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Prevayler based persistence engine

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/* Copyright (c) Jarek Ratajski, Licensed under the Apache License, Version 2.0
 * http://www.apache.org/licenses/LICENSE-2.0 */
package pl.setblack.airomem.core;

/**
 * Command interface without context.
 * 
 * Enclose all operations that mutate system in commands. This can be easily
 * achieved with lambdas :
 * 
 * Command cmd = system -> system.doSomething();
 *
 * @author jarekr
 */
@FunctionalInterface
public interface Command extends ContextCommand {

    @Override
    default R execute(T system, PrevalanceContext context) {
        return this.execute(system);
    }

    /**
     * This operation will be exectued on system.
     *
     * @param system - reference to mutable system
     */
    R execute(T system);
}