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/*******************************************************************************
 * Copyright (c) 2000, 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.debug.core.model;


import org.eclipse.debug.core.DebugException;

/**
 * Provides the ability to suspend and resume a thread
 * or debug target.
 * <p>
 * Clients may implement this interface.
 * </p>
 */
public interface ISuspendResume {
	/**
	 * Returns whether this element can currently be resumed.
	 *
	 * @return whether this element can currently be resumed
	 */
	boolean canResume();
	/**
	 * Returns whether this element can currently be suspended.
	 *
	 * @return whether this element can currently be suspended
	 */
	boolean canSuspend();
	/**
	 * Returns whether this element is currently suspended.
	 *
	 * @return whether this element is currently suspended
	 */
	boolean isSuspended();
	/**
	 * Causes this element to resume its execution, generating a <code>RESUME</code> event.
	 * Has no effect on an element that is not suspended. This call is non-blocking.
	 *
	 * @exception DebugException on failure. Reasons include:<ul>
	 * <li>TARGET_REQUEST_FAILED - The request failed in the target
	 * <li>NOT_SUPPORTED - The capability is not supported by the target
	 * </ul>
	 */
	void resume() throws DebugException;
	/**
	 * Causes this element to suspend its execution, generating a <code>SUSPEND</code> event.
	 * Has no effect on an already suspended element.
	 * Implementations may be blocking or non-blocking.
	 *
	 * @exception DebugException on failure. Reasons include:<ul>
	 * <li>TARGET_REQUEST_FAILED - The request failed in the target
	 * <li>NOT_SUPPORTED - The capability is not supported by the target
	 * </ul>
	 */
	void suspend() throws DebugException;
}

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