Refactor EbeanServerFactory internals - use SpiContainerShutdown interface for container shutdown mechanism

src/main/java/io/ebean/EbeanServerFactory.java

@@ -3,11 +3,12 @@ package io.ebean;
 import io.ebean.common.SpiContainer;
 import io.ebean.config.ContainerConfig;
 import io.ebean.config.ServerConfig;
-import io.ebeaninternal.server.lib.ShutdownManager;
+import io.ebean.service.SpiContainerShutdown;
 
 import javax.persistence.PersistenceException;
 import java.lang.reflect.Constructor;
 import java.util.Properties;
+import java.util.ServiceLoader;
 
 /**
  * Creates EbeanServer instances.
@@ -99,7 +100,9 @@ public class EbeanServerFactory {
    * </p>
    */
   public static synchronized void shutdown() {
-    ShutdownManager.shutdown();
+    for (SpiContainerShutdown shutdown : ServiceLoader.load(SpiContainerShutdown.class)) {
+      shutdown.shutdown();
+    }
   }
 
 

src/main/java/io/ebean/service/SpiContainerShutdown.java

@@ -0,0 +1,12 @@
+package io.ebean.service;
+
+/**
+ * Provides shutdown of the entire container.
+ */
+public interface SpiContainerShutdown {
+
+  /**
+   * Shutdown the entire container - all EbeanServer instances.
+   */
+  void shutdown();
+}

src/main/java/io/ebeaninternal/server/lib/DContainerShutdown.java

@@ -0,0 +1,14 @@
+package io.ebeaninternal.server.lib;
+
+import io.ebean.service.SpiContainerShutdown;
+
+/**
+ * Default container shutdown implementation.
+ */
+public class DContainerShutdown implements SpiContainerShutdown {
+
+  @Override
+  public void shutdown() {
+    ShutdownManager.shutdown();
+  }
+}