Add Aggregate event handle

data-prepper-api/src/main/java/org/opensearch/dataprepper/model/acknowledgements/AcknowledgementSetManager.java

@@ -5,9 +5,6 @@
 
 package org.opensearch.dataprepper.model.acknowledgements;
 
-import org.opensearch.dataprepper.model.event.Event;
-import org.opensearch.dataprepper.model.event.EventHandle;
-
 import java.time.Duration;
 import java.util.function.Consumer;
 
@@ -29,32 +26,4 @@ public interface AcknowledgementSetManager {
      * @since 2.2
      */
     AcknowledgementSet create(final Consumer<Boolean> callback, final Duration timeout);
-
-    /**
-     * Releases an event's reference
-     *
-     * @param eventHandle event handle
-     * @param success indicates negative or positive acknowledgement
-     *
-     * @since 2.2
-     */
-    void releaseEventReference(final EventHandle eventHandle, boolean success);
-
-    /**
-     * Acquires an event's reference
-     *
-     * @param eventHandle event handle
-     *
-     * @since 2.2
-     */
-    void acquireEventReference(final EventHandle eventHandle);
-
-    /**
-     * Acquires an event's reference
-     *
-     * @param event event
-     *
-     * @since 2.2
-     */
-    void acquireEventReference(final Event event);
 }

data-prepper-api/src/main/java/org/opensearch/dataprepper/model/event/AbstractEventHandle.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package org.opensearch.dataprepper.model.event;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.time.Instant;
+import java.util.function.BiConsumer;
+
+abstract class AbstractEventHandle implements EventHandle, InternalEventHandle {
+    private Instant externalOriginationTime;
+    private final Instant internalOriginationTime;
+    private List<BiConsumer<EventHandle, Boolean>> releaseConsumers;
+
+    AbstractEventHandle(final Instant internalOriginationTime) {
+        this.externalOriginationTime = null;
+        this.internalOriginationTime = internalOriginationTime;
+        this.releaseConsumers = new ArrayList<>();
+    }
+    @Override
+    public void setExternalOriginationTime(final Instant externalOriginationTime) {
+        this.externalOriginationTime = externalOriginationTime;
+    }
+
+    @Override
+    public Instant getInternalOriginationTime() {
+        return this.internalOriginationTime;
+    }
+
+    @Override
+    public Instant getExternalOriginationTime() {
+        return this.externalOriginationTime;
+    }
+
+    @Override
+    public void onRelease(BiConsumer<EventHandle, Boolean> releaseConsumer) {
+        synchronized (releaseConsumers) {
+            releaseConsumers.add(releaseConsumer);
+        }
+    }
+
+    public void notifyReleaseConsumers(boolean result) {
+        synchronized (releaseConsumers) {
+            for (final BiConsumer<EventHandle, Boolean> consumer: releaseConsumers) {
+                consumer.accept(this, result);
+            }
+        }
+    }
+}

data-prepper-api/src/main/java/org/opensearch/dataprepper/model/event/AggregateEventHandle.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package org.opensearch.dataprepper.model.event;
+
+import org.opensearch.dataprepper.model.acknowledgements.AcknowledgementSet;
+import java.lang.ref.WeakReference;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.time.Instant;
+import java.io.Serializable;
+
+public class AggregateEventHandle extends AbstractEventHandle implements Serializable {
+    private List<WeakReference<AcknowledgementSet>> acknowledgementSetRefList;
+    private Set<Integer> acknowledgementSetHashes;
+
+    public AggregateEventHandle(final Instant internalOriginationTime) {
+        super(internalOriginationTime);
+        this.acknowledgementSetRefList = new ArrayList<>();
+        this.acknowledgementSetHashes = new HashSet<>();
+    }
+
+    @Override
+    public void addAcknowledgementSet(final AcknowledgementSet acknowledgementSet) {
+        int hashCode = acknowledgementSet.hashCode();
+        if (!acknowledgementSetHashes.contains(hashCode)) {
+            this.acknowledgementSetRefList.add(new WeakReference<>(acknowledgementSet));
+            acknowledgementSetHashes.add(hashCode);
+        }
+    }
+
+    @Override
+    public boolean hasAcknowledgementSet() {
+        return acknowledgementSetRefList.size() != 0;
+    }
+
+    @Override
+    public void acquireReference() {
+        synchronized (this) {
+            for (WeakReference<AcknowledgementSet> acknowledgementSetRef: acknowledgementSetRefList) {;
+                AcknowledgementSet acknowledgementSet = acknowledgementSetRef.get();
+                if (acknowledgementSet != null) {
+                    acknowledgementSet.acquire(this);
+                } 
+            }
+        }
+    }
+
+    @Override
+    public boolean release(boolean result) {
+        notifyReleaseConsumers(result);
+        boolean returnValue = true;
+        synchronized (this) {
+            for (WeakReference<AcknowledgementSet> acknowledgementSetRef: acknowledgementSetRefList) {
+                AcknowledgementSet acknowledgementSet = acknowledgementSetRef.get();
+                if (acknowledgementSet != null) {
+                    acknowledgementSet.release(this, result);
+                } else {
+                    returnValue = false;
+                }
+            }
+        }
+        return returnValue;
+    }
+
+    // For testing
+    List<WeakReference<AcknowledgementSet>> getAcknowledgementSetRefs() {
+        return acknowledgementSetRefList;
+    }
+
+}
+

data-prepper-api/src/main/java/org/opensearch/dataprepper/model/event/DefaultEventHandle.java

@@ -14,29 +14,19 @@
 import java.time.Instant;
 import java.io.Serializable;
 
-public class DefaultEventHandle implements EventHandle, InternalEventHandle, Serializable {
-    private Instant externalOriginationTime;
-    private final Instant internalOriginationTime;
+public class DefaultEventHandle extends AbstractEventHandle implements Serializable {
     private WeakReference<AcknowledgementSet> acknowledgementSetRef;
-    private List<BiConsumer<EventHandle, Boolean>> releaseConsumers;
 
     public DefaultEventHandle(final Instant internalOriginationTime) {
+        super(internalOriginationTime);
         this.acknowledgementSetRef = null;
-        this.externalOriginationTime = null;
-        this.internalOriginationTime = internalOriginationTime;
-        this.releaseConsumers = new ArrayList<>();
     }
 
     @Override
-    public void setAcknowledgementSet(final AcknowledgementSet acknowledgementSet) {
+    public void addAcknowledgementSet(final AcknowledgementSet acknowledgementSet) {
         this.acknowledgementSetRef = new WeakReference<>(acknowledgementSet);
     }
 
-    @Override
-    public void setExternalOriginationTime(final Instant externalOriginationTime) {
-        this.externalOriginationTime = externalOriginationTime;
-    }
-
     public AcknowledgementSet getAcknowledgementSet() {
         if (acknowledgementSetRef == null) {
             return null;
@@ -45,32 +35,30 @@ public AcknowledgementSet getAcknowledgementSet() {
     }
 
     @Override
-    public Instant getInternalOriginationTime() {
-        return this.internalOriginationTime;
+    public boolean hasAcknowledgementSet() {
+        AcknowledgementSet acknowledgementSet = getAcknowledgementSet();
+        return acknowledgementSet != null;
     }
 
     @Override
-    public Instant getExternalOriginationTime() {
-        return this.externalOriginationTime;
+    public void acquireReference() {
+        synchronized (this) {
+            AcknowledgementSet acknowledgementSet = getAcknowledgementSet();
+            if (acknowledgementSet != null) {
+                acknowledgementSet.acquire(this);
+            }
+        }
     }
 
     @Override
-    public void release(boolean result) {
-        synchronized (releaseConsumers) {
-            for (final BiConsumer<EventHandle, Boolean> consumer: releaseConsumers) {
-                consumer.accept(this, result);
-            }
-        }
+    public boolean release(boolean result) {
+        notifyReleaseConsumers(result);
         AcknowledgementSet acknowledgementSet = getAcknowledgementSet();
         if (acknowledgementSet != null) {
             acknowledgementSet.release(this, result);
+            return true;
         }
+        return false;
     }
 
-    @Override
-    public void onRelease(BiConsumer<EventHandle, Boolean> releaseConsumer) {
-        synchronized (releaseConsumers) {
-            releaseConsumers.add(releaseConsumer);
-        }
-    }
 }

data-prepper-api/src/main/java/org/opensearch/dataprepper/model/event/EventHandle.java

@@ -14,9 +14,10 @@ public interface EventHandle {
      *
      * @param result result to be used while releasing. This indicates if
      *               the operation on the event handle is success or not
+     * @return returns true if the event handle is released successful, false otherwise
      * @since 2.2
      */
-    void release(boolean result);
+    boolean release(boolean result);
 
     /**
      * sets external origination time

data-prepper-api/src/main/java/org/opensearch/dataprepper/model/event/InternalEventHandle.java

@@ -9,20 +9,27 @@
 
 public interface InternalEventHandle {
     /**
-     * sets acknowledgement set
+     * adds acknowledgement set
      *
      * @param acknowledgementSet acknowledgementSet to be set in the event handle
-     * @since 2.6
+     * @since 2.9
      */
-    void setAcknowledgementSet(final AcknowledgementSet acknowledgementSet);
+    void addAcknowledgementSet(final AcknowledgementSet acknowledgementSet);
 
     /**
-     * gets acknowledgement set
+     * Indicates if the event handle has atleast one acknowledgement set
      *
-     * @return returns acknowledgementSet from the event handle
-     * @since 2.6
+     * @return returns true if there is at least one acknowledgementSet in the event handle
+     * @since 2.9
      */
-    AcknowledgementSet getAcknowledgementSet();
+    boolean hasAcknowledgementSet();
+
+    /**
+     * Acquires reference to acknowledgement set(s) in the event handle
+     *
+     * @since 2.9
+     */
+    void acquireReference();
 
 }