#933: Implement Destroyable, Startable and Stoppable on ObjectEnabler

To call `LwM2mInstanceEnabler#stop()`, `LwM2mInstanceEnabler#start()`
and `LwM2mInstanceEnabler#destroy()` on the associated method, for each
enabler if implemented the interface.

Signed-off-by: moznion <moznion@gmail.com>

leshan-client-core/src/main/java/org/eclipse/leshan/client/resource/LwM2mInstanceEnabler.java

@@ -22,6 +22,9 @@
 
 import org.eclipse.leshan.client.LwM2mClient;
 import org.eclipse.leshan.client.servers.ServerIdentity;
+import org.eclipse.leshan.core.Destroyable;
+import org.eclipse.leshan.core.Startable;
+import org.eclipse.leshan.core.Stoppable;
 import org.eclipse.leshan.core.model.ObjectModel;
 import org.eclipse.leshan.core.node.LwM2mObjectInstance;
 import org.eclipse.leshan.core.node.LwM2mResource;
@@ -45,6 +48,12 @@
  * <p>
  * Implementations of this interface should adhere to the definition of the implemented LWM2M Object type regarding
  * acceptable resource IDs for the <code>read, write</code> and <code>execute</code> methods.
+ * <p>
+ * An instance that implements this interface synchronizes with the lifecycle of the LeshanClient. This means when
+ * {@code LeshanClient#destroy()} is called, {@code LwM2mInstanceEnabler#destroy()} is also called if it implements the
+ * {@link Destroyable} interface. And {@link Startable} ({@code #start()}) and {@link Stoppable} ({@code #stop()}) are
+ * also same as this. If you need to restart the instance, please implement {@link Startable} with {@link Stoppable}
+ * together.
  */
 public interface LwM2mInstanceEnabler {
 

leshan-client-core/src/main/java/org/eclipse/leshan/client/resource/ObjectEnabler.java

@@ -28,7 +28,10 @@
 import org.eclipse.leshan.client.LwM2mClient;
 import org.eclipse.leshan.client.servers.ServerIdentity;
 import org.eclipse.leshan.client.servers.ServersInfoExtractor;
+import org.eclipse.leshan.core.Destroyable;
 import org.eclipse.leshan.core.LwM2mId;
+import org.eclipse.leshan.core.Startable;
+import org.eclipse.leshan.core.Stoppable;
 import org.eclipse.leshan.core.model.ObjectModel;
 import org.eclipse.leshan.core.node.LwM2mObject;
 import org.eclipse.leshan.core.node.LwM2mObjectInstance;
@@ -62,7 +65,7 @@
  * Implementing a {@link LwM2mInstanceEnabler} then creating an {@link ObjectEnabler} with {@link ObjectsInitializer} is
  * the easier way to implement LWM2M object in Leshan client.
  */
-public class ObjectEnabler extends BaseObjectEnabler {
+public class ObjectEnabler extends BaseObjectEnabler implements Destroyable, Startable, Stoppable {
 
     protected Map<Integer, LwM2mInstanceEnabler> instances;
     protected LwM2mInstanceEnablerFactory instanceFactory;
@@ -411,4 +414,33 @@ public void setLwM2mClient(LwM2mClient client) {
             instanceEnabler.setLwM2mClient(client);
         }
     }
+
+    @Override
+    public void destroy() {
+        for (LwM2mInstanceEnabler instanceEnabler : instances.values()) {
+            if (instanceEnabler instanceof Destroyable) {
+                ((Destroyable) instanceEnabler).destroy();
+            } else if (instanceEnabler instanceof Stoppable) {
+                ((Stoppable) instanceEnabler).stop();
+            }
+        }
+    }
+
+    @Override
+    public void start() {
+        for (LwM2mInstanceEnabler instanceEnabler : instances.values()) {
+            if (instanceEnabler instanceof Startable) {
+                ((Startable) instanceEnabler).start();
+            }
+        }
+    }
+
+    @Override
+    public void stop() {
+        for (LwM2mInstanceEnabler instanceEnabler : instances.values()) {
+            if (instanceEnabler instanceof Stoppable) {
+                ((Stoppable) instanceEnabler).stop();
+            }
+        }
+    }
 }