summaryrefslogtreecommitdiff
path: root/src/ipa/raspberrypi/controller/metadata.hpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/ipa/raspberrypi/controller/metadata.hpp')
-rw-r--r--src/ipa/raspberrypi/controller/metadata.hpp77
1 files changed, 77 insertions, 0 deletions
diff --git a/src/ipa/raspberrypi/controller/metadata.hpp b/src/ipa/raspberrypi/controller/metadata.hpp
new file mode 100644
index 00000000..1d7624a0
--- /dev/null
+++ b/src/ipa/raspberrypi/controller/metadata.hpp
@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019, Raspberry Pi (Trading) Limited
+ *
+ * metadata.hpp - general metadata class
+ */
+#pragma once
+
+// A simple class for carrying arbitrary metadata, for example about an image.
+
+#include <string>
+#include <mutex>
+#include <map>
+#include <memory>
+
+#include <boost/any.hpp>
+
+namespace RPi {
+
+class Metadata
+{
+public:
+ template<typename T> void Set(std::string const &tag, T const &value)
+ {
+ std::lock_guard<std::mutex> lock(mutex_);
+ data_[tag] = value;
+ }
+ template<typename T> int Get(std::string const &tag, T &value) const
+ {
+ std::lock_guard<std::mutex> lock(mutex_);
+ auto it = data_.find(tag);
+ if (it == data_.end())
+ return -1;
+ value = boost::any_cast<T>(it->second);
+ return 0;
+ }
+ void Clear()
+ {
+ std::lock_guard<std::mutex> lock(mutex_);
+ data_.clear();
+ }
+ Metadata &operator=(Metadata const &other)
+ {
+ std::lock_guard<std::mutex> lock(mutex_);
+ std::lock_guard<std::mutex> other_lock(other.mutex_);
+ data_ = other.data_;
+ return *this;
+ }
+ template<typename T> T *GetLocked(std::string const &tag)
+ {
+ // This allows in-place access to the Metadata contents,
+ // for which you should be holding the lock.
+ auto it = data_.find(tag);
+ if (it == data_.end())
+ return nullptr;
+ return boost::any_cast<T>(&it->second);
+ }
+ template<typename T>
+ void SetLocked(std::string const &tag, T const &value)
+ {
+ // Use this only if you're holding the lock yourself.
+ data_[tag] = value;
+ }
+ // Note: use of (lowercase) lock and unlock means you can create scoped
+ // locks with the standard lock classes.
+ // e.g. std::lock_guard<PisP::Metadata> lock(metadata)
+ void lock() { mutex_.lock(); }
+ void unlock() { mutex_.unlock(); }
+
+private:
+ mutable std::mutex mutex_;
+ std::map<std::string, boost::any> data_;
+};
+
+typedef std::shared_ptr<Metadata> MetadataPtr;
+
+} // namespace RPi