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Almost Functional is very low impact functional classes inspired by guava, jdk 1.8 and various others.
/*
* Copyright (c) 2014, [email protected]
*
* Permission to use, copy, modify, and/or distribute this software for any purpose with or
* without fee is hereby granted, provided that the above copyright notice and this permission
* notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR
* ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE
* OR PERFORMANCE OF THIS SOFTWARE.
*/
package almost.functional.reactive;
/**
* An Observer implementation that observes data, errors, and the completion of what is being
* observed. Once the Observer is completed no further observations of any type should be handled.
* @param type being observed.
*/
public interface Observer {
/**
* Observe the completion.
* @param withoutError if completed without error.
*/
void completed(Boolean withoutError);
/**
* Observe each data item made available.
* @param t a data item.
*/
void next(T t);
/**
* Observe an error that occurred. This allows for exceptions without stopping the observations.
* @param e the throwable.
*/
void error(Throwable e);
}