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 * Licensed to the Apache Software Foundation (ASF) under one   *
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 * distributed with this work for additional information        *
 * regarding copyright ownership.  The ASF licenses this file   *
 * to you 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   *
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 * 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       *
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 * under the License.                                           *
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package org.apache.james.mailbox.store.mail;

import org.apache.commons.lang3.NotImplementedException;
import org.apache.james.mailbox.MailboxPathLocker;
import org.apache.james.mailbox.MailboxSession;
import org.apache.james.mailbox.MessageUid;
import org.apache.james.mailbox.exception.MailboxException;
import org.apache.james.mailbox.model.Mailbox;
import org.apache.james.mailbox.model.MailboxId;


/**
 * Abstract base implementation of {@link UidProvider} which used the given {@link MailboxPathLocker} to 
 * lock the {@link Mailbox} while the next uid is generated
 * 
 *
 */
public abstract class AbstractLockingUidProvider implements UidProvider {

    private final MailboxPathLocker locker;

    public AbstractLockingUidProvider(MailboxPathLocker locker) {
        this.locker = locker;
    }
    
    @Override
    public MessageUid nextUid(MailboxSession session, Mailbox mailbox) throws MailboxException {
        boolean writeLock = true;
        return locker.executeWithLock(session, mailbox.generateAssociatedPath(),
            () -> lockedNextUid(session, mailbox),
            writeLock);
    }
    
    /**
     * Generate the next uid to use while the {@link Mailbox} is locked
     */
    protected abstract MessageUid lockedNextUid(MailboxSession session, Mailbox mailbox) throws MailboxException;

    @Override
    public MessageUid nextUid(MailboxSession session, MailboxId mailboxId) {
        throw new NotImplementedException("Not implemented");
    }
}
