de.mhus.lib.adb.transaction.LockBase Maven / Gradle / Ivy

Go to download
/**
 * Copyright 2018 Mike Hummel
 *
 * 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 de.mhus.lib.adb.transaction;

import java.util.LinkedList;
import java.util.Set;

import de.mhus.lib.adb.DbManager;
import de.mhus.lib.core.MLog;
import de.mhus.lib.errors.TimeoutRuntimeException;

public abstract class LockBase extends MLog {

    private LinkedList nested;

    public LockBase() {}

    public abstract void lock(long timeout) throws TimeoutRuntimeException;

    public abstract void release();

    public abstract DbManager getDbManager();

    public String getName() {
        return toString();
    }

    public synchronized void pushNestedLock(LockBase transaction) {
        if (nested == null) nested = new LinkedList<>();
        nested.add(transaction);
    }

    public LockBase popNestedLock() {
        if (nested == null || nested.size() == 0) return null;
        return nested.removeLast();
    }

    public LockBase getNested() {
        if (nested == null || nested.size() == 0) return null;
        return nested.getLast();
    }

    public abstract Set getLockKeys();
}