* The beginnings of an activity monitor application. Very bare and feature-less

right now, but it's already working (and shows that we better compute our
  system_info::cached_pages field directly).
* I am not sure if we want to keep this app here, merge it with
  ProcessController, or have it as a separate (3rdparty) app. Opinions welcome.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24846 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/apps/activitymonitor/DataSource.h

@@ -0,0 +1,115 @@
+/*
+ * Copyright 2008, Axel Dörfler, [email protected]. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef DATA_SOURCE_H
+#define DATA_SOURCE_H
+
+
+#include <InterfaceDefs.h>
+
+class BString;
+class SystemInfo;
+
+
+class DataSource {
+public:
+						DataSource(int64 initialMin, int64 initialMax);
+						DataSource();
+						DataSource(const DataSource& other);
+	virtual				~DataSource();
+
+	virtual DataSource*	Copy() const;
+
+			int64		Minimum() const;
+			int64		Maximum() const;
+			bigtime_t	RefreshInterval() const;
+
+	virtual void		SetLimits(int64 min, int64 max);
+	virtual void		SetRefreshInterval(bigtime_t interval);
+	virtual void		SetColor(rgb_color color);
+
+	virtual	int64		NextValue(SystemInfo& info);
+	virtual void		Print(BString& text, int64 value) const;
+
+	virtual const char*	Label() const;
+	virtual const char*	Unit() const;
+	virtual rgb_color	Color() const;
+	virtual bool		AdaptiveScale() const;
+
+	static int32		CountSources();
+	static const DataSource* SourceAt(int32 index);
+
+protected:
+	int64				fMinimum;
+	int64				fMaximum;
+	bigtime_t			fInterval;
+	rgb_color			fColor;
+};
+
+
+class MemoryDataSource : public DataSource {
+public:
+						MemoryDataSource();
+	virtual				~MemoryDataSource();
+
+	virtual void		Print(BString& text, int64 value) const;
+	virtual const char*	Unit() const;
+};
+
+
+class UsedMemoryDataSource : public MemoryDataSource {
+public:
+						UsedMemoryDataSource();
+	virtual				~UsedMemoryDataSource();
+
+	virtual DataSource*	Copy() const;
+
+	virtual	int64		NextValue(SystemInfo& info);
+	virtual const char*	Label() const;
+};
+
+
+class CachedMemoryDataSource : public MemoryDataSource {
+public:
+						CachedMemoryDataSource();
+	virtual				~CachedMemoryDataSource();
+
+	virtual DataSource*	Copy() const;
+
+	virtual	int64		NextValue(SystemInfo& info);
+	virtual const char*	Label() const;
+};
+
+
+class ThreadsDataSource : public DataSource {
+public:
+						ThreadsDataSource();
+	virtual				~ThreadsDataSource();
+
+	virtual DataSource*	Copy() const;
+
+	virtual	int64		NextValue(SystemInfo& info);
+	virtual const char*	Label() const;
+	virtual bool		AdaptiveScale() const;
+};
+
+
+class CpuUsageDataSource : public DataSource {
+public:
+						CpuUsageDataSource();
+						CpuUsageDataSource(const CpuUsageDataSource& other);
+	virtual				~CpuUsageDataSource();
+
+	virtual DataSource*	Copy() const;
+
+	virtual void		Print(BString& text, int64 value) const;
+	virtual	int64		NextValue(SystemInfo& info);
+	virtual const char*	Label() const;
+
+private:
+	bigtime_t			fPreviousActive;
+	bigtime_t			fPreviousTime;
+};
+
+#endif	// DATA_SOURCE_H