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SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.

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/*
 * #%L
 * SciJava Common shared library for SciJava software.
 * %%
 * Copyright (C) 2009 - 2024 SciJava developers.
 * %%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * #L%
 */

package org.scijava.event;

import org.scijava.AbstractContextual;
import org.scijava.util.DebugUtils;

/**
 * Base class for all SciJava events.
 * 
 * @author Curtis Rueden
 */
public abstract class SciJavaEvent extends AbstractContextual {

	/** Whether the event has been handled already. */
	private boolean consumed;

	/** The thread which published this event. */
	private Thread callingThread;

	/** The stack trace of the calling thread when the event was published. */
	private StackTraceElement[] stackTrace;

	// -- SciJavaEvent methods --

	public boolean isConsumed() {
		return consumed;
	}

	public void setConsumed(final boolean consumed) {
		this.consumed = consumed;
	}

	public void consume() {
		setConsumed(true);
	}

	/** Gets the thread that published the event. */
	public Thread getCallingThread() {
		return callingThread;
	}

	/** Sets the thread that published the event. */
	public void setCallingThread(final Thread callingThread) {
		this.callingThread = callingThread;
		stackTrace = callingThread.getStackTrace();
	}

	/**
	 * Gets the stack trace of the calling thread when the event was published.
	 * This method is useful for debugging what triggered an event.
	 */
	public StackTraceElement[] getStackTrace() {
		return stackTrace;
	}

	/**
	 * Gets a stack trace for the calling thread when the event was published.
	 * This method is useful for debugging what triggered an event.
	 */
	public String dumpStack() {
		return DebugUtils.getStackDump(getCallingThread(), getStackTrace());
	}

	// Object methods --

	@Override
	public String toString() {
		return "\n\tcontext = " + getContext() + "\n\tconsumed = " + consumed;
	}

}