Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/879#discussion_r33864220
--- Diff:
flink-staging/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/runtime/streamrecord/StreamRecord.java
---
@@ -17,87 +17,104 @@
package org.apache.flink.streaming.runtime.streamrecord;
-import java.io.Serializable;
-
-import org.apache.flink.api.java.functions.KeySelector;
-import org.apache.flink.api.java.tuple.Tuple;
+import org.joda.time.Instant;
/**
- * Object for wrapping a tuple or other object with ID used for sending
records
- * between streaming task in Apache Flink stream processing.
+ * One value in a data stream. This stores the value and the associated
timestamp.
*/
-public class StreamRecord<T> implements Serializable {
- private static final long serialVersionUID = 1L;
+public class StreamRecord<T> {
- private T streamObject;
- public boolean isTuple;
+ // We store it as Object so that we can reuse a StreamElement for
emitting
+ // elements of a different type while still reusing the timestamp.
+ private Object value;
+ private Instant timestamp;
/**
- * Creates an empty StreamRecord
+ * Creates a new {@link StreamRecord} wrapping the given value. The
timestamp is set to the
+ * result of {@code new Instant(0)}.
*/
- public StreamRecord() {
+ public StreamRecord(T value) {
+ this(value, new Instant(0));
}
/**
- * Gets the wrapped object from the StreamRecord
- *
- * @return The object wrapped
+ * Creates a new {@link StreamRecord} wrapping the given value. The
timestamp is set to the
+ * given timestamp.
*/
- public T getObject() {
- return streamObject;
+ public StreamRecord(T value, Instant timestamp) {
+ this.value = value;
+ this.timestamp = timestamp;
}
+
/**
- * Gets the field of the contained object at the given position. If a
tuple
- * is wrapped then the getField method is invoked. If the StreamRecord
- * contains and object of Basic types only position 0 could be returned.
- *
- * @param pos
- * Position of the field to get.
- * @return Returns the object contained in the position.
+ * Returns the value wrapped in this stream value.
*/
- public Object getField(int pos) {
- if (isTuple) {
- return ((Tuple) streamObject).getField(pos);
- } else {
- if (pos == 0) {
- return streamObject;
- } else {
- throw new IndexOutOfBoundsException();
- }
- }
+ @SuppressWarnings("unchecked")
+ public T getValue() {
+ return (T) value;
--- End diff --
But then it just requires casts in another place...
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