com.sun.enterprise.security.jacc.cache.CachedPermissionImpl Maven / Gradle / Ivy

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// Portions Copyright [2018-2019] [Payara Foundation and/or its affiliates]
package com.sun.enterprise.security.jacc.cache;

import java.security.Permission;

/**
 * This class is
 * 
 * @author Ron Monzillo
 */
public class CachedPermissionImpl implements CachedPermission {

    private PermissionCache permissionCache;
    private Permission permission;
    private Epoch epoch;

    public CachedPermissionImpl(PermissionCache permissionCache, Permission permission) {
        this.permissionCache = permissionCache;
        this.permission = permission;
        epoch = new Epoch();
    }

    @Override
    public Permission getPermission() {
        return permission;
    }

    @Override
    public PermissionCache getPermissionCache() {
        return permissionCache;
    }

    // synchronization done in PermissionCache
    @Override
    public boolean checkPermission() {
        if (permissionCache == null) {
            return false;
        }
        
        return permissionCache.checkPermission(permission, epoch);
    }

    // used to hold last result obtained from cache and cache epoch.
    // epoch is used by PermissionCache to determine when result is out of date.
    static class Epoch {

        int epoch;
        boolean granted;

        Epoch() {
            this.epoch = 0;
            this.granted = false;
        }
    }

}