Provide API to run ddl and migration manually (e.g. with offline DB)

ebean-core/src/main/java/io/ebeaninternal/api/SpiDdlGenerator.java

@@ -8,8 +8,14 @@ public interface SpiDdlGenerator {
   /**
    * Generate and run the DDL for drop-all and create-all scripts.
    * <p>
-   * Run based on on property settings for ebean.ddl.generate and ebean.ddl.run etc.
+   * Run based on on property settings for ebean.ddl.generate
    */
-  void execute(boolean online);
+  void generateDdl();
 
+  /**
+   * Runs the created DDL files.
+   * <p>
+   * Run based on on property settings for ebean.ddl.run etc.
+   */
+  void runDdl();
 }

ebean-core/src/main/java/io/ebeaninternal/server/core/DefaultServer.java

@@ -246,7 +246,7 @@ public final class DefaultServer implements SpiServer, SpiEbeanServer {
    */
   public void executePlugins(boolean online) {
     if (!config.isDocStoreOnly()) {
-      ddlGenerator.execute(online);
+      ddlGenerator.generateDdl();
     }
     for (Plugin plugin : serverPlugins) {
       plugin.online(online);
@@ -359,27 +359,54 @@ public final class DefaultServer implements SpiServer, SpiEbeanServer {
     serverCacheManager.enabledRegions(config.getEnabledL2Regions());
   }
 
+
   /**
    * Start any services after registering with the ClusterManager.
    */
   public void start() {
-    if (config.isRunMigration() && TenantMode.DB != config.getTenantMode()) {
-      final AutoMigrationRunner migrationRunner = ServiceUtil.service(AutoMigrationRunner.class);
-      if (migrationRunner == null) {
-        throw new IllegalStateException("No AutoMigrationRunner found. Probably ebean-migration is not in the classpath?");
+
+    // check, if DB is available to run DDL and migration
+    boolean dbAvailable = !config.isDocStoreOnly() 
+        && !config.isDbOffline() 
+        && config.getDataSource() != null
+        && config.getTenantMode().isDdlEnabled();
+
+    if (dbAvailable) {
+      if (config.isDdlRun()) {
+        runDdl();
       }
-      final String dbSchema = config.getDbSchema();
-      if (dbSchema != null) {
-        migrationRunner.setDefaultDbSchema(dbSchema);
+      if (config.isRunMigration()) {
+        runMigration();
       }
-      migrationRunner.setName(config.getName());
-      migrationRunner.setPlatform(config.getDatabasePlatform().getPlatform().base().name().toLowerCase());
-      migrationRunner.loadProperties(config.getProperties());
-      migrationRunner.run(config.getDataSource());
+    } else if (config.isDdlRun() || config.isRunMigration()) {
+      log.warn("There was a request to run DDL or migration, but this is currently not possible, as the database is not available");
     }
     startQueryPlanCapture();
   }
 
+  @Override
+  public void runDdl() {
+    ddlGenerator.runDdl();
+  }
+
+  @Override
+  public void runMigration() {
+    final AutoMigrationRunner migrationRunner = ServiceUtil.service(AutoMigrationRunner.class);
+    if (migrationRunner == null) {
+      throw new IllegalStateException(
+          "No AutoMigrationRunner found. Probably ebean-migration is not in the classpath?");
+    }
+
+    final String dbSchema = config.getDbSchema();
+    if (dbSchema != null) {
+      migrationRunner.setDefaultDbSchema(dbSchema);
+    }
+    migrationRunner.setName(config.getName());
+    migrationRunner.setPlatform(config.getDatabasePlatform().getPlatform().base().name().toLowerCase());
+    migrationRunner.loadProperties(config.getProperties());
+    migrationRunner.run(dataSource());
+  }
+
   private void startQueryPlanCapture() {
     if (config.isQueryPlanCapture()) {
       long secs = config.getQueryPlanCapturePeriodSecs();

ebean-core/src/main/java/io/ebeaninternal/server/core/InternalConfiguration.java

@@ -610,8 +610,13 @@ public final class InternalConfiguration {
     }
 
     @Override
-    public void execute(boolean online) {
-      if (online && ddlRun) {
+    public void generateDdl() {
+      // do nothing
+    }
+    
+    @Override
+    public void runDdl() {
+      if (ddlRun) {
         CoreLog.log.error("Configured to run DDL but ebean-ddl-generator is not in the classpath (or ebean-test in the test classpath?)");
       }
     }