rse/plugins/org.eclipse.dltk.rse.ui/src/org/eclipse/dltk/internal/ui/rse/RSEConnectionMonitor.java

package org.eclipse.dltk.internal.ui.rse;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.SubMonitor;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.dltk.core.DLTKCore;
import org.eclipse.dltk.core.IModelElement;
import org.eclipse.dltk.core.IScriptProject;
import org.eclipse.dltk.core.ModelException;
import org.eclipse.dltk.core.environment.EnvironmentManager;
import org.eclipse.dltk.core.environment.IEnvironment;
import org.eclipse.dltk.core.environment.IEnvironmentProvider;
import org.eclipse.dltk.core.internal.rse.RSEEnvironment;
import org.eclipse.dltk.core.internal.rse.RSEEnvironmentProvider;
import org.eclipse.dltk.internal.core.DeltaProcessor;
import org.eclipse.dltk.internal.core.ModelManager;
import org.eclipse.dltk.internal.core.ScriptProject;
import org.eclipse.dltk.internal.core.search.ProjectIndexerManager;
import org.eclipse.rse.core.model.IHost;
import org.eclipse.rse.core.subsystems.CommunicationsEvent;
import org.eclipse.rse.core.subsystems.ICommunicationsListener;
import org.eclipse.rse.core.subsystems.IConnectorService;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.PlatformUI;

/**
 * @since 2.0
 */
public class RSEConnectionMonitor implements Runnable {

	private static final class ProjectUpdateFamily {
		private final RSEEnvironment environment;

		public ProjectUpdateFamily(RSEEnvironment environment) {
			this.environment = environment;
		}

	}

	private static final class ProjectUpdateJob extends Job {

		private final RSEEnvironment environment;

		private ProjectUpdateJob(RSEEnvironment environment) {
			super("Environment configuration changed. Updating projects.");
			this.environment = environment;
		}

		@Override
		protected IStatus run(IProgressMonitor inputMonitor) {
			final SubMonitor monitor = SubMonitor.convert(inputMonitor,
					"Checking projects consistency", 100);
			IProject[] projects = ResourcesPlugin.getWorkspace().getRoot()
					.getProjects();
			List<IScriptProject> projectsToProcess = new ArrayList<IScriptProject>();
			SubMonitor m = monitor.newChild(10);
			m.beginTask("Locate projects for environment", projects.length);
			for (IProject project : projects) {
				if (project.isAccessible()) {
					final String envId = EnvironmentManager.getEnvironmentId(
							project, false);
					if (envId != null) {
						if (envId.equals(environment.getId())) {
							final IScriptProject scriptProject = DLTKCore
									.create(project);
							projectsToProcess.add(scriptProject);
						}

					}
				}
				m.worked(1);
			}
			IEnvironmentProvider provider = EnvironmentManager
					.getEnvironmentProvider(RSEEnvironmentProvider.ID);
			if (provider != null && provider instanceof RSEEnvironmentProvider) {
				((RSEEnvironmentProvider) provider).fireAdded(environment);
			}
			SubMonitor mm = monitor.newChild(20);
			mm.beginTask("Indexing projects", projectsToProcess.size() * 3);
			for (IScriptProject project : projectsToProcess) {
				((ScriptProject) project).updateProjectFragments();
				mm.worked(1);
				try {
					DeltaProcessor processor = ModelManager.getModelManager()
							.getDeltaProcessor();
					processor.clearCustomTimestampsFor(project
							.getProjectFragments());
					processor.checkExternalChanges(
							new IModelElement[] { project }, mm.newChild(1));
				} catch (ModelException e) {
					DLTKCore.error(e);
				}
				ProjectIndexerManager.indexProject(project);
				mm.worked(1);
			}
			mm.done();
			monitor.done();
			return Status.OK_STATUS;
		}

		@Override
		public boolean belongsTo(Object family) {
			return family instanceof ProjectUpdateFamily
					&& environment
							.equals(((ProjectUpdateFamily) family).environment);
		}

	}

	private void updateDecorator() {
		Display display = PlatformUI.getWorkbench().getDisplay();
		if (display.isDisposed()) {
			return;
		}
		display.asyncExec(new Runnable() {
			public void run() {
				if (updatingDecorators) {
					return;
				}
				updatingDecorators = true;
				try {
					PlatformUI.getWorkbench().getDecoratorManager().update(
							RemoteProjectLabelDecorator.ID);
				} finally {
					updatingDecorators = false;
				}
			}
		});
	}

	private boolean updatingDecorators = false;

	private static RSEConnectionMonitor monitor = new RSEConnectionMonitor();

	public static void start() {
		Thread t = new Thread(monitor);
		t.setName("RSE Connection Monitor");
		t.start();
	}

	public void run() {
		EnvironmentManager.waitInitialized();
		final Set<String> eventListenerAdded = new HashSet<String>();
		while (Platform.isRunning()) {

			IEnvironment[] environments = EnvironmentManager.getEnvironments();
			for (final IEnvironment env : environments) {
				if (env instanceof RSEEnvironment) {
					final RSEEnvironment rseENV = (RSEEnvironment) env;
					if (eventListenerAdded.add(rseENV.getId())) {
						// Add connection status listener
						IHost host = rseENV.getHost();
						IConnectorService[] services = host
								.getConnectorServices();
						for (IConnectorService service : services) {
							service
									.addCommunicationsListener(new ICommunicationsListener() {
										public boolean isPassiveCommunicationsListener() {
											return false;
										}

										public void communicationsStateChange(
												CommunicationsEvent e) {
											if (e.getState() == CommunicationsEvent.AFTER_CONNECT) {
												if (rseENV.isConnected()) {
													// Need to update
													// environment.
													rseENV
															.setTryToConnect(true);
													if (Job
															.getJobManager()
															.find(
																	new ProjectUpdateFamily(
																			rseENV)).length == 0) {
														ProjectUpdateJob job = new ProjectUpdateJob(
																rseENV);
														job.setUser(true);
														job.schedule();
													}
												}
											}
											updateDecorator();
										}
									});
						}
					}
				}
			}
			try {
				Thread.sleep(500);
			} catch (InterruptedException e) {
				return;
			}
		}
	}
}