org.glite.security.voms.admin.operations.util.CurrentAdminPermissionCache.java Source code

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Here is the source code for org.glite.security.voms.admin.operations.util.CurrentAdminPermissionCache.java

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/**
 * Copyright (c) Istituto Nazionale di Fisica Nucleare (INFN). 2006-2016
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.glite.security.voms.admin.operations.util;

import java.util.Map;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;

import org.glite.security.voms.admin.operations.CurrentAdmin;
import org.glite.security.voms.admin.operations.VOMSContext;
import org.glite.security.voms.admin.operations.VOMSPermission;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.CacheStats;
import com.google.common.cache.LoadingCache;

public enum CurrentAdminPermissionCache {

    INSTANCE;

    private Logger log = LoggerFactory.getLogger(CurrentAdminPermissionCache.class);

    private LoadingCache<PermissionCheck, Boolean> cache;

    private CurrentAdminPermissionCache() {
        cache = CacheBuilder.newBuilder().maximumSize(1000).expireAfterWrite(5, TimeUnit.MINUTES).recordStats()
                .build(new CheckResultCacheLoader());
    }

    public boolean hasPermission(CurrentAdmin admin, VOMSContext c, VOMSPermission p) throws ExecutionException {

        PermissionCheck key = PermissionCheckImpl.instance(admin, c, p);
        return cache.get(key);
    }

    public void clean() {
        log.debug("Cleaning cache");
        cache.invalidateAll();
    }

    static class CheckResultCacheLoader extends CacheLoader<PermissionCheck, Boolean> {

        private static final Logger LOG = LoggerFactory.getLogger(CheckResultCacheLoader.class);

        @Override
        public Boolean load(PermissionCheck key) throws Exception {

            boolean result = key.getAdmin().checkPermission(key.getContext(), key.getPermission());

            if (LOG.isDebugEnabled()) {
                LOG.debug("Permission check result: {} -> {}", key, result);
            }

            return result;
        }

    }

    public CacheStats stats() {
        return cache.stats();
    }

    public void dumpToLog() {
        log.debug("Cache size: {}", cache.size());
        log.debug("Cache dump:");
        for (Map.Entry<PermissionCheck, Boolean> e : cache.asMap().entrySet()) {
            log.debug("{} -> {}", e.getKey(), e.getValue());
        }
    }

}