Squashed commit of the following:v20130128-050843

304132 - [shared] upgrading shared base causes loss of user installer
plug-ins

commit 8461eae803454c36f6a18013c44e37c20810d141
Merge: 23bc40c c847dee
Author: Pascal Rapicault <pascal@rapicault.net>
Date:   Sun Jan 27 22:11:45 2013 -0500

    Merge branch 'master' into prapicau/sharedInstall-part1

commit 23bc40c4f85b01f37fb0ac23992524a7c8ccd892
Author: Pascal Rapicault (Ericsson) <pascal.rapicault@ericsson.com>
Date:   Sun Jan 27 21:38:07 2013 -0500

    Use constant and fix copyright header

commit bc11d565b32b5b5c8bb5c93e5ea666b1d06b43ff
Author: Pascal Rapicault (Ericsson) <pascal.rapicault@ericsson.com>
Date:   Sun Jan 27 21:33:32 2013 -0500

    Annotate new profile with a base profile timestamp

commit ba4e7abda6e44ad47aead2fade320f9be08b27d5
Author: Pascal Rapicault (Ericsson) <pascal.rapicault@ericsson.com>
Date:   Sun Jan 27 21:32:20 2013 -0500

    Add constants

commit 54c8d356527d1321e25bd837e674b758aa61e248
Author: Krzysztof Daniel <kdaniel@redhat.com>
Date:   Thu Jan 24 13:23:15 2013 +0100

    SimpleConfiguratorImpl refactoring and tests.

commit 6177c466083fb7676ebfe5790bc0951043b3b727
Author: Pascal Rapicault (Ericsson) <pascal.rapicault@ericsson.com>
Date:   Thu Jan 24 11:59:45 2013 -0500

    detection of change in the reconciler

commit f04f46d6d283a6235367872b5eaa7e3e483509ed
Merge: 5243d49 c32f111
Author: Pascal Rapicault <pascal@rapicault.net>
Date:   Thu Jan 24 11:43:01 2013 -0500

    Merge branch 'master' into prapicau/sharedInstall-part1

commit 5243d497142b0f2631bcda8b5fed67d7ce0ddbd5
Author: Pascal Rapicault <pascal@rapicault.net>
Date:   Wed Jan 23 15:26:41 2013 -0500

    always use shared install when the ignoreUserConfig property is set

commit 12eccdad23420e7ba91f99221c852f7e32eb11de
Merge: c68f394 1e9fc23
Author: Pascal Rapicault <pascal@rapicault.net>
Date:   Wed Jan 23 10:29:56 2013 -0500

    Merge branch 'master' into prapicau/sharedInstall-part1

commit c68f394a39c4215ed7ac960495a3c59eb3cf3eee
Author: Pascal Rapicault <pascal@rapicault.net>
Date:   Tue Jan 22 22:24:04 2013 -0500

    Bug 398853 - [UI] installed IU shows as update

commit aa6d632dea7ff54e9ba7c3c7f9f2ecd30afe5906
Author: Pascal Rapicault <pascal@rapicault.net>
Date:   Tue Jan 22 13:50:05 2013 -0500

    Differentiate initial profile creation from reset.

commit 4fb3429ed3fd673d5daf7ca1ce9bf1184a0afcb3
Author: Pascal Rapicault <pascal@rapicault.net>
Date:   Tue Jan 22 13:49:23 2013 -0500

    Only show migration dialog once

commit a34eac29e330a41991d003e2dcd2d8b264d77145
Author: Krzysztof Daniel <kdaniel@redhat.com>
Date:   Mon Jan 21 12:40:36 2013 +0100

    397216: [Shared] Better shared configuration change discovery

    Perform dropins reindexing after master configuration had been changed.

    https://bugs.eclipse.org/bugs/show_bug.cgi?id=397216

commit 6981ca8bd3c1db9ab2dd9484a1f7c8950fcd1abe
Merge: dfec14b 33ca260
Author: Pascal Rapicault <pascal@rapicault.net>
Date:   Mon Jan 21 15:04:28 2013 -0500

    Merge branch 'master' into prapicau/sharedInstall-part1

commit dfec14b67a69b6fa14efb860ef8a986053a58917
Merge: 6067d05 ba5f048
Author: Pascal Rapicault <pascal@rapicault.net>
Date:   Mon Jan 21 11:34:38 2013 -0500

    Merge branch 'master' into prapicau/sharedInstall-part1

commit ba5f048a3ac5563430104adeb173dc4f7dda6eca
Author: Pascal Rapicault <pascal@rapicault.net>
Date:   Mon Jan 21 11:28:20 2013 -0500

    Bug 398539 - Got a NPE trying to add a new update site

commit 6067d05e402fe796debd9d25604cae7026df5b48
Author: Pascal Rapicault <pascal@rapicault.net>
Date:   Fri Jan 18 16:16:18 2013 -0500

    only write timestamp file for shared install

commit 8ab9410d8c797e6a8d2a97e4ba46da3d548440fa
Author: Pascal Rapicault (Ericsson) <pascal.rapicault@ericsson.com>
Date:   Fri Jan 18 13:56:46 2013 -0500

    Cache the fact that the state.properties is missing

commit fefbc5bdec2ce6cdb7fd71b1790bf8abdee8737a
Author: Pascal Rapicault (Ericsson) <pascal.rapicault@ericsson.com>
Date:   Fri Jan 18 13:51:54 2013 -0500

    Fix bug in change detection logic

commit 3de6f8593d5c1b21be3bd21000e34acb945056b1
Author: Pascal Rapicault (Ericsson) <pascal.rapicault@ericsson.com>
Date:   Wed Jan 16 19:50:32 2013 -0500

    Detect changes in the bundles.info

commit 446649c95063dca689f4d2c886b26975a11f3499
Author: Pascal Rapicault <pascal@rapicault.net>
Date:   Tue Jan 15 14:04:57 2013 -0500

    Simple notification to let the user know that the base has changed.

commit e004dc5270abd33a60da9a8d0340409bc8e4a38d
Author: Pascal Rapicault <pascal@rapicault.net>
Date:   Fri Jan 11 14:15:20 2013 +0100

    ignore user config.ini if out of sync with base

commit a0235c0c95b9047e64d6e24c9d8f6b8588087113
Author: Pascal Rapicault (Ericsson) <pascal.rapicault@ericsson.com>
Date:   Wed Dec 12 09:57:36 2012 -0500

    Obtain specific profile state properties without locking

commit 1d0f129ca70716e7a181631e1ba0e71f16e35e08
Author: Pascal Rapicault (Ericsson) <pascal.rapicault@ericsson.com>
Date:   Mon Dec 10 16:06:38 2012 -0500

    Remember the timestamp of the base config.ini

commit 3134caecfd244fd88386f3ce4bd1a6fc71fe8007
Author: Pascal Rapicault (Ericsson) <pascal.rapicault@ericsson.com>
Date:   Wed Dec 5 16:21:50 2012 -0500

    Support to ignore the existing profile if the base has changed

commit 7f0ba4e643f40bc0143617b93b2238388d38216d
Author: Pascal Rapicault (Ericsson) <pascal.rapicault@ericsson.com>
Date:   Tue Dec 4 11:23:37 2012 -0500

    Remove externalization warning

3 files changed, 139 insertions, 34 deletions

diff --git a/bundles/org.eclipse.equinox.p2.engine/src/org/eclipse/equinox/internal/p2/engine/SimpleProfileRegistry.java b/bundles/org.eclipse.equinox.p2.engine/src/org/eclipse/equinox/internal/p2/engine/SimpleProfileRegistry.java
index 945ec048e..9e0265404 100644
--- a/bundles/org.eclipse.equinox.p2.engine/src/org/eclipse/equinox/internal/p2/engine/SimpleProfileRegistry.java
+++ b/bundles/org.eclipse.equinox.p2.engine/src/org/eclipse/equinox/internal/p2/engine/SimpleProfileRegistry.java
@@ -1,12 +1,12 @@
 /*******************************************************************************
- * Copyright (c) 2007, 2012 IBM Corporation and others. All rights reserved. This
+ * Copyright (c) 2007, 2013 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
- *     Ericsson AB (Pascal Rapicault) - reading preferences from base in shared install
+ *     Ericsson AB - ongoing development
  ******************************************************************************/
 package org.eclipse.equinox.internal.p2.engine;
 
@@ -38,6 +38,8 @@ import org.xml.sax.SAXException;
 
 public class SimpleProfileRegistry implements IProfileRegistry, IAgentService {
 
+	private static final String SIMPLE_PROFILE_REGISTRY_INTERNAL = "_simpleProfileRegistry_internal_";
+	private static final String ECLIPSE_IGNORE_USER_CONFIGURATION = "eclipse.ignoreUserConfiguration"; //$NON-NLS-1$
 	private static final String PROFILE_REGISTRY = "profile registry"; //$NON-NLS-1$
 	private static final String PROFILE_PROPERTIES_FILE = "state.properties"; //$NON-NLS-1$
 
@@ -168,7 +170,7 @@ public class SimpleProfileRegistry implements IProfileRegistry, IAgentService {
 	}
 
 	public synchronized String toString() {
-		return "Profile registry for location: " + store.getAbsolutePath() + "\n" + getProfileMap().toString(); //$NON-NLS-1$
+		return "Profile registry for location: " + store.getAbsolutePath() + "\n" + getProfileMap().toString(); //$NON-NLS-1$ //$NON-NLS-2$
 	}
 
 	public synchronized IProfile getProfile(String id) {
@@ -243,12 +245,57 @@ public class SimpleProfileRegistry implements IProfileRegistry, IAgentService {
 		if (SELF.equals(id))
 			id = self;
 		Profile profile = getProfileMap().get(id);
-		if (profile == null && self != null && self.equals(id))
-			profile = createSurrogateProfile(id);
-
+		if (self != null && self.equals(id)) {
+			boolean resetProfile = false;
+			if (profile != null && ignoreExistingProfile(profile)) {
+				internalSetProfileStateProperty(profile, profile.getTimestamp(), IProfile.STATE_PROP_SHARED_INSTALL, IProfile.STATE_SHARED_INSTALL_VALUE_BEFOREFLUSH);
+				profile = null;
+				resetProfile = true;
+			}
+			if (profile == null) {
+				profile = createSurrogateProfile(id);
+				if (resetProfile) {
+					//Now that we created a new profile. Tag it, override the property and register the timestamp in the agent registry for pickup by other  
+					internalSetProfileStateProperty(profile, profile.getTimestamp(), IProfile.STATE_PROP_SHARED_INSTALL, IProfile.STATE_SHARED_INSTALL_VALUE_NEW);
+					internalSetProfileStateProperty(profile, profile.getTimestamp(), SIMPLE_PROFILE_REGISTRY_INTERNAL + getBaseTimestamp(profile.getProfileId()), getBaseTimestamp(id));
+					System.setProperty(ECLIPSE_IGNORE_USER_CONFIGURATION, "profileFlushed"); //$NON-NLS-1$
+					agent.registerService(SERVICE_SHARED_INSTALL_NEW_TIMESTAMP, Long.toString(profile.getTimestamp()));
+				} else {
+					//This is the first time we create the shared profile. Tag it as such and also remember the timestamp of the base
+					internalSetProfileStateProperty(profile, profile.getTimestamp(), IProfile.STATE_PROP_SHARED_INSTALL, IProfile.STATE_SHARED_INSTALL_VALUE_INITIAL);
+					internalSetProfileStateProperty(profile, profile.getTimestamp(), SIMPLE_PROFILE_REGISTRY_INTERNAL + getBaseTimestamp(profile.getProfileId()), getBaseTimestamp(id));
+				}
+			}
+		}
 		return profile;
 	}
 
+	private boolean ignoreExistingProfile(IProfile profile) {
+		if (!Boolean.TRUE.toString().equalsIgnoreCase(System.getProperty(ECLIPSE_IGNORE_USER_CONFIGURATION)))
+			return false;
+
+		String baseTimestamp = getBaseTimestamp(profile.getProfileId());
+		if (baseTimestamp == null)
+			return false;
+
+		if (internalGetProfileStateProperties(profile, SIMPLE_PROFILE_REGISTRY_INTERNAL + baseTimestamp, false).size() != 0)
+			return false;
+
+		return true;
+	}
+
+	private String getBaseTimestamp(String id) {
+		IProvisioningAgent installer = (IProvisioningAgent) agent.getService(IProvisioningAgent.SHARED_BASE_AGENT);
+		if (installer == null)
+			return null;
+		IProfileRegistry registry = (IProfileRegistry) installer.getService(IProfileRegistry.SERVICE_NAME);
+		long[] revisions = registry.listProfileTimestamps(id);
+		if (revisions.length >= 1) {
+			return Long.toString(revisions[revisions.length - 1]);
+		}
+		return null;
+	}
+
 	private Profile createSurrogateProfile(String id) {
 		if (surrogateProfileHandler == null)
 			return null;
@@ -294,7 +341,7 @@ public class SimpleProfileRegistry implements IProfileRegistry, IAgentService {
 
 	public synchronized void updateProfile(Profile profile) {
 		String id = profile.getProfileId();
-		Profile current = internalGetProfile(id);
+		Profile current = getProfileMap().get(id);
 		if (current == null)
 			throw new IllegalArgumentException(NLS.bind(Messages.profile_does_not_exist, id));
 
@@ -730,7 +777,7 @@ public class SimpleProfileRegistry implements IProfileRegistry, IAgentService {
 	}
 
 	public synchronized boolean isCurrent(IProfile profile) {
-		Profile internalProfile = internalGetProfile(profile.getProfileId());
+		Profile internalProfile = getProfileMap().get(profile.getProfileId());
 		if (internalProfile == null)
 			throw new IllegalArgumentException(NLS.bind(Messages.profile_not_registered, profile.getProfileId()));
 
@@ -833,10 +880,9 @@ public class SimpleProfileRegistry implements IProfileRegistry, IAgentService {
 	}
 
 	public synchronized void unlockProfile(IProfile profile) {
-		Profile internalProfile = internalGetProfile(profile.getProfileId());
-		if (internalProfile == null)
+		if (profile == null)
 			throw new IllegalArgumentException(NLS.bind(Messages.profile_not_registered, profile.getProfileId()));
-		internalUnlockProfile(internalProfile);
+		internalUnlockProfile(profile);
 	}
 
 	private void internalUnlockProfile(IProfile profile) {
@@ -897,6 +943,8 @@ public class SimpleProfileRegistry implements IProfileRegistry, IAgentService {
 
 		// return true if the cached timestamp is the same as the one on disk
 		boolean isCurrent() {
+			if (!file.exists())
+				return true;
 			return file.lastModified() == timestamp;
 		}
 
@@ -936,8 +984,10 @@ public class SimpleProfileRegistry implements IProfileRegistry, IAgentService {
 
 		File file = new File(profileDirectory, PROFILE_PROPERTIES_FILE);
 		Properties properties = new Properties();
-		if (!file.exists())
+		if (!file.exists()) {
+			lastAccessedProperties = new ProfileStateProperties(id, file, properties);
 			return properties;
+		}
 		InputStream input = null;
 		try {
 			input = new BufferedInputStream(new FileInputStream(file));
@@ -1032,22 +1082,30 @@ public class SimpleProfileRegistry implements IProfileRegistry, IAgentService {
 	public IStatus setProfileStateProperties(String id, long timestamp, Map<String, String> propertiesToAdd) {
 		if (id == null || propertiesToAdd == null)
 			throw new NullPointerException();
-		IStatus result = validateState(id, timestamp);
+
+		Profile internalProfile = internalGetProfile(id);
+		return internalSetProfileStateProperties(internalProfile, timestamp, propertiesToAdd);
+	}
+
+	private IStatus internalSetProfileStateProperties(IProfile profile, long timestamp, Map<String, String> propertiesToAdd) {
+		IStatus result = validateState(profile.getProfileId(), timestamp);
 		if (!result.isOK())
 			return result;
-		Profile internalProfile = internalGetProfile(id);
-		lockProfile(internalProfile);
+
+		if (!internalLockProfile(profile))
+			throw new IllegalStateException(Messages.SimpleProfileRegistry_Profile_in_use);
+
 		try {
-			Properties properties = readStateProperties(id);
+			Properties properties = readStateProperties(profile.getProfileId());
 			for (Map.Entry<String, String> entry : propertiesToAdd.entrySet()) {
 				// property key format is timestamp.key
 				properties.put(timestamp + "." + entry.getKey(), entry.getValue()); //$NON-NLS-1$
 			}
-			writeStateProperties(id, properties);
+			writeStateProperties(profile.getProfileId(), properties);
 		} catch (ProvisionException e) {
 			return e.getStatus();
 		} finally {
-			unlockProfile(internalProfile);
+			internalUnlockProfile(profile);
 		}
 		return Status.OK_STATUS;
 	}
@@ -1056,27 +1114,36 @@ public class SimpleProfileRegistry implements IProfileRegistry, IAgentService {
 	 * @see org.eclipse.equinox.p2.engine.IProfileRegistry#setProfileStateProperty(java.lang.String, long, java.lang.String, java.lang.String)
 	 */
 	public IStatus setProfileStateProperty(String id, long timestamp, String key, String value) {
-		if (id == null || key == null || value == null)
+		if (id == null)
+			throw new NullPointerException();
+		return internalSetProfileStateProperty(internalGetProfile(id), timestamp, key, value);
+	}
+
+	private IStatus internalSetProfileStateProperty(IProfile profile, long timestamp, String key, String value) {
+		if (key == null || value == null)
 			throw new NullPointerException();
 		Map<String, String> properties = new HashMap<String, String>();
 		properties.put(key, value);
-		return setProfileStateProperties(id, timestamp, properties);
+
+		return internalSetProfileStateProperties(profile, timestamp, properties);
 	}
 
-	/* (non-Javadoc)
-	 * @see org.eclipse.equinox.p2.engine.IProfileRegistry#getProfileStateProperties(java.lang.String, long)
-	 */
 	public Map<String, String> getProfileStateProperties(String id, long timestamp) {
 		if (id == null)
 			throw new NullPointerException();
+		return internalGetProfileStateProperties(internalGetProfile(id), timestamp, true);
+	}
 
+	private Map<String, String> internalGetProfileStateProperties(IProfile profile, long timestamp, boolean lock) {
 		Map<String, String> result = new HashMap<String, String>();
 		String timestampString = String.valueOf(timestamp);
 		int keyOffset = timestampString.length() + 1;
-		Profile internalProfile = internalGetProfile(id);
-		lockProfile(internalProfile);
+		lock = lock || lastAccessedProperties == null;
+		if (lock)
+			if (!internalLockProfile(profile))
+				throw new IllegalStateException(Messages.SimpleProfileRegistry_Profile_in_use);
 		try {
-			Properties properties = readStateProperties(id);
+			Properties properties = readStateProperties(profile.getProfileId());
 			Iterator<Object> keys = properties.keySet().iterator();
 			while (keys.hasNext()) {
 				String key = (String) keys.next();
@@ -1086,7 +1153,8 @@ public class SimpleProfileRegistry implements IProfileRegistry, IAgentService {
 		} catch (ProvisionException e) {
 			LogHelper.log(e);
 		} finally {
-			unlockProfile(internalProfile);
+			if (lock)
+				internalUnlockProfile(profile);
 		}
 		return result;
 	}
@@ -1098,11 +1166,18 @@ public class SimpleProfileRegistry implements IProfileRegistry, IAgentService {
 		if (id == null || userKey == null)
 			throw new NullPointerException();
 
-		Map<String, String> result = new HashMap<String, String>();
 		Profile internalProfile = internalGetProfile(id);
-		lockProfile(internalProfile);
+		return internalGetProfileStateProperties(internalProfile, userKey, true);
+	}
+
+	private Map<String, String> internalGetProfileStateProperties(IProfile profile, String userKey, boolean lock) {
+		Map<String, String> result = new HashMap<String, String>();
+		lock = lock || lastAccessedProperties == null;
+		if (lock)
+			if (!internalLockProfile(profile))
+				throw new IllegalStateException(Messages.SimpleProfileRegistry_Profile_in_use);
 		try {
-			Properties properties = readStateProperties(id);
+			Properties properties = readStateProperties(profile.getProfileId());
 			Iterator<Object> keys = properties.keySet().iterator();
 			while (keys.hasNext()) {
 				// property key format is timestamp.key
@@ -1115,7 +1190,8 @@ public class SimpleProfileRegistry implements IProfileRegistry, IAgentService {
 		} catch (ProvisionException e) {
 			LogHelper.log(e);
 		} finally {
-			unlockProfile(internalProfile);
+			if (lock)
+				internalUnlockProfile(profile);
 		}
 		return result;
 	}
@@ -1131,7 +1207,9 @@ public class SimpleProfileRegistry implements IProfileRegistry, IAgentService {
 			return Status.OK_STATUS;
 
 		Profile internalProfile = internalGetProfile(id);
-		lockProfile(internalProfile);
+		if (!internalLockProfile(internalProfile))
+			throw new IllegalStateException(Messages.SimpleProfileRegistry_Profile_in_use);
+
 		try {
 			Properties properties = readStateProperties(id);
 			String timestampString = String.valueOf(timestamp);
@@ -1154,7 +1232,7 @@ public class SimpleProfileRegistry implements IProfileRegistry, IAgentService {
 		} catch (ProvisionException e) {
 			return e.getStatus();
 		} finally {
-			unlockProfile(internalProfile);
+			internalUnlockProfile(internalProfile);
 		}
 		return Status.OK_STATUS;
 	}
diff --git a/bundles/org.eclipse.equinox.p2.engine/src/org/eclipse/equinox/p2/engine/IProfile.java b/bundles/org.eclipse.equinox.p2.engine/src/org/eclipse/equinox/p2/engine/IProfile.java
index 1f8de7645..7bd0060c2 100644
--- a/bundles/org.eclipse.equinox.p2.engine/src/org/eclipse/equinox/p2/engine/IProfile.java
+++ b/bundles/org.eclipse.equinox.p2.engine/src/org/eclipse/equinox/p2/engine/IProfile.java
@@ -7,6 +7,7 @@
  * 
  *  Contributors:
  *     IBM Corporation - initial API and implementation
+ *     Ericsson AB - ongoing development
  *******************************************************************************/
 package org.eclipse.equinox.p2.engine;
 
@@ -146,6 +147,29 @@ public interface IProfile extends IQueryable<IInstallableUnit> {
 	public static final String STATE_PROP_TAG = "org.eclipse.equinox.p2.state.tag"; //$NON-NLS-1$
 
 	/**
+	 * Profile state metadata property key used to represent the state of the user profile when running in shared install.
+	 * The value for this property could be:  {@value #STATE_PROP_INITIAL}, {@value #STATE_SHARED_INSTALL_VALUE_BEFOREFLUSH}, or {@value #STATE_SHARED_INSTALL_VALUE_NEW}
+	 * @since 2.3
+	 */
+	public static final String STATE_PROP_SHARED_INSTALL = "org.eclipse.equinox.p2.state.shared"; //$NON-NLS-1$
+
+	/**
+	 * Value to represent a user profile the first time it is created.
+	 * @since 2.3
+	 */
+	public static final String STATE_SHARED_INSTALL_VALUE_INITIAL = "initial"; //$NON-NLS-1$
+	/**
+	 * Value to represent a user profile before it is being flushed because the base had changed.
+	 * @since 2.3
+	 */
+	public static final String STATE_SHARED_INSTALL_VALUE_BEFOREFLUSH = "beforeFlush"; //$NON-NLS-1$
+	/**
+	 * Value to represent the new user profile created once the base profile has been flushed.
+	 * @since 2.3
+	 */
+	public static final String STATE_SHARED_INSTALL_VALUE_NEW = "new"; //$NON-NLS-1$
+
+	/**
 	 * Profile property constant for additional parameters of the downloading stats(e.g., package=jee&os=linux).
 	 * @since 2.2 
 	 */
diff --git a/bundles/org.eclipse.equinox.p2.engine/src/org/eclipse/equinox/p2/engine/IProfileRegistry.java b/bundles/org.eclipse.equinox.p2.engine/src/org/eclipse/equinox/p2/engine/IProfileRegistry.java
index 381a61e20..b2490c894 100644
--- a/bundles/org.eclipse.equinox.p2.engine/src/org/eclipse/equinox/p2/engine/IProfileRegistry.java
+++ b/bundles/org.eclipse.equinox.p2.engine/src/org/eclipse/equinox/p2/engine/IProfileRegistry.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2007, 2011 IBM Corporation and others.
+ * Copyright (c) 2007, 2013 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
@@ -7,6 +7,7 @@
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
+ *     Ericsson AB - ongoing development
  *******************************************************************************/
 package org.eclipse.equinox.p2.engine;
 
@@ -37,6 +38,8 @@ public interface IProfileRegistry {
 	 */
 	public static final String SERVICE_NAME = IProfileRegistry.class.getName();
 
+	public static final String SERVICE_SHARED_INSTALL_NEW_TIMESTAMP = IProfileRegistry.class.getName() + '_' + "NEW_SELF_TIMESTAMP"; //$NON-NLS-1$
+
 	/**
 	 * Return the profile in the registry that has the given id. If it does not exist, 
 	 * then return <code>null</code>.