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/*
* Copyright (c) 2018 Eike Stepper (Loehne, Germany) 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:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.emf.cdo.server.spi.evolution;
import org.eclipse.emf.cdo.common.model.EMFUtil;
import org.eclipse.emf.cdo.evolution.Evolution;
import org.eclipse.emf.cdo.evolution.Release;
import org.eclipse.emf.cdo.server.IStore;
import org.eclipse.emf.cdo.server.IStoreAccessor;
import org.eclipse.emf.cdo.spi.common.revision.InternalCDORevisionCache;
import org.eclipse.emf.cdo.spi.common.revision.InternalCDORevisionManager;
import org.eclipse.emf.cdo.view.CDOView;
import org.eclipse.net4j.util.collection.CollectionUtil;
import org.eclipse.net4j.util.om.OMPlatform;
import org.eclipse.net4j.util.om.monitor.OMMonitor;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EPackage;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.util.EcoreUtil;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* @author Eike Stepper
*/
public abstract class AbstractMigrationContext implements MigrationContext
{
public static final int LATEST_RELEASE_VERSION = -1;
private static final String PROP_RELEASE_VERSION = "org.eclipse.emf.cdo.server.evolution.releaseVersion";
private static final Set<String> PROPS = CollectionUtil.setOf(PROP_RELEASE_VERSION);
private static final boolean ALWAYS_RESET = OMPlatform.INSTANCE.isProperty("org.eclipse.emf.cdo.server.evolution.AbstractMigrationContext.alwaysReset");
private final Evolution evolution;
private final Release newRelease;
/**
*
* @param evolutionURI the <code>URI</code> of the evolution resource,
* or <code>null</code> to request deletion of the migration properties
* from the {@link IStore store}.
* @param releaseVersion the version of the release to migrate to, or any value if the <code>evolutionURI</code>
* parameter is null.
*/
public AbstractMigrationContext(URI evolutionURI, int releaseVersion)
{
if (evolutionURI != null)
{
evolution = loadEvolution(evolutionURI);
if (releaseVersion == LATEST_RELEASE_VERSION)
{
Release latestRelease = evolution.getLatestRelease();
releaseVersion = latestRelease == null ? 0 : latestRelease.getVersion();
}
newRelease = evolution.getRelease(releaseVersion);
if (newRelease == null)
{
throw new IllegalArgumentException("Release v" + releaseVersion + " does not exist");
}
controlRootPackages();
}
else
{
evolution = null;
newRelease = null;
}
}
public AbstractMigrationContext(Release release)
{
newRelease = release;
if (newRelease != null)
{
evolution = newRelease.getEvolution();
controlRootPackages();
}
else
{
evolution = null;
}
}
public boolean migrate(EvolutionSupport evolutionSupport, OMMonitor monitor)
{
String repositoryName = evolutionSupport.getStore().getRepository().getName();
if (evolution == null)
{
deleteReleaseVersion(evolutionSupport);
log("Migration properties of " + repositoryName + " deleted");
return true;
}
if (ALWAYS_RESET)
{
deleteReleaseVersion(evolutionSupport);
}
int oldVersion = readReleaseVersion(evolutionSupport);
Release[] releases = computeReleases(oldVersion);
if (releases.length == 0)
{
log("Migration of " + repositoryName + " not needed");
return false;
}
monitor.begin(releases.length);
try
{
InternalCDORevisionCache revisionCache = ((InternalCDORevisionManager)evolutionSupport.getStore().getRepository().getRevisionManager()).getCache();
for (Release toRelease : releases)
{
int toVersion = toRelease.getVersion();
String msg = repositoryName + (oldVersion == 0 ? "" : " from release v" + oldVersion) + " to release v" + toVersion;
log("Migrating " + msg);
evolutionSupport.migrateTo(toRelease, this, monitor.fork());
revisionCache.clear();
writeReleaseVersion(evolutionSupport, toVersion);
log("Migrated " + msg);
log("");
oldVersion = toVersion;
}
return true;
}
finally
{
monitor.done();
}
}
/**
* Moves each root package of the new release into its own resource with the {@link EPackage#getNsURI() nsURI},
* such that {@link EcoreUtil#getURI(org.eclipse.emf.ecore.EObject) EcoreUtil.getURI(modelElement)} returns a
* URI that starts with the nsURI of the rootPackage.
*/
protected void controlRootPackages()
{
Resource releaseResource = newRelease.eResource();
ResourceSet resourceSet = releaseResource.getResourceSet();
for (EPackage rootPackage : newRelease.getRootPackages())
{
if (rootPackage.eResource() == releaseResource)
{
URI nsURI = URI.createURI(rootPackage.getNsURI());
Resource resource = resourceSet.createResource(nsURI);
resource.getContents().add(rootPackage);
}
}
}
protected Evolution loadEvolution(URI evolutionURI)
{
ResourceSet resourceSet = EMFUtil.newEcoreResourceSet();
Resource resource = resourceSet.getResource(evolutionURI, true);
Evolution evolution = (Evolution)resource.getContents().get(0);
CDOView view = evolution.cdoView();
if (view != null)
{
// TODO Create temp resource set? Copy models?
evolution = EcoreUtil.copy(evolution);
view.getSession().close();
}
return evolution;
}
protected Release[] computeReleases(int oldVersion)
{
List<Release> releases = new ArrayList<Release>();
Release oldRelease = oldVersion == 0 ? null : evolution.getRelease(oldVersion);
for (Release fromRelease = oldRelease; oldVersion < newRelease.getVersion();)
{
Release toRelease = fromRelease == null ? evolution.getInitialRelease() : fromRelease.getNextRelease();
releases.add(toRelease);
fromRelease = toRelease;
oldVersion = fromRelease.getVersion();
}
return releases.toArray(new Release[releases.size()]);
}
protected int readReleaseVersion(IStoreAccessor accessor)
{
IStore store = accessor.getStore();
Map<String, String> properties = store.getPersistentProperties(PROPS);
String currentVersion = properties.get(PROP_RELEASE_VERSION);
return currentVersion == null ? 0 : Integer.parseInt(currentVersion);
}
protected void writeReleaseVersion(IStoreAccessor accessor, int releaseVersion)
{
Map<String, String> properties = new HashMap<String, String>();
properties.put(PROP_RELEASE_VERSION, Integer.toString(releaseVersion));
IStore store = accessor.getStore();
store.setPersistentProperties(properties);
}
protected void deleteReleaseVersion(IStoreAccessor accessor)
{
IStore store = accessor.getStore();
store.removePersistentProperties(PROPS);
}
}
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