Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/848#discussion_r32708806
--- Diff:
flink-staging/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/functions/source/FromElementsFunction.java
---
@@ -17,37 +17,71 @@
package org.apache.flink.streaming.api.functions.source;
-import java.util.Arrays;
-import java.util.Collection;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.core.memory.DataInputView;
+import org.apache.flink.core.memory.InputViewDataInputStreamWrapper;
+import org.apache.flink.core.memory.OutputViewDataOutputStreamWrapper;
+
+import java.io.*;
import java.util.Iterator;
public class FromElementsFunction<T> implements SourceFunction<T> {
private static final long serialVersionUID = 1L;
- private Iterable<T> iterable;
+ private final TypeSerializer<T> serializer;
+ private final byte[] elements;
private volatile boolean isRunning = true;
- public FromElementsFunction(T... elements) {
- this.iterable = Arrays.asList(elements);
- }
+ public FromElementsFunction(TypeSerializer<T> serializer, final T...
elements) {
+ this(serializer, new Iterable<T>() {
+ @Override
+ public Iterator<T> iterator() {
+ return new Iterator<T>() {
+ int index = 0;
+
+ @Override
+ public boolean hasNext() {
+ return index < elements.length;
+ }
- public FromElementsFunction(Collection<T> elements) {
- this.iterable = elements;
+ @Override
+ public T next() {
+ return elements[index++];
+ }
+ };
+ }
+ });
}
- public FromElementsFunction(Iterable<T> elements) {
- this.iterable = elements;
+ public FromElementsFunction(TypeSerializer<T> serializer, Iterable<T>
elements) {
+ ByteArrayOutputStream baos = new ByteArrayOutputStream();
+ OutputViewDataOutputStreamWrapper wrapper = new
OutputViewDataOutputStreamWrapper(new DataOutputStream(baos));
+
+ try {
+ for (T element : elements)
+ serializer.serialize(element, wrapper);
+ } catch (IOException e) {
+ // ByteArrayOutputStream doesn't throw IOExceptions
when written to
+ }
+ // closing the DataOutputStream would just flush the
ByteArrayOutputStream, which in turn doesn't do anything.
+
+ this.serializer = serializer;
+ this.elements = baos.toByteArray();
}
@Override
public void run(SourceContext<T> ctx) throws Exception {
- Iterator<T> it = iterable.iterator();
+ T value = serializer.createInstance();
+ ByteArrayInputStream bais = new ByteArrayInputStream(elements);
+ DataInputView input = new InputViewDataInputStreamWrapper(new
DataInputStream(bais));
- while (isRunning && it.hasNext()) {
- ctx.collect(it.next());
+ while (isRunning && bais.available() > 0) {
+ value = serializer.deserialize(value, input);
+ ctx.collect(value);
}
+ // closing the DataOutputStream would just close the
ByteArrayInputStream, which doesn't do anything
--- End diff --
I guess you meant the `DataInputStream`.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
