fixes #13 - new CommandJdo_retry mixin

dom/src/main/java/org/isisaddons/module/command/dom/CommandJdo.java

@@ -489,6 +489,16 @@ public static class MementoDomainEvent extends PropertyDomainEvent<String> { }
 
     //endregion
 
+    //region > isLegacyMemento (programmatic)
+    @Programmatic
+    public boolean isLegacyMemento() {
+        return getMemento() != null && getMemento().startsWith("<memento");
+    }
+    //endregion
+
+
+
+
     //region > startedAt (property)
 
     public static class StartedAtDomainEvent extends PropertyDomainEvent<Timestamp> { }

dom/src/main/java/org/isisaddons/module/command/dom/CommandJdo_retry.java

@@ -0,0 +1,77 @@
+/*
+ *  Copyright 2016 Dan Haywood
+ *
+ *  Licensed under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.isisaddons.module.command.dom;
+
+import org.apache.isis.applib.annotation.*;
+import org.apache.isis.applib.services.command.CommandContext;
+import org.apache.isis.applib.services.jaxb.JaxbService;
+import org.apache.isis.schema.cmd.v1.CommandDto;
+import org.isisaddons.module.command.CommandModule;
+
+import javax.inject.Inject;
+
+@Mixin
+public class CommandJdo_retry<T> {
+
+
+    private final CommandJdo commandJdo;
+
+    //region > constructor
+    public CommandJdo_retry(CommandJdo commandJdo) {
+        this.commandJdo = commandJdo;
+    }
+    //endregion
+
+
+    public static class ActionDomainEvent extends CommandModule.ActionDomainEvent<CommandJdo_retry> { }
+    @Action(
+            semantics = SemanticsOf.NON_IDEMPOTENT_ARE_YOU_SURE,
+            domainEvent = ActionDomainEvent.class
+    )
+    @ActionLayout(
+            contributed = Contributed.AS_ACTION
+    )
+    public CommandJdo $$() {
+
+        final String memento = commandJdo.getMemento();
+        final CommandDto dto = jaxbService.fromXml(CommandDto.class, memento);
+        backgroundCommandServiceJdo.schedule(
+                dto, commandContext.getCommand(), commandJdo.getTargetClass(), commandJdo.getTargetAction(), commandJdo.getArguments());
+
+        return commandJdo;
+    }
+
+    public String disable$$() {
+        if (!commandJdo.isCausedException()) {
+            return "Only failed commands can be retried";
+        }
+        if (commandJdo.isLegacyMemento()) {
+            return "Only non-legacy commands can be retried";
+        }
+
+        return null;
+    }
+
+
+    @Inject
+    CommandContext commandContext;
+    @Inject
+    BackgroundCommandServiceJdo backgroundCommandServiceJdo;
+    @Inject
+    JaxbService jaxbService;
+
+}