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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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* SciJava Common shared library for SciJava software.
* %%
* Copyright (C) 2009 - 2017 Board of Regents of the University of
* Wisconsin-Madison, Broad Institute of MIT and Harvard, Max Planck
* Institute of Molecular Cell Biology and Genetics, University of
* Konstanz, and KNIME GmbH.
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* modification, are permitted provided that the following conditions are met:
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* this list of conditions and the following disclaimer.
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package org.scijava.module;
import java.util.List;
import java.util.concurrent.Callable;
import org.scijava.AbstractContextual;
import org.scijava.Cancelable;
import org.scijava.Context;
import org.scijava.app.StatusService;
import org.scijava.event.EventService;
import org.scijava.log.LogService;
import org.scijava.module.event.ModuleCanceledEvent;
import org.scijava.module.event.ModuleExecutedEvent;
import org.scijava.module.event.ModuleExecutingEvent;
import org.scijava.module.event.ModuleFinishedEvent;
import org.scijava.module.event.ModulePostprocessEvent;
import org.scijava.module.event.ModulePreprocessEvent;
import org.scijava.module.event.ModuleStartedEvent;
import org.scijava.module.process.ModulePostprocessor;
import org.scijava.module.process.ModulePreprocessor;
import org.scijava.plugin.Parameter;
/**
* Helper class for executing a {@link Module}, including pre- and
* post-processing and event notification.
*
* This class implements both {@link Runnable} and {@link Callable}, to make it
* easier to invoke in a variety of ways, such as with the
* {@link java.util.concurrent} package.
*
*
* @author Curtis Rueden
*/
public class ModuleRunner extends AbstractContextual implements
Callable, Runnable
{
private final Module module;
private final List pre;
private final List post;
@Parameter(required = false)
private EventService es;
@Parameter(required = false)
private StatusService ss;
@Parameter(required = false)
private LogService log;
public ModuleRunner(final Context context, final Module module,
final List pre,
final List post)
{
setContext(context);
this.module = module;
this.pre = pre;
this.post = post;
}
// -- ModuleRunner methods --
/**
* Feeds the module through the {@link ModulePreprocessor}s.
*
* @return The preprocessor that canceled the execution, or null if all
* preprocessors completed successfully.
*/
public ModulePreprocessor preProcess() {
if (pre == null) return null; // no preprocessors
for (final ModulePreprocessor p : pre) {
p.process(module);
if (es != null) es.publish(new ModulePreprocessEvent(module, p));
if (p.isCanceled()) return p;
}
return null;
}
/** Feeds the module through the {@link ModulePostprocessor}s. */
public void postProcess() {
if (post == null) return; // no postprocessors
for (final ModulePostprocessor p : post) {
p.process(module);
if (es != null) es.publish(new ModulePostprocessEvent(module, p));
}
}
// -- Callable methods --
@Override
public Module call() {
try {
run();
}
catch (final RuntimeException exc) {
if (log != null) log.error("Module threw exception", exc);
throw exc;
}
catch (final Error err) {
if (log != null) log.error("Module threw error", err);
throw err;
}
return module;
}
// -- Runnable methods --
/**
* Executes the module, including pre- and post-processing and event
* notification.
*/
@Override
public void run() {
if (module == null) return;
final String title = module.getInfo().getTitle();
// announce start of execution process
if (ss != null) ss.showStatus("Running command: " + title);
if (es != null) es.publish(new ModuleStartedEvent(module));
// execute preprocessors
final ModulePreprocessor canceler = preProcess();
if (canceler != null) {
// module execution was canceled by preprocessor
final String reason = canceler.getCancelReason();
cancel(reason);
cleanupAndBroadcastCancelation(title, reason);
return;
}
// execute module
if (es != null) es.publish(new ModuleExecutingEvent(module));
module.run();
if (isCanceled()) {
// module execution was canceled by the module itself
cleanupAndBroadcastCancelation(title, getCancelReason());
return;
}
if (es != null) es.publish(new ModuleExecutedEvent(module));
// execute postprocessors
postProcess();
// announce completion of execution process
if (es != null) es.publish(new ModuleFinishedEvent(module));
if (ss != null) ss.showStatus("Command finished: " + title);
}
// -- Helper methods --
private void cleanupAndBroadcastCancelation(final String title,
final String reason)
{
if (ss != null) ss.showStatus("Canceling command: " + title);
module.cancel();
if (es != null) es.publish(new ModuleCanceledEvent(module, reason));
if (ss != null) {
ss.showStatus("Command canceled: " + title);
if (reason != null) ss.warn(reason);
}
}
private boolean isCanceled() {
return module instanceof Cancelable && ((Cancelable) module).isCanceled();
}
private String getCancelReason() {
return module instanceof Cancelable ?
((Cancelable) module).getCancelReason() : null;
}
private void cancel(final String reason) {
if (!(module instanceof Cancelable)) return;
((Cancelable) module).cancel(reason);
}
}