Add Spiller and SpillerFactory interface

presto-main/src/main/java/com/facebook/presto/spiller/Spiller.java

@@ -0,0 +1,42 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.facebook.presto.spiller;
+
+import com.facebook.presto.spi.Page;
+
+import java.io.Closeable;
+import java.util.Iterator;
+import java.util.List;
+import java.util.concurrent.CompletableFuture;
+
+public interface Spiller
+        extends Closeable
+{
+    /**
+     * Initiate spilling of pages stream. Returns completed future once spilling has finished.
+     */
+    CompletableFuture<?> spill(Iterator<Page> pageIterator);
+
+    /**
+     * Returns list of previously spilled Pages streams.
+     */
+    List<Iterator<Page>> getSpills();
+
+    /**
+     * Close releases/removes all underlying resources used during spilling
+     * like for example all created temporary files.
+     */
+    @Override
+    void close();
+}

presto-main/src/main/java/com/facebook/presto/spiller/SpillerFactory.java

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+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.facebook.presto.spiller;
+
+import com.facebook.presto.spi.type.Type;
+
+import java.util.List;
+
+public interface SpillerFactory
+{
+    Spiller create(List<Type> types);
+}