#1063 - Add Event Listeners capable of being notified for delete by id

Adds BeanDeleteIdRequest and adds a method to BeanPersistController and BeanPersistAdapter

src/main/java/io/ebean/event/BeanDeleteIdRequest.java

@@ -0,0 +1,26 @@
+package io.ebean.event;
+
+import io.ebean.EbeanServer;
+import io.ebean.Transaction;
+
+/**
+ * A request to delete a bean by Id value.
+ */
+public interface BeanDeleteIdRequest {
+
+  /**
+   * Return the server processing the request.
+   */
+  EbeanServer getEbeanServer();
+
+  /**
+   * Return the Transaction associated with this request.
+   */
+  Transaction getTransaction();
+
+  /**
+   * Returns the Id value of the bean being deleted.
+   */
+  Object getId();
+
+}

src/main/java/io/ebean/event/BeanPersistAdapter.java

@@ -87,4 +87,11 @@ public abstract class BeanPersistAdapter implements BeanPersistController {
   public void postSoftDelete(BeanPersistRequest<?> request) {
   }
 
+  /**
+   * Does nothing by default.
+   */
+  @Override
+  public void preDelete(BeanDeleteIdRequest request) {
+
+  }
 }

src/main/java/io/ebean/event/BeanPersistController.java

@@ -92,6 +92,11 @@ public interface BeanPersistController {
    */
   boolean preSoftDelete(BeanPersistRequest<?> request);
 
+  /**
+   * Prior to a delete by id perform some action.
+   */
+  void preDelete(BeanDeleteIdRequest request);
+
   /**
    * Called after the insert was performed.
    */

src/main/java/io/ebeaninternal/server/deploy/ChainedBeanPersistController.java

@@ -1,5 +1,6 @@
 package io.ebeaninternal.server.deploy;
 
+import io.ebean.event.BeanDeleteIdRequest;
 import io.ebean.event.BeanPersistController;
 import io.ebean.event.BeanPersistRequest;
 
@@ -147,6 +148,13 @@ public class ChainedBeanPersistController implements BeanPersistController {
     return true;
   }
 
+  @Override
+  public void preDelete(BeanDeleteIdRequest request) {
+    for (BeanPersistController aChain : chain) {
+      aChain.preDelete(request);
+    }
+  }
+
   @Override
   public boolean preInsert(BeanPersistRequest<?> request) {
     for (BeanPersistController aChain : chain) {

src/main/java/io/ebeaninternal/server/persist/DefaultPersister.java

@@ -9,6 +9,7 @@ import io.ebean.bean.BeanCollection;
 import io.ebean.bean.BeanCollection.ModifyListenMode;
 import io.ebean.bean.EntityBean;
 import io.ebean.bean.PersistenceContext;
+import io.ebean.event.BeanPersistController;
 import io.ebeaninternal.api.SpiEbeanServer;
 import io.ebeaninternal.api.SpiTransaction;
 import io.ebeaninternal.api.SpiUpdate;
@@ -718,6 +719,7 @@ public final class DefaultPersister implements Persister {
     }
 
     // use Id's to update L2 cache rather than Bulk table event
+    notifyDeleteById(descriptor, id, idList, transaction);
     deleteById.setAutoTableMod(false);
     if (idList != null) {
       t.getEvent().addDeleteByIdList(descriptor, idList);
@@ -738,6 +740,22 @@ public final class DefaultPersister implements Persister {
     return rows;
   }
 
+  private void notifyDeleteById(BeanDescriptor<?> descriptor, Object id, List<Object> idList, Transaction transaction) {
+
+    BeanPersistController controller = descriptor.getPersistController();
+    if (controller != null) {
+      DeleteIdRequest request = new DeleteIdRequest(server, transaction, id);
+      if (idList == null) {
+        controller.preDelete(request);
+      } else {
+        for (Object idValue : idList) {
+          request.setId(idValue);
+          controller.preDelete(request);
+        }
+      }
+    }
+  }
+
   /**
    * We need to create and execute a query to get the foreign key values as
    * the delete cascades to them (foreign keys).

src/main/java/io/ebeaninternal/server/persist/DeleteIdRequest.java

@@ -0,0 +1,37 @@
+package io.ebeaninternal.server.persist;
+
+import io.ebean.EbeanServer;
+import io.ebean.Transaction;
+import io.ebean.event.BeanDeleteIdRequest;
+import io.ebeaninternal.api.SpiEbeanServer;
+
+class DeleteIdRequest implements BeanDeleteIdRequest {
+
+  private final EbeanServer server;
+  private final Transaction transaction;
+  private Object id;
+
+  DeleteIdRequest(SpiEbeanServer server, Transaction transaction, Object id) {
+    this.server = server;
+    this.transaction = transaction;
+  }
+
+  void setId(Object id) {
+    this.id = id;
+  }
+
+  @Override
+  public EbeanServer getEbeanServer() {
+    return server;
+  }
+
+  @Override
+  public Transaction getTransaction() {
+    return transaction;
+  }
+
+  @Override
+  public Object getId() {
+    return id;
+  }
+}