Hello App: cache.cpp

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cache.cpp

/**

 * cache.cpp - manage a cache of HelloApp data structures

 *

 * Copyright (c) 2024 HanoverSoft

 * Written by Anthony V. Edwards

 * 820 Churchill Drive, Chapel Hill, NC  27517

 * ave@hanoversoft.net

 *

 * This file is the source (read-write) for these structures:

 *      HelloApp

 */

#include "hello.h"

#include <MAE.h>

// data structure caches

Cache<HelloApp> HelloCache;

// Used in mgmtHello.cpp, queryable by supervisor daemon

string CacheList= "User";           // the list of parameter categories

int HelloCache_max= User_CACHE_MAX; // the maximum size of the session cache

/** Allocate our cache of HelloApp instances.

 * Specify how to manage the cache.

 * @param appname - the app name to use when querying system properties (ignored)

 * @return true upon success, false if any error encounted

 */

bool cacheAlloc(const string & appname)

{

    // initialize the cache sizes

    HelloCache_max= User_CACHE_MAX; //Property::getValueInt(appname, "cache", "Hello", User_CACHE_MAX);

    // specify how this cache should behave

    HelloCache.setReadOnly()            // Don't auto-save anything

             .setFetchDirect()          // If it did fetch anything, fetch it directly from the data store (don't call HelloApp::cache())

             .setSize(HelloCache_max);  // Set the maximum size of the cache (when size exceeded, old instances would be save()ed before deletion)

    // success

    return true;

}