called if a call context was created and closed
artifacts/trunk@1685 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Thu, 14 Apr 2011 10:19:12 +0000 |
parents | 933bbc9fc11f |
children | eafe59ecfb7e |
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1 /* |
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2 * Copyright (c) 2010 by Intevation GmbH |
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3 * |
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4 * This program is free software under the LGPL (>=v2.1) |
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5 * Read the file LGPL.txt coming with the software for details |
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6 * or visit http://www.gnu.org/licenses/ if it does not exist. |
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7 */ |
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8 |
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9 package de.intevation.artifacts; |
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10 |
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11 /** |
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12 * Instances of this interface are given to feed(), advance(), describe() |
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13 * and out() to enable the artifact to communicate with the runtime system. |
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14 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> |
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15 */ |
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16 public interface CallContext |
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17 { |
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18 interface Listener { |
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19 void init(CallContext callContext); |
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20 void close(CallContext callContext); |
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21 } |
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22 |
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23 /** |
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24 * Constant to signal that nothing should be done |
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25 * with the artifact after method return. |
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26 */ |
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27 int NOTHING = 0; |
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28 /** |
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29 * Constant to signal that the database timestamp |
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30 * should be updated after method return. |
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31 */ |
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32 int TOUCH = 1; |
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33 /** |
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34 * Constant to signal that the artifact should be stored |
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35 * after method return. |
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36 */ |
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37 int STORE = 2; |
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38 /** |
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39 * Constant to signal that the artifact fork a backgroud thread |
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40 * and should be hold in memory till it signals that it has |
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41 * finished its operation. |
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42 */ |
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43 int BACKGROUND = 3; |
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44 // int DELETE = 4; |
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45 // int FOREVER = 5; |
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46 |
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47 /** |
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48 * This method may be called from feed(), describe(), advance() |
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49 * and out to signal what should happend with artefact after |
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50 * the current method call returns. |
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51 * @param action Valid values are NOTHING, TOUCH, STORE, BACKGROUND. |
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52 */ |
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53 void afterCall(int action); |
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54 |
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55 /** |
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56 * When send to background with a afterCall(BACKGROUND) this |
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57 * method is to be called from the background thread to signal |
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58 * that the background operation has ended. |
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59 * @param action Same semantics as in afterCall. |
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60 */ |
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61 void afterBackground(int action); |
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62 |
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63 /** |
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64 * Access to the global context of the runtime system. |
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65 * @return The global context. |
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66 */ |
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67 Object globalContext(); |
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68 |
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69 /** |
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70 * Access to the artifact database itself. |
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71 * @return The database. |
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72 */ |
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73 ArtifactDatabase getDatabase(); |
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74 |
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75 /** |
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76 * The meta data of the current call. Used to transport |
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77 * language preferences of the callee e.g. |
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78 * @return The meta information of this call. |
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79 */ |
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80 CallMeta getMeta(); |
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81 |
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82 /** |
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83 * Each call context has a clipboard. |
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84 * getContextValue is used to fetch data from this board. |
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85 * @param key Key of the requested item. |
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86 * @return The value stored for the secified value, null if |
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87 * no item with this key exists. |
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88 */ |
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89 Object getContextValue(Object key); |
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90 |
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91 /** |
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92 * Each call context has a clipboard. |
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93 * putContextValue is used to store a key/value pair onto this board. |
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94 * @param key The key of the pair |
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95 * @param value The value of the pair. |
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96 * @return The formerly stored value under the given key. |
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97 */ |
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98 Object putContextValue(Object key, Object value); |
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99 |
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100 /** |
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101 * Returns the time to live of the current artifact. |
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102 * @return The time to live of the current artifact. |
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103 */ |
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104 Long getTimeToLive(); |
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105 } |
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106 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |