org.kercoin.magrit.core.build.RepositoryGuard.java Source code

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Here is the source code for org.kercoin.magrit.core.build.RepositoryGuard.java

Source

/*
Copyright 2011 Frederic Menou
    
This file is part of Magrit.
    
Magrit is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of
the License, or (at your option) any later version.
    
Magrit is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.
    
You should have received a copy of the GNU Affero General Public
License along with Magrit.
If not, see <http://www.gnu.org/licenses/>.
*/
package org.kercoin.magrit.core.build;

import java.io.File;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

import org.eclipse.jgit.lib.Repository;
import org.kercoin.magrit.core.build.pipeline.CriticalResource;

import com.google.inject.Singleton;

@Singleton
public class RepositoryGuard {

    Map<File, CriticalResource> locks = new HashMap<File, CriticalResource>();

    static class CR implements CriticalResource {

        final Lock l = new ReentrantLock();

        public Lock getLock() {
            return l;
        }

    }

    CriticalResource get(Repository repo) {
        CriticalResource cr = locks.get(repo.getDirectory());
        if (cr == null) {
            cr = new CR();
            locks.put(repo.getDirectory(), cr);
        }
        return cr;
    }

}