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annotate artifacts/src/main/java/de/intevation/artifacts/CallContext.java @ 100:933bbc9fc11f

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Added license file and license headers. artifacts/trunk@1259 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 02 Nov 2010 17:23:36 +0000
parents b2e0cb83631c
children def3daabc5b5
rev   line source
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933bbc9fc11f Added license file and license headers.
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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 /**
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19 * Constant to signal that nothing should be done
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20 * with the artifact after method return.
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21 */
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22 int NOTHING = 0;
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23 /**
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24 * Constant to signal that the database timestamp
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25 * should be updated after method return.
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26 */
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27 int TOUCH = 1;
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28 /**
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29 * Constant to signal that the artifact should be stored
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30 * after method return.
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31 */
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32 int STORE = 2;
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33 /**
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34 * Constant to signal that the artifact fork a backgroud thread
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35 * and should be hold in memory till it signals that it has
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36 * finished its operation.
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37 */
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38 int BACKGROUND = 3;
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39 // int DELETE = 4;
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40 // int FOREVER = 5;
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41
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42 /**
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43 * This method may be called from feed(), describe(), advance()
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44 * and out to signal what should happend with artefact after
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45 * the current method call returns.
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46 * @param action Valid values are NOTHING, TOUCH, STORE, BACKGROUND.
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47 */
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48 void afterCall(int action);
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50 /**
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51 * When send to background with a afterCall(BACKGROUND) this
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52 * method is to be called from the background thread to signal
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53 * that the background operation has ended.
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54 * @param action Same semantics as in afterCall.
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55 */
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56 void afterBackground(int action);
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58 /**
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59 * Access to the global context of the runtime system.
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60 * @return The global context.
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61 */
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62 Object globalContext();
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64 /**
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65 * Access to the artifact database itself.
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66 * @return The database.
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67 */
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68 ArtifactDatabase getDatabase();
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70 /**
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71 * The meta data of the current call. Used to transport
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72 * language preferences of the callee e.g.
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73 * @return The meta information of this call.
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74 */
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75 CallMeta getMeta();
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77 /**
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78 * Each call context has a clipboard.
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79 * getContextValue is used to fetch data from this board.
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80 * @param key Key of the requested item.
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81 * @return The value stored for the secified value, null if
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82 * no item with this key exists.
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83 */
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84 Object getContextValue(Object key);
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86 /**
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87 * Each call context has a clipboard.
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88 * putContextValue is used to store a key/value pair onto this board.
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89 * @param key The key of the pair
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90 * @param value The value of the pair.
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91 * @return The formerly stored value under the given key.
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92 */
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93 Object putContextValue(Object key, Object value);
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94
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95 /**
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96 * Returns the time to live of the current artifact.
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97 * @return The time to live of the current artifact.
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98 */
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99 Long getTimeToLive();
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100 }
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101 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org