diff options
Diffstat (limited to 'bundles/org.eclipse.wst.sse.core/src/org/eclipse/wst/sse/core/internal/util/AbstractMemoryListener.java')
| -rw-r--r-- | bundles/org.eclipse.wst.sse.core/src/org/eclipse/wst/sse/core/internal/util/AbstractMemoryListener.java | 205 |
1 files changed, 0 insertions, 205 deletions
diff --git a/bundles/org.eclipse.wst.sse.core/src/org/eclipse/wst/sse/core/internal/util/AbstractMemoryListener.java b/bundles/org.eclipse.wst.sse.core/src/org/eclipse/wst/sse/core/internal/util/AbstractMemoryListener.java deleted file mode 100644 index 46c60a85e4..0000000000 --- a/bundles/org.eclipse.wst.sse.core/src/org/eclipse/wst/sse/core/internal/util/AbstractMemoryListener.java +++ /dev/null @@ -1,205 +0,0 @@ -/*******************************************************************************
- * Copyright (c) 2009 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.wst.sse.core.internal.util;
-
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Hashtable;
-import java.util.List;
-
-import org.eclipse.core.runtime.Assert;
-import org.eclipse.core.runtime.Platform;
-import org.eclipse.wst.sse.core.internal.Logger;
-import org.eclipse.wst.sse.core.internal.SSECorePlugin;
-import org.osgi.framework.Bundle;
-import org.osgi.framework.BundleContext;
-import org.osgi.framework.BundleException;
-import org.osgi.framework.ServiceRegistration;
-import org.osgi.service.event.Event;
-import org.osgi.service.event.EventAdmin;
-import org.osgi.service.event.EventConstants;
-import org.osgi.service.event.EventHandler;
-
-/**
- * This responds to memory events.
- *
- * Create an instance of a child of this class with the events you are interested in.
- * Then call connect() to start listening. To stop listening call disconnect();
- */
-public abstract class AbstractMemoryListener implements EventHandler {
- /**
- * The event that indicates that memory is running low at the lowest severity.
- * Listeners are requested to release caches that can easily be recomputed.
- * The Java VM is not seriously in trouble, but process size is getting higher than
- * is deemed acceptable.
- */
- public static final String SEV_NORMAL = "org/eclipse/equinox/events/MemoryEvent/NORMAL"; //$NON-NLS-1$
-
- /**
- * The event that indicates that memory is running low at medium severity.
- * Listeners are requested to release intermediate build results, complex models, etc.
- * Memory is getting low and may cause operating system level stress, such as swapping.
- */
- public static final String SEV_SERIOUS = "org/eclipse/equinox/events/MemoryEvent/SERIOUS"; //$NON-NLS-1$
-
- /**
- * The event that indicates that memory is running low at highest severity.
- * Listeners are requested to do things like close editors and perspectives, close database connections, etc.
- * Restoring these resources and caches constitutes lots of work, but memory is so low that
- * drastic measures are required.
- */
- public static final String SEV_CRITICAL = "org/eclipse/equinox/events/MemoryEvent/CRITICAL"; //$NON-NLS-1$
-
- /**
- * All of the valid memory severities
- */
- public static final String[] SEV_ALL = { SEV_NORMAL, SEV_SERIOUS, SEV_CRITICAL };
-
- /**
- * Used to register the {@link EventAdmin} listener
- */
- private static BundleContext CONTEXT =
- (SSECorePlugin.getDefault() != null) ?
- SSECorePlugin.getDefault().getBundle().getBundleContext() : null;
-
- /**
- * the severities that will be reacted to
- */
- private final List fSeverities;
-
- /**
- * service used to register this listener
- */
- private ServiceRegistration fRegisterService;
-
- /**
- * Will listen to all memory events
- */
- public AbstractMemoryListener() {
- this(AbstractMemoryListener.SEV_ALL);
- }
-
- /**
- * Will listen to memory events of the given <code>severity</code>
- *
- * @param severity listen for memory events of this severity
- */
- public AbstractMemoryListener(String severity) {
- Assert.isNotNull(severity, "Severity can not be null"); //$NON-NLS-1$
-
- List severities = new ArrayList(1);
- severities.add(severity);
- fSeverities = severities;
- }
-
- /**
- * Will listen to memory events of the given <code>severities</code>
- *
- * @param severities listen for memory events for any of these severities
- */
- public AbstractMemoryListener(String[] severities) {
- Assert.isNotNull(severities, "Severities can not be null"); //$NON-NLS-1$
- Assert.isLegal(severities.length > 0, "Severities must specify at least one severity"); //$NON-NLS-1$
-
- fSeverities = Arrays.asList(severities);
- }
-
- /**
- * Will listen to memory events of the given <code>severities</code>
- *
- * @param severities listen for memory events for any of these severities
- */
- public AbstractMemoryListener(List severities) {
- Assert.isNotNull(severities, "Severities can not be null"); //$NON-NLS-1$
- Assert.isLegal(!severities.isEmpty(), "Severities must specify at least one severity"); //$NON-NLS-1$
- fSeverities = severities;
- }
-
- /**
- * Connect this listener to the {@link EventAdmin}
- */
- public final void connect() {
- if (CONTEXT != null) {
- // NOTE: This is TEMPORARY CODE needed to load the plugin
- // until its done automatically by the product
- // TODO: Remove me
- Bundle b = Platform.getBundle("org.eclipse.equinox.event"); //$NON-NLS-1$
- if (b != null && b.getState() == Bundle.RESOLVED) {
- try {
- b.start(Bundle.START_TRANSIENT);
- }
- catch (BundleException e) {
- e.printStackTrace();
- }
- }
- // end remove me
-
- //register this handler
- String[] severities = (String[])fSeverities.toArray(new String[fSeverities.size()]);
- Hashtable prop = new Hashtable(1);
- prop.put(EventConstants.EVENT_TOPIC, severities);
- fRegisterService = CONTEXT.registerService(EventHandler.class.getName(), this, prop);
-
- //call any implementer specific connect code
- doConnect();
- } else {
- Logger.log(Logger.WARNING, "Error accessing bundle context. Is Platform running? Not tracking memory events. "); //$NON-NLS-1$
- }
- }
-
- /**
- * Disconnect this listener to the {@link EventAdmin}
- */
- public final void disconnect() {
- if (fRegisterService != null) {
- fRegisterService.unregister();
- fRegisterService = null;
- }
-
- //call any implementer specific disconnect code
- doDisconnect();
- }
-
- /**
- * <p>Filter out any events that are not of the type that this listener handles</p>
- *
- * @see org.osgi.service.event.EventHandler#handleEvent(org.osgi.service.event.Event)
- */
- public final void handleEvent(Event event) {
- if (fSeverities.contains(event.getTopic())) {
- handleMemoryEvent(event);
- }
- }
-
- /**
- * Implementing child classes may assume that only {@link Event}s of the types
- * given to the constructor will be given to this method.
- *
- * @param event the {@link Event} with a topic equal to one of the memory
- * severities that this listener is listening for
- */
- protected abstract void handleMemoryEvent(Event event);
-
- /**
- * Implementers may overrun this method to do setup after connection of this listener
- */
- protected void doConnect() {
- //do nothing by default
- }
-
- /**
- * Implementers may overrun this method to do tear down after disconnection of this listener
- */
- protected void doDisconnect() {
- //do nothing by default
- }
-}
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