| 1 | /************************************************************************** |
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| 2 | * Copyright (C) 2004-2007 by Michael Medin <michael@medin.name> * |
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| 3 | * * |
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| 4 | * This code is part of NSClient++ - http://trac.nakednuns.org/nscp * |
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| 5 | * * |
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| 6 | * This program is free software; you can redistribute it and/or modify * |
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| 7 | * it under the terms of the GNU General Public License as published by * |
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| 8 | * the Free Software Foundation; either version 2 of the License, or * |
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| 9 | * (at your option) any later version. * |
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| 10 | * * |
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| 11 | * This program is distributed in the hope that it will be useful, * |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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| 14 | * GNU General Public License for more details. * |
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| 15 | * * |
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| 16 | * You should have received a copy of the GNU General Public License * |
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| 17 | * along with this program; if not, write to the * |
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| 18 | * Free Software Foundation, Inc., * |
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| 19 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * |
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| 20 | ***************************************************************************/ |
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| 21 | #pragma once |
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| 22 | |
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| 23 | #include <PDHCounter.h> |
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| 24 | #include <Mutex.h> |
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| 25 | namespace PDHCollectors { |
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| 26 | const int format_large = 0x00000400; |
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| 27 | const int format_long = 0x00000100; |
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| 28 | const int format_double = 0x00000200; |
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| 29 | |
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| 30 | class PDHException { |
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| 31 | std::wstring error_; |
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| 32 | public: |
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| 33 | PDHException(std::wstring error) : error_(error) {} |
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| 34 | std::wstring getError() const { return error_; } |
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| 35 | |
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| 36 | }; |
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| 37 | class TPDHCounterMutex { |
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| 38 | public: |
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| 39 | virtual void lock() = 0; |
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| 40 | virtual bool hasLock(bool silent = true) = 0; |
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| 41 | virtual void release() = 0; |
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| 42 | }; |
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| 43 | |
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| 44 | class PDHCounterNoMutex : public TPDHCounterMutex { |
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| 45 | public: |
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| 46 | void lock() {} |
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| 47 | bool hasLock(bool silent = true) { |
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| 48 | return true; |
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| 49 | } |
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| 50 | void release() {} |
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| 51 | }; |
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| 52 | class PDHCounterNormalMutex : public TPDHCounterMutex { |
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| 53 | MutexHandler mutex_; |
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| 54 | ManualMutexLock lock_; |
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| 55 | public: |
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| 56 | PDHCounterNormalMutex() : lock_(mutex_) {} |
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| 57 | void lock() { |
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| 58 | lock_.lock(); |
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| 59 | } |
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| 60 | bool hasLock(bool silent = true) { |
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| 61 | if (!silent && !lock_.hasMutex()) { |
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| 62 | std::wcout << _T("We never got the mutex... sorry...") << std::endl; |
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| 63 | } |
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| 64 | return lock_.hasMutex(); |
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| 65 | } |
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| 66 | void release() { |
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| 67 | lock_.release(); |
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| 68 | } |
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| 69 | }; |
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| 70 | class PDHCounterMutexHandler { |
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| 71 | private: |
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| 72 | TPDHCounterMutex *mutex_; // Handle to the mutex object. |
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| 73 | public: |
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| 74 | /** |
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| 75 | * Default c-tor. |
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| 76 | * Waits for the mutex object. |
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| 77 | * @param mutex The mutex to use |
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| 78 | * @timeout The timeout before abandoning wait |
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| 79 | */ |
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| 80 | PDHCounterMutexHandler(TPDHCounterMutex *mutex) : mutex_(mutex) { |
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| 81 | if (mutex == NULL) { |
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| 82 | std::wcout << _T("Error in mutex lock: ") << std::endl; |
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| 83 | mutex = NULL; |
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| 84 | return; |
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| 85 | } |
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| 86 | mutex->lock(); |
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| 87 | } |
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| 88 | /** |
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| 89 | * An attempt to simplify the has mutex thingy (don't know if it works, haven't tried it since I wrote this class a few years ago :) |
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| 90 | * @return true if we have a mutex lock. |
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| 91 | */ |
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| 92 | operator bool () const { |
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| 93 | return mutex_!=NULL&&mutex_->hasLock(); |
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| 94 | } |
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| 95 | /** |
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| 96 | * Check if we actually got the mutex (might have timed out) |
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| 97 | * @return |
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| 98 | */ |
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| 99 | bool hasLock(bool silent = true) const { |
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| 100 | return mutex_!=NULL&&mutex_->hasLock(silent); |
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| 101 | } |
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| 102 | /** |
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| 103 | * Default d-tor. |
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| 104 | * Release the mutex |
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| 105 | */ |
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| 106 | virtual ~PDHCounterMutexHandler() { |
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| 107 | mutex_->release(); |
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| 108 | } |
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| 109 | }; |
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| 110 | |
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| 111 | template <class TType, int TCollectionFormat, class TMutextHandler = PDHCounterNoMutex> |
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| 112 | class StaticPDHCounterListener {}; |
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| 113 | |
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| 114 | template <class TType, class TMutextHandler> |
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| 115 | class StaticPDHCounterListener<TType, format_double, TMutextHandler> : public PDH::PDHCounterListener { |
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| 116 | TType value_; |
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| 117 | TMutextHandler mutex_; |
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| 118 | public: |
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| 119 | StaticPDHCounterListener() : value_(0) {} |
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| 120 | virtual void collect(const PDH::PDHCounter &counter) { |
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| 121 | PDHCounterMutexHandler mutex(&mutex_); |
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| 122 | if (!mutex.hasLock()) |
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| 123 | return; |
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| 124 | value_ = counter.getDoubleValue(); |
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| 125 | } |
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| 126 | void attach(const PDH::PDHCounter &counter){} |
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| 127 | void detach(const PDH::PDHCounter &counter){} |
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| 128 | TType getValue() { |
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| 129 | PDHCounterMutexHandler mutex(&mutex_); |
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| 130 | if (!mutex.hasLock()) |
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| 131 | return -1; |
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| 132 | return value_; |
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| 133 | } |
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| 134 | DWORD getFormat() const { |
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| 135 | return format_double; |
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| 136 | } |
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| 137 | }; |
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| 138 | |
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| 139 | template <class TType, class TMutextHandler> |
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| 140 | class StaticPDHCounterListener<TType, format_long, TMutextHandler> : public PDH::PDHCounterListener { |
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| 141 | TType value_; |
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| 142 | TMutextHandler mutex_; |
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| 143 | public: |
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| 144 | StaticPDHCounterListener() : value_(0) {} |
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| 145 | virtual void collect(const PDH::PDHCounter &counter) { |
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| 146 | PDHCounterMutexHandler mutex(&mutex_); |
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| 147 | if (!mutex.hasLock()) |
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| 148 | return; |
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| 149 | value_ = counter.getIntValue(); |
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| 150 | } |
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| 151 | void attach(const PDH::PDHCounter &counter){} |
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| 152 | void detach(const PDH::PDHCounter &counter){} |
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| 153 | TType getValue() { |
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| 154 | PDHCounterMutexHandler mutex(&mutex_); |
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| 155 | if (!mutex.hasLock()) |
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| 156 | return -1; |
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| 157 | return value_; |
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| 158 | } |
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| 159 | DWORD getFormat() const { |
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| 160 | return format_long; |
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| 161 | } |
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| 162 | }; |
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| 163 | |
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| 164 | template <class TType, class TMutextHandler> |
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| 165 | class StaticPDHCounterListener<TType, format_large, TMutextHandler> : public PDH::PDHCounterListener { |
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| 166 | TMutextHandler mutex_; |
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| 167 | TType value_; |
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| 168 | public: |
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| 169 | StaticPDHCounterListener() : value_(0) {} |
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| 170 | virtual void collect(const PDH::PDHCounter &counter) { |
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| 171 | PDHCounterMutexHandler mutex(&mutex_); |
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| 172 | if (!mutex.hasLock()) |
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| 173 | return; |
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| 174 | value_ = counter.getInt64Value(); |
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| 175 | } |
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| 176 | void attach(const PDH::PDHCounter &counter){} |
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| 177 | void detach(const PDH::PDHCounter &counter){} |
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| 178 | TType getValue() { |
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| 179 | PDHCounterMutexHandler mutex(&mutex_); |
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| 180 | if (!mutex.hasLock()) |
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| 181 | return -1; |
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| 182 | return value_; |
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| 183 | } |
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| 184 | DWORD getFormat() const { |
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| 185 | return format_large; |
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| 186 | } |
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| 187 | }; |
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| 188 | |
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| 189 | |
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| 190 | template <class TType, class TMutextHandler> |
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| 191 | class RoundINTPDHBufferListenerImpl : public PDH::PDHCounterListener { |
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| 192 | TMutextHandler mutex_; |
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| 193 | unsigned int length; |
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| 194 | TType *buffer; |
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| 195 | unsigned int current; |
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| 196 | public: |
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| 197 | RoundINTPDHBufferListenerImpl() : buffer(NULL), length(0), current(0) {} |
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| 198 | RoundINTPDHBufferListenerImpl(int length_) : length(length_), current(0) { |
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| 199 | PDHCounterMutexHandler mutex(mutex_); |
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| 200 | if (!mutex.hasLock()) |
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| 201 | return; |
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| 202 | buffer = new int[length]; |
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| 203 | for (unsigned int i=0; i<length;i++) |
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| 204 | buffer[i] = 0; |
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| 205 | } |
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| 206 | virtual ~RoundINTPDHBufferListenerImpl() { |
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| 207 | PDHCounterMutexHandler mutex(&mutex_); |
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| 208 | if (!mutex.hasLock()) |
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| 209 | return; |
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| 210 | delete [] buffer; |
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| 211 | } |
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| 212 | |
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| 213 | /** |
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| 214 | * Resize the buffer to a new length |
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| 215 | * |
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| 216 | * @todo Make this copy the old buffer if there is one. |
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| 217 | * |
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| 218 | * @param newLength The new length |
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| 219 | */ |
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| 220 | void resize(int newLength) { |
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| 221 | PDHCounterMutexHandler mutex(&mutex_); |
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| 222 | if (!mutex.hasLock()) |
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| 223 | return; |
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| 224 | delete [] buffer; |
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| 225 | |
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| 226 | current = 0; |
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| 227 | length = newLength; |
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| 228 | |
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| 229 | buffer = new TType[length]; |
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| 230 | for (unsigned int i=0; i<length;i++) |
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| 231 | buffer[i] = 0; |
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| 232 | |
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| 233 | } |
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| 234 | |
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| 235 | virtual void collect(const PDH::PDHCounter &counter) = 0; |
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| 236 | |
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| 237 | void attach(const PDH::PDHCounter &counter){} |
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| 238 | void detach(const PDH::PDHCounter &counter){} |
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| 239 | void pushValue(TType value) { |
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| 240 | PDHCounterMutexHandler mutex(&mutex_); |
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| 241 | if (!mutex.hasLock()) |
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| 242 | return; |
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| 243 | if (buffer == NULL) |
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| 244 | return; |
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| 245 | if (current >= length) |
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| 246 | return; |
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| 247 | buffer[current++] = value; |
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| 248 | if (current >= length) |
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| 249 | current = 0; |
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| 250 | } |
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| 251 | double getAvrage(unsigned int backItems) { |
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| 252 | PDHCounterMutexHandler mutex(&mutex_); |
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| 253 | if (!mutex.hasLock(true)) |
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| 254 | throw PDHException(_T("Failed to get mutex :(")); |
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| 255 | if ((backItems == 0) || (backItems >= length)) |
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| 256 | return -1; |
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| 257 | double ret = 0; |
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| 258 | if (current >= backItems) { |
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| 259 | // Handle "whole" list. |
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| 260 | for (unsigned int i=current-backItems; i<current;i++) |
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| 261 | ret += buffer[i]; |
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| 262 | } else { |
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| 263 | // Handle split list. |
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| 264 | for (unsigned int i=0; i<current;i++) |
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| 265 | ret += buffer[i]; |
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| 266 | for (unsigned int i=length-backItems+current; i<length;i++) |
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| 267 | ret += buffer[i]; |
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| 268 | } |
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| 269 | return (ret/backItems); |
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| 270 | } |
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| 271 | inline unsigned int getLength() const { |
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| 272 | return length; |
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| 273 | } |
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| 274 | }; |
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| 275 | |
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| 276 | |
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| 277 | template <class TType, DWORD TCollectionFormat, class TMutextHandler = PDHCounterNoMutex> |
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| 278 | class RoundINTPDHBufferListener : public RoundINTPDHBufferListenerImpl<TType, TMutextHandler> { |
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| 279 | }; |
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| 280 | |
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| 281 | template <class TType, class TMutextHandler> |
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| 282 | class RoundINTPDHBufferListener<TType, format_double, TMutextHandler> : public RoundINTPDHBufferListenerImpl<TType, TMutextHandler> { |
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| 283 | public: |
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| 284 | RoundINTPDHBufferListener() {} |
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| 285 | RoundINTPDHBufferListener(int length) : RoundINTPDHBufferListenerImpl(length) {} |
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| 286 | |
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| 287 | virtual void collect(const PDH::PDHCounter &counter) { |
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| 288 | pushValue(counter.getDoubleValue()); |
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| 289 | } |
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| 290 | virtual DWORD getFormat() const { |
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| 291 | return format_double; |
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| 292 | } |
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| 293 | }; |
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| 294 | |
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| 295 | template <class TType, class TMutextHandler> |
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| 296 | class RoundINTPDHBufferListener<TType, format_long, TMutextHandler> : public RoundINTPDHBufferListenerImpl<TType, TMutextHandler> { |
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| 297 | public: |
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| 298 | RoundINTPDHBufferListener() {} |
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| 299 | RoundINTPDHBufferListener(int length) : RoundINTPDHBufferListenerImpl(length) {} |
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| 300 | |
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| 301 | virtual void collect(const PDH::PDHCounter &counter) { |
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| 302 | pushValue(counter.getIntValue()); |
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| 303 | } |
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| 304 | virtual DWORD getFormat() const { |
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| 305 | return format_long; |
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| 306 | } |
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| 307 | }; |
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| 308 | |
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| 309 | template <class TType, class TMutextHandler> |
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| 310 | class RoundINTPDHBufferListener<TType, format_large, TMutextHandler> : public RoundINTPDHBufferListenerImpl<TType, TMutextHandler> { |
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| 311 | public: |
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| 312 | RoundINTPDHBufferListener() {} |
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| 313 | RoundINTPDHBufferListener(int length) : RoundINTPDHBufferListenerImpl(length) {} |
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| 314 | |
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| 315 | virtual void collect(const PDH::PDHCounter &counter) { |
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| 316 | pushValue(counter.getInt64Value()); |
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| 317 | } |
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| 318 | virtual DWORD getFormat() const { |
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| 319 | return format_large; |
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| 320 | } |
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| 321 | }; |
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| 322 | } |
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