DATACOUCH-59 - Allow expiry touch on read

Configuration is based on Document annotation. When read of document takes place then touch action is executed on document. It is an asynchronous action so it does not block read. It is executed only on single reads (not view-based or N1QL-based ones).

src/integration/java/org/springframework/data/couchbase/core/CouchbaseTemplateTests.java

@@ -402,6 +402,22 @@ public class CouchbaseTemplateTests {
 		assertEquals(versionedClass.getVersion(), foundClass.getVersion());
 	}
 
+	/**
+	 * @see DATACOUCH-59
+   */
+	@Test
+	public void expiryWhenTouchOnReadDocument() throws InterruptedException {
+		String id = "simple-doc-with-update-expiry-for-read";
+		DocumentWithTouchOnRead doc = new DocumentWithTouchOnRead(id);
+		template.save(doc);
+		Thread.sleep(1500);
+		assertNotNull(template.findById(id, DocumentWithTouchOnRead.class));
+		Thread.sleep(1500);
+		assertNotNull(template.findById(id, DocumentWithTouchOnRead.class));
+		Thread.sleep(3000);
+		assertNull(template.findById(id, DocumentWithTouchOnRead.class));
+	}
+
 	/**
 	 * A sample document with just an id and property.
 	 */
@@ -433,6 +449,20 @@ public class CouchbaseTemplateTests {
 		}
 	}
 
+	/**
+	 * A sample document that expires in 2 seconds and touchOnRead set.
+	 */
+	@Document(expiry = 2, touchOnRead = true)
+	static class DocumentWithTouchOnRead {
+
+		@Id
+		private final String id;
+
+		public DocumentWithTouchOnRead(String id) {
+			this.id = id;
+		}
+	}
+
 	@Document
 	static class ComplexPerson {