org.italiangrid.storm.webdav.authz.vomap.DefaultVOMembershipProvider.java Source code

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Here is the source code for org.italiangrid.storm.webdav.authz.vomap.DefaultVOMembershipProvider.java

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/**
 * Copyright (c) Istituto Nazionale di Fisica Nucleare, 2014.
 *
 * 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.italiangrid.storm.webdav.authz.vomap;

import java.util.Set;
import java.util.concurrent.locks.ReentrantReadWriteLock;

import org.springframework.util.Assert;

public class DefaultVOMembershipProvider implements VOMembershipProvider, Refreshable {

    private final String voName;
    private final VOMembershipSource membershipSource;
    private long lastRefreshTimestamp = 0L;

    protected ReentrantReadWriteLock refreshLock = new ReentrantReadWriteLock();

    protected Set<String> members = null;

    public DefaultVOMembershipProvider(String voName, VOMembershipSource membershipSource) {

        Assert.hasText(voName, "voName cannot be null or empty!");
        Assert.notNull(membershipSource, "membershipSource cannot be null!");

        this.voName = voName;
        this.membershipSource = membershipSource;
        members = this.membershipSource.getVOMembers();
    }

    @Override
    public String getVOName() {

        return voName;
    }

    @Override
    public boolean hasSubjectAsMember(String subject) {

        refreshLock.readLock().lock();

        try {
            return members.contains(subject);

        } finally {
            refreshLock.readLock().unlock();
            ;
        }
    }

    @Override
    public void refresh() {

        Set<String> newMembers = membershipSource.getVOMembers();

        refreshLock.writeLock().lock();

        lastRefreshTimestamp = System.currentTimeMillis();

        try {
            members = newMembers;

        } finally {
            refreshLock.writeLock().unlock();
        }
    }

    @Override
    public long getLastRefreshTime() {

        return lastRefreshTimestamp;
    }

}