DBZ-1726 Introduce DataCollectionId#identifier()

debezium-connector-mongodb/src/main/java/io/debezium/connector/mongodb/CollectionId.java

@@ -79,6 +79,11 @@ public String replicaSetName() {
         return replicaSetName;
     }
 
+    @Override
+    public String identifier() {
+        return replicaSetName + "." + dbName + "." + name;
+    }
+
     @Override
     public int hashCode() {
         return name.hashCode();
@@ -109,6 +114,6 @@ public String namespace() {
 
     @Override
     public String toString() {
-        return replicaSetName + "." + dbName + "." + name;
+        return identifier();
     }
 }

debezium-connector-mongodb/src/main/java/io/debezium/connector/mongodb/MongoDbSnapshotChangeEventSource.java

@@ -526,7 +526,7 @@ else if (snapshotContext.lastCollection) {
 
                 LOGGER.info("\t Finished exporting {} records for collection '{}'; total duration '{}'", docs, collectionId,
                         Strings.duration(clock.currentTimeInMillis() - exportStart));
-                snapshotProgressListener.dataCollectionSnapshotCompleted(collectionId.toString(), docs);
+                snapshotProgressListener.dataCollectionSnapshotCompleted(collectionId, docs);
             }
         });
     }

debezium-core/src/main/java/io/debezium/pipeline/metrics/SnapshotChangeEventSourceMetrics.java

@@ -20,6 +20,7 @@
 import io.debezium.pipeline.source.spi.EventMetadataProvider;
 import io.debezium.pipeline.source.spi.SnapshotProgressListener;
 import io.debezium.relational.TableId;
+import io.debezium.schema.DataCollectionId;
 
 /**
  * Metrics related to the initial snapshot of a connector.
@@ -89,20 +90,20 @@ public String[] getMonitoredTables() {
     }
 
     @Override
-    public void monitoredTablesDetermined(Iterable<TableId> tableIds) {
-        Iterator<TableId> it = tableIds.iterator();
+    public void monitoredCollectionsDetermined(Iterable<DataCollectionId> dataCollectionIds) {
+        Iterator<DataCollectionId> it = dataCollectionIds.iterator();
         while (it.hasNext()) {
-            TableId tableId = it.next();
+            DataCollectionId dataCollectionId = it.next();
 
-            this.remainingTables.put(tableId.toString(), "");
-            monitoredTables.add(tableId.toString());
+            this.remainingTables.put(dataCollectionId.identifier(), "");
+            monitoredTables.add(dataCollectionId.identifier());
         }
     }
 
     @Override
-    public void dataCollectionSnapshotCompleted(String dataCollectionId, long numRows) {
-        rowsScanned.put(dataCollectionId, numRows);
-        remainingTables.remove(dataCollectionId);
+    public void dataCollectionSnapshotCompleted(DataCollectionId dataCollectionId, long numRows) {
+        rowsScanned.put(dataCollectionId.identifier(), numRows);
+        remainingTables.remove(dataCollectionId.identifier());
     }
 
     @Override

debezium-core/src/main/java/io/debezium/pipeline/source/spi/SnapshotProgressListener.java

@@ -5,7 +5,11 @@
  */
 package io.debezium.pipeline.source.spi;
 
+import static io.debezium.util.Iterators.toIterable;
+import static io.debezium.util.Iterators.transform;
+
 import io.debezium.relational.TableId;
+import io.debezium.schema.DataCollectionId;
 
 /**
  * A class invoked by {@link SnapshotChangeEventSource} whenever an important event or change of state happens.
@@ -16,21 +20,29 @@ public interface SnapshotProgressListener {
 
     void snapshotStarted();
 
-    void monitoredTablesDetermined(Iterable<TableId> tableIds);
+    /**
+     * @deprecated Since 1.1, use {@link #monitoredCollectionsDetermined(Iterable)} instead.
+     */
+    @Deprecated
+    default void monitoredTablesDetermined(Iterable<TableId> tableIds) {
+        monitoredCollectionsDetermined(toIterable(transform(tableIds.iterator(), tableId -> tableId)));
+    }
+
+    void monitoredCollectionsDetermined(Iterable<DataCollectionId> dataCollectionIds);
 
     void snapshotCompleted();
 
     void snapshotAborted();
 
     /**
-     * @deprecated Since 1.1, use {@link #dataCollectionSnapshotCompleted(String, long)} instead.
+     * @deprecated Since 1.1, use {@link #dataCollectionSnapshotCompleted(DataCollectionId, long)} instead.
      */
     @Deprecated
     default void tableSnapshotCompleted(TableId id, long numRows) {
-        dataCollectionSnapshotCompleted(id.toString(), numRows);
+        dataCollectionSnapshotCompleted(id, numRows);
     }
 
-    void dataCollectionSnapshotCompleted(String dataCollectionId, long numRows);
+    void dataCollectionSnapshotCompleted(DataCollectionId dataCollectionId, long numRows);
 
     void rowsScanned(TableId tableId, long numRows);
 
@@ -45,11 +57,11 @@ public void rowsScanned(TableId tableId, long numRows) {
         }
 
         @Override
-        public void monitoredTablesDetermined(Iterable<TableId> tableIds) {
+        public void monitoredCollectionsDetermined(Iterable<DataCollectionId> dataCollectionIds) {
         }
 
         @Override
-        public void dataCollectionSnapshotCompleted(String dataCollectionId, long numRows) {
+        public void dataCollectionSnapshotCompleted(DataCollectionId dataCollectionId, long numRows) {
         }
 
         @Override

debezium-core/src/main/java/io/debezium/relational/TableId.java

@@ -117,6 +117,11 @@ public String table() {
         return tableName;
     }
 
+    @Override
+    public String identifier() {
+        return id;
+    }
+
     @Override
     public int compareTo(TableId that) {
         if (this == that) {
@@ -147,7 +152,7 @@ public boolean equals(Object obj) {
 
     @Override
     public String toString() {
-        return id;
+        return identifier();
     }
 
     /**

debezium-core/src/main/java/io/debezium/schema/DataCollectionId.java

@@ -11,4 +11,11 @@
  * @author Gunnar Morling
  */
 public interface DataCollectionId {
+
+    /**
+     * Get the fully qualified identifier of the data collection.
+     *
+     * @return the collection's fully qualified identifier.
+     */
+    String identifier();
 }

debezium-core/src/main/java/io/debezium/util/Iterators.java

@@ -330,6 +330,68 @@ public void remove() {
         };
     }
 
+    /**
+     * Get an {@link Iterable} from an {@link Iterator}.
+     *
+     * @param iterator the source iterator
+     * @param <T> the iterator type
+     *
+     * @return the iterable
+     */
+    public static <T> Iterable<T> toIterable(Iterator<T> iterator) {
+        return new Iterable<T>() {
+            @Override
+            public Iterator<T> iterator() {
+                return iterator;
+            }
+        };
+    }
+
+    /**
+     * An iterator that is able to transform its contents to another type.
+     *
+     * @param <F> the source transform type
+     * @param <T> the destination transform type
+     */
+    public static interface TransformedIterator<F, T> extends Iterator<T> {
+        T transform(F from);
+    }
+
+    /**
+     * Transform an iterator from a given type to super types.
+     *
+     * @param fromIterator the source iterator
+     * @param function the function to be applied when performing element transformation
+     *
+     * @param <F> the source transform type
+     * @param <T> the destination transform type
+     *
+     * @return the transformed iterator
+     */
+    public static <F, T> Iterator<T> transform(Iterator<F> fromIterator, Function<? super F, ? extends T> function) {
+        return new TransformedIterator<F, T>() {
+            @Override
+            public boolean hasNext() {
+                return fromIterator.hasNext();
+            }
+
+            @Override
+            public T next() {
+                return transform(fromIterator.next());
+            }
+
+            @Override
+            public void remove() {
+                fromIterator.remove();
+            }
+
+            @Override
+            public T transform(F from) {
+                return function.apply(from);
+            }
+        };
+    }
+
     /**
      * A read only iterator that is able to preview the next value without consuming it or altering the behavior or semantics
      * of the normal {@link Iterator} methods.