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June 2012

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r2571 - branches/topia-2.6-maintenance/topia-service-migration/src/main/java/org/nuiton/topia/migration
by tchemit＠users.nuiton.org 01 Jun '12

01 Jun '12

Author: tchemit Date: 2012-06-01 11:29:47 +0200 (Fri, 01 Jun 2012) New Revision: 2571 Url: http://nuiton.org/repositories/revision/topia/2571 Log: fixes #2122: Introduce a simplier way of reference migration callback Added: branches/topia-2.6-maintenance/topia-service-migration/src/main/java/org/nuiton/topia/migration/TopiaMigrationCallbackByClassNG.java Copied: branches/topia-2.6-maintenance/topia-service-migration/src/main/java/org/nuiton/topia/migration/TopiaMigrationCallbackByClassNG.java (from rev 2570, branches/topia-2.6-maintenance/topia-service-migration/src/main/java/org/nuiton/topia/migration/TopiaMigrationCallbackByClass.java) =================================================================== --- branches/topia-2.6-maintenance/topia-service-migration/src/main/java/org/nuiton/topia/migration/TopiaMigrationCallbackByClassNG.java (rev 0) +++ branches/topia-2.6-maintenance/topia-service-migration/src/main/java/org/nuiton/topia/migration/TopiaMigrationCallbackByClassNG.java 2012-06-01 09:29:47 UTC (rev 2571) @@ -0,0 +1,194 @@ +/* + * #%L + * ToPIA :: Service Migration + * + * $Id$ + * $HeadURL$ + * %% + * Copyright (C) 2004 - 2010 CodeLutin, Tony chemit + * %% + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as + * published by the Free Software Foundation, either version 3 of the + * License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Lesser Public License for more details. + * + * You should have received a copy of the GNU General Lesser Public + * License along with this program. If not, see + * <http://www.gnu.org/licenses/lgpl-3.0.html>. + * #L% + */ +package org.nuiton.topia.migration; + +import org.apache.commons.logging.Log; +import org.apache.commons.logging.LogFactory; +import org.nuiton.topia.TopiaException; +import org.nuiton.topia.framework.TopiaContextImplementor; +import org.nuiton.util.Version; +import org.nuiton.util.VersionUtil; + +import java.util.ArrayList; +import java.util.List; +import java.util.Map; +import java.util.ServiceLoader; +import java.util.Set; +import java.util.TreeMap; + +/** + * Migration callback which use a different class for each version to migrate. + * <p/> + * You must fill in the constructor the mapping for each version of + * {@link #getAvailableVersions()} a matching migrator for version which + * extends {@link MigrationCallBackForVersion}. + * <p/> + * Use the callback when you have a lot of version to migrate and the + * {@link TopiaMigrationCallbackByMethod} begins to be messy. + * + * @author tchemit <chemit(a)codelutin.com> + * @version $Id$ + * @since 2.9.11 + */ +public abstract class TopiaMigrationCallbackByClassNG extends AbstractTopiaMigrationCallback { + + /** Logger. */ + private static final Log log = + LogFactory.getLog(TopiaMigrationCallbackByClassNG.class); + + protected MigrationCallBackForVersionResolver callBackResolver; + + protected TopiaMigrationCallbackByClassNG(MigrationCallBackForVersionResolver callBackResolver) { + + this.callBackResolver = callBackResolver; + } + + @Override + public Version[] getAvailableVersions() { + Set<Version> allVersions = callBackResolver.getAllVersions(); + return allVersions.toArray(new Version[allVersions.size()]); + } + + @Override + protected void migrateForVersion(Version version, + TopiaContextImplementor tx, + boolean showSql, + boolean showProgression) throws Exception { + + MigrationCallBackForVersion migrator = callBackResolver.getCallBack(version); + + migrator.setCallBack(this); + + String[] queries = migrator.prepareMigration(tx, showSql, showProgression); + + executeSQL(tx, showSql, showProgression, queries); + + } + + /** + * Call back for a given version. + * + * @author tchemit <chemit(a)codelutin.com> + * @since 2.5 + */ + public abstract static class MigrationCallBackForVersion { + + protected TopiaMigrationCallbackByClassNG callBack; + + public abstract Version getVersion(); + + public void setCallBack(TopiaMigrationCallbackByClassNG callBack) { + this.callBack = callBack; + } + + protected String[] prepareMigration(TopiaContextImplementor tx, + boolean showSql, + boolean showProgression) throws TopiaException { + + List<String> queries = new ArrayList<String>(); + + prepareMigrationScript(tx, queries, showSql, showProgression); + + return queries.toArray(new String[queries.size()]); + } + + protected abstract void prepareMigrationScript(TopiaContextImplementor tx, + List<String> queries, + boolean showSql, + boolean showProgression) throws TopiaException; + + public void executeSQL(TopiaContextImplementor tx, + String... sqls) throws TopiaException { + callBack.executeSQL(tx, sqls); + } + + public void executeSQL(TopiaContextImplementor tx, + boolean showSql, + boolean showProgression, + String... sqls) throws TopiaException { + callBack.executeSQL(tx, showSql, showProgression, sqls); + } + + } + + /** + * Resolver to obtain the correct migration class for a given version. + * + * @since 2.6.11 + */ + public interface MigrationCallBackForVersionResolver { + + /** + * Returns all detected versions. + * + * @return all detected versions. + */ + Set<Version> getAllVersions(); + + /** + * for a given version, returns his migration callback. + * + * @param version the version to migrate + * @return the migration call for the given version, or {@code null} + * if no such migration callback exists for the version + */ + MigrationCallBackForVersion getCallBack(Version version); + } + + /** + * A simple call back resolver via a service loader. + * + * @author tchemit <chemit(a)codelutin.com> + * @since 2.9.11 + */ + public static class MigrationCallBackForVersionResolverByServiceLoader implements MigrationCallBackForVersionResolver { + + protected final Map<Version, MigrationCallBackForVersion> versionMigrationMapping; + + public MigrationCallBackForVersionResolverByServiceLoader() { + this.versionMigrationMapping = new TreeMap<Version, MigrationCallBackForVersion>( + new VersionUtil.VersionComparator()); + ServiceLoader<MigrationCallBackForVersion> load = ServiceLoader.load(MigrationCallBackForVersion.class); + for (MigrationCallBackForVersion callBackForVersion : load) { + Version version = callBackForVersion.getVersion(); + if (log.isInfoEnabled()) { + log.info("Detects migration version " + version + " [" + + callBackForVersion + "]"); + } + versionMigrationMapping.put(version, callBackForVersion); + } + } + + @Override + public MigrationCallBackForVersion getCallBack(Version version) { + return versionMigrationMapping.get(version); + } + + @Override + public Set<Version> getAllVersions() { + return versionMigrationMapping.keySet(); + } + } +} \ No newline at end of file

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