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package com.c2kernel.persistency;
import java.util.ArrayList;
import java.util.ConcurrentModificationException;
import java.util.HashMap;
import java.util.Map;
import com.c2kernel.entity.C2KLocalObject;
import com.c2kernel.lookup.ItemPath;
import com.c2kernel.process.auth.Authenticator;
import com.c2kernel.utils.Logger;
public class MemoryOnlyClusterStorage extends ClusterStorage {
HashMap<ItemPath, Map<String, C2KLocalObject>> memoryCache = new HashMap<ItemPath, Map<String, C2KLocalObject>>();
/**
*
*/
public MemoryOnlyClusterStorage() {
memoryCache = new HashMap<ItemPath, Map<String,C2KLocalObject>>();
}
@Override
public void open(Authenticator auth) throws ClusterStorageException {
}
@Override
public void close() throws ClusterStorageException {
}
@Override
public short queryClusterSupport(String clusterType) {
return ClusterStorage.READWRITE;
}
@Override
public String getName() {
return "Memory Cache";
}
@Override
public String getId() {
return "Memory Cache";
}
@Override
public C2KLocalObject get(ItemPath thisItem, String path)
throws ClusterStorageException {
Map<String, C2KLocalObject> sysKeyMemCache = memoryCache.get(thisItem);
if (sysKeyMemCache != null)
return sysKeyMemCache.get(path);
return null;
}
@Override
public void put(ItemPath thisItem, C2KLocalObject obj)
throws ClusterStorageException {
// create item cache if not present
Map<String, C2KLocalObject> sysKeyMemCache;
synchronized (memoryCache) {
if (memoryCache.containsKey(thisItem))
sysKeyMemCache = memoryCache.get(thisItem);
else {
sysKeyMemCache = new HashMap<String, C2KLocalObject>();
memoryCache.put(thisItem, sysKeyMemCache);
}
}
// store object in the cache
String path = ClusterStorage.getPath(obj);
synchronized(sysKeyMemCache) {
sysKeyMemCache.put(path, obj);
}
}
@Override
public void delete(ItemPath thisItem, String path)
throws ClusterStorageException {
Map<String, C2KLocalObject> sysKeyMemCache = memoryCache.get(thisItem);
if (sysKeyMemCache != null) {
synchronized (sysKeyMemCache) {
if (sysKeyMemCache.containsKey(path)) {
sysKeyMemCache.remove(path);
if (sysKeyMemCache.isEmpty()) {
synchronized (memoryCache) {
memoryCache.remove(thisItem);
}
}
}
}
}
}
@Override
public String[] getClusterContents(ItemPath thisItem, String path)
throws ClusterStorageException {
Map<String, C2KLocalObject> sysKeyMemCache = memoryCache.get(thisItem);
ArrayList<String> result = new ArrayList<String>();
if (sysKeyMemCache != null) {
while (path.endsWith("/"))
path = path.substring(0,path.length()-1);
path = path+"/";
for (String thisPath : sysKeyMemCache.keySet()) {
if (thisPath.startsWith(path)) {
String end = thisPath.substring(path.length());
int slash = end.indexOf('/');
String suffix = slash>-1?end.substring(0, slash):end;
if (!result.contains(suffix)) result.add(suffix);
}
}
}
return result.toArray(new String[result.size()]);
}
public void dumpContents(ItemPath thisItem) {
synchronized(memoryCache) {
Logger.msg(0, "Cached Objects of Entity "+thisItem);
Map<String, C2KLocalObject> sysKeyMemCache = memoryCache.get(thisItem);
if (sysKeyMemCache == null) {
Logger.msg(0, "No cache found");
return;
}
try {
synchronized(sysKeyMemCache) {
for (Object name : sysKeyMemCache.keySet()) {
String path = (String) name;
try {
Logger.msg(0, " Path "+path+": "+sysKeyMemCache.get(path).getClass().getName());
} catch (NullPointerException e) {
Logger.msg(0, " Path "+path+": reaped");
}
}
}
} catch (ConcurrentModificationException ex) {
Logger.msg(0, "Cache modified - aborting");
}
}
Logger.msg(0, "Total number of cached entities: "+memoryCache.size());
}
}
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