Added 'k, m, g' suffix processing to Config class

Started writing the Cache class.  Mostly stubs right now.

src/Cache.cpp

@@ -0,0 +1,79 @@
+
+#include "Cache.h"
+#include "Config.h"
+#include <iostream>
+#include <syslog.h>
+#include <boost/filesystem.hpp>
+
+using namespace std;
+using namespace boost::filesystem;
+
+namespace storagemanager
+{
+
+Cache::Cache()
+{
+    Config *conf = Config::get();
+
+    string ssize = conf->getValue("Cache", "cache_size");
+    if (ssize.empty()) 
+    {
+        syslog(LOG_CRIT, "Cache/cache_size is not set");
+        throw runtime_error("Please set Cache/cache_size in the storagemanager.cnf file");
+    }
+    try
+    {
+        maxCacheSize = stol(ssize);
+    }
+    catch (invalid_argument &)
+    {
+        syslog(LOG_CRIT, "Cache/cache_size is not a number");
+        throw runtime_error("Please set Cache/cache_size to a number");
+    }
+        
+    prefix = conf->getValue("Cache", "path");
+    if (prefix.empty())
+    {
+        syslog(LOG_CRIT, "Cache/path is not set");
+        throw runtime_error("Please set Cache/path in the storagemanager.cnf file");
+    }
+    try 
+    {
+        boost::filesystem::create_directories(prefix);
+    }
+    catch (exception &e)
+    {
+        syslog(LOG_CRIT, "Failed to create %s, got: %s", prefix.string().c_str(), e.what());
+        throw e;
+    }
+}
+
+Cache::~Cache()
+{
+}
+
+void Cache::read(const vector<string> &keys)
+{
+}
+
+void Cache::exists(const vector<string> &keys, vector<bool> *out)
+{
+}
+
+void Cache::newObject(const string &key, size_t size)
+{
+}
+
+void Cache::deletedObject(const string &key, size_t size)
+{
+}
+
+void Cache::setCacheSize(size_t size)
+{
+}
+
+void Cache::makeSpace(size_t size)
+{
+}
+
+}