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1 | /* | |
2 | * $Id$ | |
3 | * | |
4 | * DEBUG: section 54 Interprocess Communication | |
5 | * | |
6 | */ | |
7 | ||
8 | #ifndef SQUID_IPC_INQUIRER_H | |
9 | #define SQUID_IPC_INQUIRER_H | |
10 | ||
11 | #include "base/AsyncJobCalls.h" | |
12 | #include "base/AsyncJob.h" | |
13 | #include "ipc/forward.h" | |
14 | #include "ipc/Request.h" | |
15 | #include "ipc/Response.h" | |
16 | #include "ipc/StrandCoords.h" | |
17 | #include <map> | |
18 | ||
19 | namespace Ipc | |
20 | { | |
21 | ||
22 | /// Coordinator's job that sends a cache manage request to each strand, | |
23 | /// aggregating individual strand responses and dumping the result if needed | |
24 | class Inquirer: public AsyncJob | |
25 | { | |
26 | public: | |
27 | Inquirer(Request::Pointer aRequest, const Ipc::StrandCoords& coords, double aTimeout); | |
28 | virtual ~Inquirer(); | |
29 | ||
30 | /// finds and calls the right Inquirer upon strand's response | |
31 | static void HandleRemoteAck(const Response& response); | |
32 | ||
33 | /* has-to-be-public AsyncJob API */ | |
34 | virtual void callException(const std::exception& e); | |
35 | ||
36 | protected: | |
37 | /* AsyncJob API */ | |
38 | virtual void start(); | |
39 | virtual void swanSong(); | |
40 | virtual bool doneAll() const; | |
41 | virtual const char *status() const; | |
42 | ||
43 | /// inquire the next strand | |
44 | virtual void inquire(); | |
45 | /// perform cleanup actions on completion of job | |
46 | virtual void cleanup(); | |
47 | /// do specific exception handling | |
48 | virtual void handleException(const std::exception& e); | |
49 | /// send response to client | |
50 | virtual void sendResponse() = 0; | |
51 | /// perform aggregating of responses and returns true if need to continue | |
52 | virtual bool aggregate(Response::Pointer aResponse) = 0; | |
53 | ||
54 | private: | |
55 | typedef UnaryMemFunT<Inquirer, Response::Pointer, Response::Pointer> HandleAckDialer; | |
56 | ||
57 | void handleRemoteAck(Response::Pointer response); | |
58 | ||
59 | static AsyncCall::Pointer DequeueRequest(unsigned int requestId); | |
60 | ||
61 | static void RequestTimedOut(void* param); | |
62 | void requestTimedOut(); | |
63 | void removeTimeoutEvent(); | |
64 | ||
65 | protected: | |
66 | Request::Pointer request; ///< cache manager request received from client | |
67 | ||
68 | Ipc::StrandCoords strands; ///< all strands we want to query, in order | |
69 | Ipc::StrandCoords::const_iterator pos; ///< strand we should query now | |
70 | ||
71 | const double timeout; ///< number of seconds to wait for strand response | |
72 | ||
73 | /// maps request->id to Inquirer::handleRemoteAck callback | |
74 | typedef std::map<unsigned int, AsyncCall::Pointer> RequestsMap; | |
75 | static RequestsMap TheRequestsMap; ///< pending strand requests | |
76 | ||
77 | static unsigned int LastRequestId; ///< last requestId used | |
78 | ||
79 | CBDATA_CLASS2(Inquirer); | |
80 | }; | |
81 | ||
82 | } // namespace Ipc | |
83 | ||
84 | #endif /* SQUID_IPC_INQUIRER_H */ |