Target poll DB performance improvements (#613)

* Async update on last target query.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

* 10 seconds

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

* Completed batch and optimzed schema.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

* Cleanup and test.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

* readibility.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

* Batch update.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

* Sonar issue fixed.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

hawkbit-repository/hawkbit-repository-api/src/main/java/org/eclipse/hawkbit/repository/RepositoryProperties.java

@@ -8,6 +8,8 @@
  */
 package org.eclipse.hawkbit.repository;
 
+import java.util.concurrent.TimeUnit;
+
 import org.eclipse.hawkbit.repository.event.remote.TargetPollEvent;
 import org.eclipse.hawkbit.repository.model.ActionStatus;
 import org.springframework.boot.context.properties.ConfigurationProperties;
@@ -34,6 +36,45 @@ public class RepositoryProperties {
      */
     private boolean publishTargetPollEvent = true;
 
+    /**
+     * Maximum number of poll operations queued before flush.
+     */
+    private int pollPersistenceQueueSize = 10_000;
+
+    /**
+     * Maximum time before queue is flushed in {@link TimeUnit#MILLISECONDS}.
+     */
+    private long pollPersistenceFlushTime = TimeUnit.SECONDS.toMillis(10);
+
+    /**
+     * Set to true to persist polls immediately.
+     */
+    private boolean eagerPollPersistence;
+
+    public boolean isEagerPollPersistence() {
+        return eagerPollPersistence;
+    }
+
+    public void setEagerPollPersistence(final boolean eagerPollPersistence) {
+        this.eagerPollPersistence = eagerPollPersistence;
+    }
+
+    public long getPollPersistenceFlushTime() {
+        return pollPersistenceFlushTime;
+    }
+
+    public void setPollPersistenceFlushTime(final long pollPersistenceFlushTime) {
+        this.pollPersistenceFlushTime = pollPersistenceFlushTime;
+    }
+
+    public int getPollPersistenceQueueSize() {
+        return pollPersistenceQueueSize;
+    }
+
+    public void setPollPersistenceQueueSize(final int pollPersistenceQueueSize) {
+        this.pollPersistenceQueueSize = pollPersistenceQueueSize;
+    }
+
     public boolean isRejectActionStatusForClosedAction() {
         return rejectActionStatusForClosedAction;
     }

hawkbit-repository/hawkbit-repository-api/src/main/java/org/eclipse/hawkbit/repository/event/remote/TargetPollEvent.java

@@ -26,6 +26,11 @@ public class TargetPollEvent extends RemoteTenantAwareEvent {
         // for serialization libs like jackson
     }
 
+    public TargetPollEvent(final String controllerId, final String tenant, final String applicationId) {
+        super(controllerId, tenant, applicationId);
+        this.controllerId = controllerId;
+    }
+
     public TargetPollEvent(final Target target, final String applicationId) {
         super(target.getControllerId(), target.getTenant(), applicationId);
         this.controllerId = target.getControllerId();

hawkbit-repository/hawkbit-repository-api/src/main/java/org/eclipse/hawkbit/repository/model/ActionStatus.java

@@ -25,7 +25,7 @@ public interface ActionStatus extends TenantAwareBaseEntity {
      * @return time in {@link TimeUnit#MILLISECONDS} when the status was
      *         reported.
      */
-    Long getOccurredAt();
+    long getOccurredAt();
 
     /**
      * @return {@link Action} this {@link ActionStatus} belongs to.