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1 | C:\Merge Test Files\8.0.47\java\org\apache\catalina\comet | CometFilter.java | Fri Sep 29 16:53:28 2017 UTC |
2 | Mon Nov 20 14:15:53 2017 UTC | ||
3 | Mon Nov 20 14:15:53 2017 UTC | ||
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1 | /* | |||||||||
2 | * License d to the A pache Soft ware Found ation (ASF ) under on e or more | |||||||||
3 | * contrib utor licen se agreeme nts. See the NOTICE file dist ributed wi th | |||||||||
4 | * this wo rk for add itional in formation regarding copyright ownership. | |||||||||
5 | * The ASF licenses this file to You und er the Apa che Licens e, Version 2.0 | |||||||||
6 | * (the "L icense"); you may no t use this file exce pt in comp liance wit h | |||||||||
7 | * the Lic ense. You may obtai n a copy o f the Lice nse at | |||||||||
8 | * | |||||||||
9 | * ht tp://www.a pache.org/ licenses/L ICENSE-2.0 | |||||||||
10 | * | |||||||||
11 | * Unless required b y applicab le law or agreed to in writing , software | |||||||||
12 | * distrib uted under the Licen se is dist ributed on an "AS IS " BASIS, | |||||||||
13 | * WITHOUT WARRANTIE S OR CONDI TIONS OF A NY KIND, e ither expr ess or imp lied. | |||||||||
14 | * See the License f or the spe cific lang uage gover ning permi ssions and | |||||||||
15 | * limitat ions under the Licen se. | |||||||||
16 | */ | |||||||||
17 | ||||||||||
18 | ||||||||||
19 | package or g.apache.c atalina.co met; | |||||||||
20 | ||||||||||
21 | import jav a.io.IOExc eption; | |||||||||
22 | ||||||||||
23 | import jav ax.servlet .Filter; | |||||||||
24 | import jav ax.servlet .ServletEx ception; | |||||||||
25 | ||||||||||
26 | /** | |||||||||
27 | * A Comet filter, s imilar to regular fi lters, per forms filt ering task s on eithe r | |||||||||
28 | * the req uest to a resource ( a Comet se rvlet), or on the re sponse fro m a resour ce, or bot h. | |||||||||
29 | * <br><br > | |||||||||
30 | * Filters perform f iltering i n the <cod e>doFilter Event</cod e> method. Every Fil ter has ac cess to | |||||||||
31 | * a Filte rConfig ob ject from which it c an obtain its initia lization p arameters, a | |||||||||
32 | * referen ce to the ServletCon text which it can us e, for exa mple, to l oad resour ces | |||||||||
33 | * needed for filter ing tasks. | |||||||||
34 | * <p> | |||||||||
35 | * Filters are confi gured in t he deploym ent descri ptor of a web applic ation | |||||||||
36 | * <p> | |||||||||
37 | * Example s that hav e been ide ntified fo r this des ign are<br > | |||||||||
38 | * 1) Auth entication Filters < br> | |||||||||
39 | * 2) Logg ing and Au diting Fil ters <br> | |||||||||
40 | * 3) Imag e conversi on Filters <br> | |||||||||
41 | * 4) Data compressi on Filters <br> | |||||||||
42 | * 5) Encr yption Fil ters <br> | |||||||||
43 | * 6) Toke nizing Fil ters <br> | |||||||||
44 | * 7) Filt ers that t rigger res ource acce ss events <br> | |||||||||
45 | * 8) XSL/ T filters <br> | |||||||||
46 | * 9) Mime -type chai n Filter < br> | |||||||||
47 | * <br> | |||||||||
48 | * | |||||||||
49 | * @author Remy Mauc herat | |||||||||
50 | */ | |||||||||
51 | public int erface Com etFilter e xtends Fil ter { | |||||||||
52 | ||||||||||
53 | ||||||||||
54 | /** | |||||||||
55 | * The <code>doF ilterEvent </code> me thod of th e CometFil ter is cal led by the container | |||||||||
56 | * eac h time a r equest/res ponse pair is passed through t he chain d ue | |||||||||
57 | * to a client e vent for a resource at the end of the ch ain. The C ometFilter Chain pass ed in to t his | |||||||||
58 | * met hod allows the Filte r to pass on the eve nt to the next entit y in the | |||||||||
59 | * cha in.<p> | |||||||||
60 | * A t ypical imp lementatio n of this method wou ld follow the follow ing patter n:- <br> | |||||||||
61 | * 1. Examine th e request< br> | |||||||||
62 | * 2. Optionally wrap the request ob ject conta ined in th e event wi th a custo m implemen tation to | |||||||||
63 | * fil ter conten t or heade rs for inp ut filteri ng and pas s a CometE vent insta nce contai ning | |||||||||
64 | * the wrapped r equest to the next f ilter<br> | |||||||||
65 | * 3. Optionally wrap the response o bject cont ained in t he event w ith a cust om impleme ntation to | |||||||||
66 | * fil ter conten t or heade rs for out put filter ing and pa ss a Comet Event inst ance conta ining | |||||||||
67 | * the wrapped r equest to the next f ilter<br> | |||||||||
68 | * 4. a) <strong >Either</s trong> inv oke the ne xt entity in the cha in using t he CometFi lterChain object (<c ode>chain. doFilterEv ent()</cod e>), <br> | |||||||||
69 | * 4. b) <strong >or</stron g> not pas s on the r equest/res ponse pair to the ne xt entity in the fil ter chain to block t he event p rocessing< br> | |||||||||
70 | * 5. Directly s et fields on the res ponse afte r invocati on of the next entit y in the f ilter chai n. | |||||||||
71 | * | |||||||||
72 | * @pa ram event the event that is be ing proces sed. Anoth er event m ay be pass ed along t he chain. | |||||||||
73 | * @pa ram chain | |||||||||
74 | * @th rows IOExc eption | |||||||||
75 | * @th rows Servl etExceptio n | |||||||||
76 | */ | |||||||||
77 | public void doFi lterEvent( CometEvent event, Co metFilterC hain chain ) | |||||||||
78 | th rows IOExc eption, Se rvletExcep tion; | |||||||||
79 | ||||||||||
80 | ||||||||||
81 | } |
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