summaryrefslogtreecommitdiff
path: root/indra/newview/llattachmentsmgr.h
blob: 2834c10a2f930c2f52c687ac74464f382768294f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
/** 
 * @file llattachmentsmgr.h
 * @brief Batches up attachment requests and sends them all
 * in one message.
 *
 * $LicenseInfo:firstyear=2004&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#ifndef LL_LLATTACHMENTSMGR_H
#define LL_LLATTACHMENTSMGR_H

#include "llsingleton.h"

class LLViewerInventoryItem;

//--------------------------------------------------------------------------------
// LLAttachmentsMgr
// 
// This class manages batching up of requests at two stages of
// attachment rezzing.
//
// First, attachments requested to rez get saved in
// mPendingAttachments and sent as a single
// RezMultipleAttachmentsFromInv request. This batching is needed
// mainly because of weaknessing the UI element->inventory item
// handling, such that we don't always know when we are requesting
// multiple items. Now they just pile up and get swept into a single
// request during the idle loop.
//
// Second, after attachments arrive, we need to generate COF links for
// them. There are both efficiency and UI correctness reasons why it
// is better to request all the COF links at once and run a single
// callback after they all complete. Given the vagaries of the
// attachment system, there is no guarantee that we will get all the
// attachments we ask for, but we frequently do. So in the common case
// that all the desired attachments arrive fairly quickly, we generate
// a single batched request for COF links. If attachments arrive late
// or not at all, we will still issue COF link requests once a timeout
// value has been exceeded.
//
// To handle attachments that never arrive, we forget about requests
// that exceed a timeout value.
//--------------------------------------------------------------------------------
class LLAttachmentsMgr: public LLSingleton<LLAttachmentsMgr>
{
public:
    // Stores info for attachments that will be requested during idle.
	struct AttachmentsInfo
	{
		LLUUID mItemID;
		U8 mAttachmentPt;
		BOOL mAdd;
	};
	typedef std::vector<AttachmentsInfo> attachments_vec_t;

	LLAttachmentsMgr();
	virtual ~LLAttachmentsMgr();

	void addAttachmentRequest(const LLUUID& item_id,
                              const U8 attachment_pt,
                              const BOOL add);
	void requestAttachments(const attachments_vec_t& attachment_requests);
	static void onIdle(void *);

    void onAttachmentArrived(const LLUUID& inv_item_id);

    void onDetachRequested(const LLUUID& inv_item_id);
    void onDetachCompleted(const LLUUID& inv_item_id);

private:

    class LLItemRequestTimes: public std::map<LLUUID,LLTimer>
    {
    public:
        LLItemRequestTimes(const std::string& op_name, F32 timeout);
        void addTime(const LLUUID& inv_item_id);
        void removeTime(const LLUUID& inv_item_id);
        BOOL wasRequestedRecently(const LLUUID& item_id) const;
        BOOL getTime(const LLUUID& inv_item_id, LLTimer& timer) const;

    private:
        F32 mTimeout;
        std::string mOpName;
    };

	void removeAttachmentRequestTime(const LLUUID& inv_item_id);
	void onIdle();
	void requestPendingAttachments();
	void linkRecentlyArrivedAttachments();
    void expireOldAttachmentRequests();

    // Attachments that we are planning to rez but haven't requested from the server yet.
	attachments_vec_t mPendingAttachments;

	// Attachments that have been requested from server but have not arrived yet.
	LLItemRequestTimes mAttachmentRequests;

    // Attachments that have been requested to detach but have not gone away yet.
	LLItemRequestTimes mDetachRequests;

    // Attachments that have arrived but have not been linked in the COF yet.
    std::set<LLUUID> mRecentlyArrivedAttachments;
    LLTimer mCOFLinkBatchTimer;

};

#endif