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package org.scijava;

/**
 * An operation that can be canceled.
 * 
 * @author Curtis Rueden
 */
public interface Cancelable {

	/** Gets whether the operation has been canceled. */
	boolean isCanceled();

	/**
	 * Cancels the operation execution, with the given reason for doing so.
	 * <p>
	 * This method merely sets the operation status to canceled; it cannot
	 * necessarily stop the operation itself. That is, it is the responsibility of
	 * each individual operation to check {@link #isCanceled()} in a timely manner
	 * during execution, and stop doing whatever it is doing if the flag has been
	 * tripped.
	 * </p>
	 * 
	 * @param reason A message describing why the operation is being canceled.
	 */
	void cancel(String reason);

	/**
	 * Gets a message describing why the operation was canceled.
	 * 
	 * @return The reason for cancelation, which may be null if no reason was
	 *         given, or if the operation was not in fact canceled.
	 */
	String getCancelReason();

}
