A uint64 array wrapper for optimized allocation and copying
Bug: 315052795
Bug: 357697495
Test: atest libbattery_test; atest FrameworksCoreTests
Flag: EXEMPT bugfix
Change-Id: I3c09c438131b3f67ef04436667e589d1d86aff71
diff --git a/libs/battery/MultiStateCounter.h b/libs/battery/MultiStateCounter.h
index 04b7186..fadc4ff 100644
--- a/libs/battery/MultiStateCounter.h
+++ b/libs/battery/MultiStateCounter.h
@@ -35,12 +35,12 @@
typedef uint16_t state_t;
-template <class T>
+template <class T, class V>
class MultiStateCounter {
- uint16_t stateCount;
+ const uint16_t stateCount;
+ const V emptyValue;
state_t currentState;
time_t lastStateChangeTimestamp;
- T emptyValue;
T lastValue;
time_t lastUpdateTimestamp;
T deltaValue;
@@ -54,7 +54,7 @@
State* states;
public:
- MultiStateCounter(uint16_t stateCount, const T& emptyValue);
+ MultiStateCounter(uint16_t stateCount, const V& emptyValue);
virtual ~MultiStateCounter();
@@ -66,35 +66,35 @@
* Copies the current state and accumulated times-in-state from the source. Resets
* the accumulated value.
*/
- void copyStatesFrom(const MultiStateCounter<T>& source);
+ void copyStatesFrom(const MultiStateCounter<T, V> &source);
- void setValue(state_t state, const T& value);
+ void setValue(state_t state, const V& value);
/**
* Updates the value by distributing the delta from the previously set value
* among states according to their respective time-in-state.
* Returns the delta from the previously set value.
*/
- const T& updateValue(const T& value, time_t timestamp);
+ const V& updateValue(const V& value, time_t timestamp);
/**
* Updates the value by distributing the specified increment among states according
* to their respective time-in-state.
*/
- void incrementValue(const T& increment, time_t timestamp);
+ void incrementValue(const V& increment, time_t timestamp);
/**
* Adds the specified increment to the value for the current state, without affecting
* the last updated value or timestamp. Ignores partial time-in-state: the entirety of
* the increment is given to the current state.
*/
- void addValue(const T& increment);
+ void addValue(const V& increment);
void reset();
uint16_t getStateCount();
- const T& getCount(state_t state);
+ const V& getCount(state_t state);
std::string toString();
@@ -104,27 +104,25 @@
* Returns true iff the combination of previousValue and newValue is valid
* (newValue >= prevValue)
*/
- bool delta(const T& previousValue, const T& newValue, T* outValue) const;
+ bool delta(const T& previousValue, const V& newValue, T* outValue) const;
/**
* Adds value2 to value1 and stores the result in value1. Denominator is
* guaranteed to be non-zero.
*/
- void add(T* value1, const T& value2, const uint64_t numerator,
+ void add(T* value1, const V& value2, const uint64_t numerator,
const uint64_t denominator) const;
-
- std::string valueToString(const T& value) const;
};
// ---------------------- MultiStateCounter Implementation -------------------------
// Since MultiStateCounter is a template, the implementation must be inlined.
-template <class T>
-MultiStateCounter<T>::MultiStateCounter(uint16_t stateCount, const T& emptyValue)
+template <class T, class V>
+MultiStateCounter<T, V>::MultiStateCounter(uint16_t stateCount, const V& emptyValue)
: stateCount(stateCount),
+ emptyValue(emptyValue),
currentState(0),
lastStateChangeTimestamp(-1),
- emptyValue(emptyValue),
lastValue(emptyValue),
lastUpdateTimestamp(-1),
deltaValue(emptyValue),
@@ -136,13 +134,13 @@
}
}
-template <class T>
-MultiStateCounter<T>::~MultiStateCounter() {
+template <class T, class V>
+MultiStateCounter<T, V>::~MultiStateCounter() {
delete[] states;
};
-template <class T>
-void MultiStateCounter<T>::setEnabled(bool enabled, time_t timestamp) {
+template <class T, class V>
+void MultiStateCounter<T, V>::setEnabled(bool enabled, time_t timestamp) {
if (enabled == isEnabled) {
return;
}
@@ -167,8 +165,8 @@
}
}
-template <class T>
-void MultiStateCounter<T>::setState(state_t state, time_t timestamp) {
+template <class T, class V>
+void MultiStateCounter<T, V>::setState(state_t state, time_t timestamp) {
if (isEnabled && lastStateChangeTimestamp >= 0 && lastUpdateTimestamp >= 0) {
// If the update arrived out-of-order, just push back the timestamp to
// avoid having the situation where timeInStateSinceUpdate > timeSinceUpdate
@@ -198,8 +196,8 @@
lastStateChangeTimestamp = timestamp;
}
-template <class T>
-void MultiStateCounter<T>::copyStatesFrom(const MultiStateCounter<T>& source) {
+template <class T, class V>
+void MultiStateCounter<T, V>::copyStatesFrom(const MultiStateCounter<T, V>& source) {
if (stateCount != source.stateCount) {
ALOGE("State count mismatch: %u vs. %u\n", stateCount, source.stateCount);
return;
@@ -214,14 +212,14 @@
lastUpdateTimestamp = source.lastUpdateTimestamp;
}
-template <class T>
-void MultiStateCounter<T>::setValue(state_t state, const T& value) {
+template <class T, class V>
+void MultiStateCounter<T, V>::setValue(state_t state, const V& value) {
states[state].counter = value;
}
-template <class T>
-const T& MultiStateCounter<T>::updateValue(const T& value, time_t timestamp) {
- T* returnValue = &emptyValue;
+template <class T, class V>
+const V& MultiStateCounter<T, V>::updateValue(const V& value, time_t timestamp) {
+ const V* returnValue = &emptyValue;
// If the counter is disabled, we ignore the update, except when the counter got disabled after
// the previous update, in which case we still need to pick up the residual delta.
@@ -250,8 +248,8 @@
}
} else {
std::stringstream str;
- str << "updateValue is called with a value " << valueToString(value)
- << ", which is lower than the previous value " << valueToString(lastValue)
+ str << "updateValue is called with a value " << value
+ << ", which is lower than the previous value " << lastValue
<< "\n";
ALOGE("%s", str.str().c_str());
@@ -276,23 +274,25 @@
return *returnValue;
}
-template <class T>
-void MultiStateCounter<T>::incrementValue(const T& increment, time_t timestamp) {
+template <class T, class V>
+void MultiStateCounter<T, V>::incrementValue(const V& increment, time_t timestamp) {
+// T newValue;
+// newValue = lastValue; // Copy assignment, not initialization.
T newValue = lastValue;
add(&newValue, increment, 1 /* numerator */, 1 /* denominator */);
updateValue(newValue, timestamp);
}
-template <class T>
-void MultiStateCounter<T>::addValue(const T& value) {
+template <class T, class V>
+void MultiStateCounter<T, V>::addValue(const V& value) {
if (!isEnabled) {
return;
}
add(&states[currentState].counter, value, 1 /* numerator */, 1 /* denominator */);
}
-template <class T>
-void MultiStateCounter<T>::reset() {
+template <class T, class V>
+void MultiStateCounter<T, V>::reset() {
lastStateChangeTimestamp = -1;
lastUpdateTimestamp = -1;
for (int i = 0; i < stateCount; i++) {
@@ -301,25 +301,26 @@
}
}
-template <class T>
-uint16_t MultiStateCounter<T>::getStateCount() {
+template <class T, class V>
+uint16_t MultiStateCounter<T, V>::getStateCount() {
return stateCount;
}
-template <class T>
-const T& MultiStateCounter<T>::getCount(state_t state) {
+template <class T, class V>
+const V& MultiStateCounter<T, V>::getCount(state_t state) {
return states[state].counter;
}
-template <class T>
-std::string MultiStateCounter<T>::toString() {
+template <class T, class V>
+std::string MultiStateCounter<T, V>::toString() {
std::stringstream str;
+// str << "LAST VALUE: " << valueToString(lastValue);
str << "[";
for (int i = 0; i < stateCount; i++) {
if (i != 0) {
str << ", ";
}
- str << i << ": " << valueToString(states[i].counter);
+ str << i << ": " << states[i].counter;
if (states[i].timeInStateSinceUpdate > 0) {
str << " timeInStateSinceUpdate: " << states[i].timeInStateSinceUpdate;
}