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package com.sun.enterprise.security;
import java.security.CodeSource;
import java.security.Permission;
import java.security.Policy;
import java.util.Hashtable;
import java.util.Iterator;
/**
* This class is the factory for creating and managing PermissionCache.
* @author Shing Wai Chan
*/
public class PermissionCacheFactory {
private static final Hashtable cacheMap = new Hashtable();
private static int factoryKey = 0;
private static boolean supportsReuse = false;
private static Permission[] protoPerms = {
new java.net.SocketPermission("localhost","connect"),
new java.util.PropertyPermission("x","read")
};
private static PermissionCache securityManagerCache =
createSecurityManagerCache();
static {
try {
// make a call to policy.refresh() to see if the provider
// calls the supportsReuse callback (see resetCaches below).
// which will set supportsReuse to true (to enable caching).
Policy policy = Policy.getPolicy();
if (policy != null) {
policy.refresh();
}
} catch(Exception pe) {
}
}
/**
* Reserve the next Cache Key for subsequent registration.
* @return the key as an Integer object.
*/
private static Integer getNextKey() {
Integer key = Integer.valueOf(factoryKey++);
while (cacheMap.get(key) != null) {
key = Integer.valueOf(factoryKey++);
}
return key;
}
private static synchronized PermissionCache createSecurityManagerCache() {
Integer key = getNextKey();
PermissionCache cache =
new PermissionCache(key, null, null, protoPerms, null);
return registerPermissionCache(cache);
}
/**
* Create a PermissionCache object.
* If the corresponding object exists, then it will overwrite the
* previous one.
* @param pcID - a string identifying the policy context and which must
* be set when getPermissions is called (internally).
* This value may be null, in which case the permisions of
* the default policy context will be cached.
* @param codesource - the codesource argument to be used in the call
* to getPermissions. This value may be null.
* @param perms - an array of Permission objects identifying the
* permission types that will be managed by the cache.
* This value may be null, in which case all permissions
* obtained by the getPermissions call will be cached.
* @param name - a string corresponding to a value returned by
* Permission.getName() only permissions whose getName()
* value matches the name parameter will be included
* in the cache. This value may be null, in which case
* permission name dos not factor into the
* permission caching.
*/
public static synchronized PermissionCache
createPermissionCache(String pcID,
CodeSource codesource, Permission[] perms, String name) {
if (!supportsReuse) {
return null;
}
Integer key = getNextKey();
PermissionCache cache =
new PermissionCache(key, pcID, codesource, perms, name);
return registerPermissionCache(cache);
}
/**
* Create a PermissionCache object.
* If the corresponding object exists, then it will overwrite the
* previous one.
* @param pcID - a string identifying the policy context and which must
* be set when getPermissions is called (internally).
* This value may be null, in which case the permisions of
* the default policy context will be cached.
* @param codesource - the codesource argument to be used in the call
* to getPermissions. This value may be null.
* @param clazz - a class object identifying the
* permission type that will be managed by the cache.
* This value may be null, in which case all permissions
* obtained by the getPermissions call will be cached.
* @param name - a string corresponding to a value returned by
* Permission.getName() only permissions whose getName()
* value matches the name parameter will be included
* in the cache. This value may be null, in which case
* permission name dos not factor into the
* permission caching.
*/
public static synchronized PermissionCache
createPermissionCache(String pcID,
CodeSource codesource, Class clazz, String name) {
if (!supportsReuse) {
return null;
}
Integer key = getNextKey();
PermissionCache cache =
new PermissionCache(key, pcID, codesource, clazz, name);
return registerPermissionCache(cache);
}
/**
* Register a PermissionCache object with the factory. If an object is
* already registered at the key, it will be overidden.
* @param cache a cache with an internal key value.
* @return the cache object
*/
private static PermissionCache
registerPermissionCache(PermissionCache cache) {
cacheMap.put(cache.getFactoryKey(),cache);
return cache;
}
public static synchronized PermissionCache
removePermissionCache(PermissionCache cache) {
PermissionCache rvalue = null;
if (cache != null) {
Object value = cacheMap.remove(cache.getFactoryKey());
if (value != null && value instanceof PermissionCache) {
rvalue = (PermissionCache) value;
rvalue.reset();
}
}
return rvalue;
}
/**
* This resets all caches inside the factory.
*/
public static synchronized void resetCaches() {
supportsReuse = true;
java.lang.SecurityManager sm = System.getSecurityManager();
if (sm != null && sm instanceof J2EESecurityManager) {
if (!((J2EESecurityManager)sm).cacheEnabled()) {
((J2EESecurityManager)sm).enablePermissionCache
(securityManagerCache);
}
}
Iterator iter = cacheMap.values().iterator();
while (iter.hasNext()) {
Object cache = iter.next();
if (cache instanceof PermissionCache) {
((PermissionCache) cache).reset();
}
}
}
}
