1 files changed, 48 insertions, 0 deletions
diff --git a/src/main/java/bjc/esodata/Spool.java b/src/main/java/bjc/esodata/Spool.java
new file mode 100644
index 0000000..f065093
--- /dev/null
+++ b/src/main/java/bjc/esodata/Spool.java
@@ -0,0 +1,48 @@
+package bjc.esodata;
+
+import java.util.Iterator;
+import java.util.function.Consumer;
+
+/**
+ * A single spool, or batch of input.
+ * 
+ * @author bjcul
+ * 
+ * @param <T> The type contained by the spool
+ */
+public interface Spool<T> {
+	/**
+	 * Get the label that identifies this spool, if it has one.
+	 * 
+	 * @return The label of the spool, or null if it is unlabeled.
+	 */
+	public String label();
+
+	/**
+	 * Get the group that this spool belongs to, if it belongs to one.
+	 * 
+	 * @return The group the spool is in, or null if it is not in a group.
+	 */
+	public String group();
+
+	/**
+	 * Get a function that will add input to this spool
+	 * 
+	 * @return A function that will add input to this spool.
+	 */
+	public Consumer<T> getInput();
+
+	/**
+	 * Get an iterator that will iterate over the data contained in this spool.
+	 * 
+	 * @return An iterator over the data in this spool.
+	 */
+	public Iterator<T> getOutput();
+
+	/**
+	 * Is this spool closed, meaning it can accept no more input?
+	 * 
+	 * @return Whether the spool is closed
+	 */
+	public boolean isClosed();
+}
+\ No newline at end of file