initial commit

MxlInstanceCache.cpp

@@ -0,0 +1,92 @@
+#include "MxlInstanceCache.hpp"
+
+#if MXL_MULTIVIEWER_ENABLE_MXL_SDK
+
+#include <mxl/mxl.h>
+
+#include <algorithm>
+#include <iostream>
+
+MxlInstanceCache& MxlInstanceCache::instance()
+{
+    static MxlInstanceCache cache;
+    return cache;
+}
+
+MxlInstanceHandle* MxlInstanceCache::acquire(
+    const std::string& domain,
+    bool verbose)
+{
+    for (auto& handle : m_handles)
+    {
+        if (handle.domain == domain)
+        {
+            ++handle.refCount;
+            return &handle;
+        }
+    }
+
+    mxlInstance inst = mxlCreateInstance(domain.c_str(), nullptr);
+    if (!inst)
+    {
+        return nullptr;
+    }
+
+    if (verbose)
+    {
+        std::cerr << "MxlInstanceCache: created instance for domain: "
+                  << domain << std::endl;
+    }
+
+    MxlInstanceHandle handle;
+    handle.instance = inst;
+    handle.domain = domain;
+    handle.refCount = 1;
+
+    m_handles.push_back(handle);
+
+    return &m_handles.back();
+}
+
+void MxlInstanceCache::release(MxlInstanceHandle* handle)
+{
+    if (!handle)
+    {
+        return;
+    }
+
+    --handle->refCount;
+
+    if (handle->refCount <= 0)
+    {
+        mxlDestroyInstance(handle->instance);
+        handle->instance = nullptr;
+
+        m_handles.erase(
+            std::remove_if(
+                m_handles.begin(),
+                m_handles.end(),
+                [](const MxlInstanceHandle& h)
+                { return h.instance == nullptr; }),
+            m_handles.end());
+    }
+}
+
+#else
+
+MxlInstanceCache& MxlInstanceCache::instance()
+{
+    static MxlInstanceCache cache;
+    return cache;
+}
+
+MxlInstanceHandle* MxlInstanceCache::acquire(const std::string&, bool)
+{
+    return nullptr;
+}
+
+void MxlInstanceCache::release(MxlInstanceHandle*)
+{
+}
+
+#endif