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package com.c2kernel.persistency;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import com.c2kernel.entity.C2KLocalObject;
public class MemoryOnlyClusterStorage extends ClusterStorage {
HashMap<Integer, Map<String, C2KLocalObject>> memoryCache = new HashMap<Integer, Map<String, C2KLocalObject>>();
/**
*
*/
public MemoryOnlyClusterStorage() {
memoryCache = new HashMap<Integer, Map<String,C2KLocalObject>>();
}
@Override
public void open() 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(Integer sysKey, String path)
throws ClusterStorageException {
Map<String, C2KLocalObject> sysKeyMemCache = memoryCache.get(sysKey);
if (sysKeyMemCache != null)
return sysKeyMemCache.get(path);
return null;
}
@Override
public void put(Integer sysKey, C2KLocalObject obj)
throws ClusterStorageException {
// create item cache if not present
Map<String, C2KLocalObject> sysKeyMemCache;
synchronized (memoryCache) {
if (memoryCache.containsKey(sysKey))
sysKeyMemCache = memoryCache.get(sysKey);
else {
sysKeyMemCache = new HashMap<String, C2KLocalObject>();
memoryCache.put(sysKey, sysKeyMemCache);
}
}
// store object in the cache
String path = ClusterStorage.getPath(obj);
synchronized(sysKeyMemCache) {
sysKeyMemCache.put(path, obj);
}
}
@Override
public void delete(Integer sysKey, String path)
throws ClusterStorageException {
Map<String, C2KLocalObject> sysKeyMemCache = memoryCache.get(sysKey);
if (sysKeyMemCache != null) {
synchronized (sysKeyMemCache) {
if (sysKeyMemCache.containsKey(path)) {
sysKeyMemCache.remove(path);
if (sysKeyMemCache.isEmpty()) {
synchronized (memoryCache) {
memoryCache.remove(sysKey);
}
}
}
}
}
}
@Override
public String[] getClusterContents(Integer sysKey, String path)
throws ClusterStorageException {
Map<String, C2KLocalObject> sysKeyMemCache = memoryCache.get(sysKey);
ArrayList<String> result = new ArrayList<String>();
if (sysKeyMemCache != null) {
if (path.endsWith("/"))
path = path.substring(0,path.length()-1);
path = path+"/";
for (String thisPath : sysKeyMemCache.keySet()) {
if (thisPath.startsWith(path)) {
int slash = path.indexOf('/');
String suffix = slash>-1?path.substring(slash+1):path;
if (!result.contains(suffix)) result.add(suffix);
}
}
}
return result.toArray(new String[result.size()]);
}
}
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