112 lines
2.3 KiB
C++
112 lines
2.3 KiB
C++
// Copyright (c) 2011-2016 The Cryptonote developers
|
|
// Distributed under the MIT/X11 software license, see the accompanying
|
|
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
|
|
|
|
#pragma once
|
|
|
|
#include "INode.h"
|
|
#include <mutex>
|
|
#include <condition_variable>
|
|
|
|
namespace CryptoNote {
|
|
|
|
|
|
template <typename T>
|
|
class ObservableValue {
|
|
public:
|
|
ObservableValue(const T defaultValue = 0) :
|
|
m_prev(defaultValue), m_value(defaultValue) {
|
|
}
|
|
|
|
void init(T value) {
|
|
std::lock_guard<std::mutex> lk(m_mutex);
|
|
m_value = m_prev = value;
|
|
}
|
|
|
|
void set(T value) {
|
|
std::lock_guard<std::mutex> lk(m_mutex);
|
|
m_value = value;
|
|
m_cv.notify_all();
|
|
}
|
|
|
|
T get() {
|
|
std::lock_guard<std::mutex> lk(m_mutex);
|
|
return m_value;
|
|
}
|
|
|
|
bool waitFor(std::chrono::milliseconds ms, T& value) {
|
|
std::unique_lock<std::mutex> lk(m_mutex);
|
|
|
|
if (m_cv.wait_for(lk, ms, [this] { return m_prev != m_value; })) {
|
|
value = m_prev = m_value;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
T wait() {
|
|
std::unique_lock<std::mutex> lk(m_mutex);
|
|
|
|
m_cv.wait(lk, [this] { return m_prev != m_value; });
|
|
m_prev = m_value;
|
|
return m_value;
|
|
}
|
|
|
|
private:
|
|
|
|
std::mutex m_mutex;
|
|
std::condition_variable m_cv;
|
|
|
|
T m_prev;
|
|
T m_value;
|
|
};
|
|
|
|
class NodeObserver: public INodeObserver {
|
|
public:
|
|
|
|
NodeObserver(INode& node) : m_node(node) {
|
|
m_knownHeight.init(node.getLastKnownBlockHeight());
|
|
node.addObserver(this);
|
|
}
|
|
|
|
~NodeObserver() {
|
|
m_node.removeObserver(this);
|
|
}
|
|
|
|
virtual void lastKnownBlockHeightUpdated(uint32_t height) override {
|
|
m_knownHeight.set(height);
|
|
}
|
|
|
|
virtual void localBlockchainUpdated(uint32_t height) override {
|
|
m_localHeight.set(height);
|
|
}
|
|
|
|
virtual void peerCountUpdated(size_t count) override {
|
|
m_peerCount.set(count);
|
|
}
|
|
|
|
bool waitLastKnownBlockHeightUpdated(std::chrono::milliseconds ms, uint32_t& value) {
|
|
return m_knownHeight.waitFor(ms, value);
|
|
}
|
|
|
|
bool waitLocalBlockchainUpdated(std::chrono::milliseconds ms, uint32_t& value) {
|
|
return m_localHeight.waitFor(ms, value);
|
|
}
|
|
|
|
uint32_t waitLastKnownBlockHeightUpdated() {
|
|
return m_knownHeight.wait();
|
|
}
|
|
|
|
ObservableValue<uint32_t> m_knownHeight;
|
|
ObservableValue<uint32_t> m_localHeight;
|
|
ObservableValue<size_t> m_peerCount;
|
|
|
|
private:
|
|
|
|
INode& m_node;
|
|
};
|
|
|
|
|
|
}
|