[jboss-dev-forums] [Design of POJO Server] - JBVFS-67, VFSCacheFactory.getInstance(String defaultCacheImp
I want to add a VFSCacheFactory.getInstance(String defaultCacheImpl) factory method so we
can set the cache to use in the beans descriptor rather than having to set a system
property. I would say this value takes precedence over the system property:
| public static VFSCache getInstance()
| {
| return getInstance(null);
| }
| public static VFSCache getInstance(String defaultCacheImpl)
| {
| if (instance == null)
| {
| synchronized (lock)
| {
| if (instance == null)
| instance = AccessController.doPrivileged(new
VFSCacheCreatorAction(defaultCacheImpl));
| }
| }
| return instance;
| }
|
| private static class VFSCacheCreatorAction implements
PrivilegedAction<VFSCache>
| {
| private String defaultCacheImpl;
| VFSCacheCreatorAction(String defaultCacheImpl)
| {
| this.defaultCacheImpl = defaultCacheImpl;
| }
|
| public VFSCache run()
| {
| try
| {
| String className = defaultCacheImpl;
| if(className == null)
| className = System.getProperty(VFSUtils.VFS_CACHE_KEY);
| if (className != null)
| {
| log.info("Initializing VFSCache [" + className + "]
...");
| ClassLoader cl = VFSCacheFactory.class.getClassLoader();
| Class<?> clazz = cl.loadClass(className);
| VFSCache cache = VFSCache.class.cast(clazz.newInstance());
| cache.start(); // start here, so we fall back to default no-op in case
start fails
| log.info("Using VFSCache [" + cache + "] ...");
| return cache;
| }
| }
| catch (Throwable t)
| {
| log.warn("Exception instantiating VFS cache: " + t);
| }
| log.info("Using VFSCache [NoopVFSCache] ...");
| return new NoopVFSCache();
| }
| }
|
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