1 files changed, 21 insertions, 0 deletions
diff --git a/node-admin/src/main/java/com/yahoo/vespa/hosted/node/admin/component/AdminComponent.java b/node-admin/src/main/java/com/yahoo/vespa/hosted/node/admin/component/AdminComponent.java
new file mode 100644
index 00000000000..9bed492bd76
--- /dev/null
+++ b/node-admin/src/main/java/com/yahoo/vespa/hosted/node/admin/component/AdminComponent.java
@@ -0,0 +1,21 @@
+// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.vespa.hosted.node.admin.component;
+
+/**
+ * An AdminComponent cannot assume anything about the environment until enable()
+ * is called: Required YUM packages may not have been installed, services
+ * not started, etc. An enabled AdminComponent can be disabled to disengage from
+ * the environment.
+ */
+public interface AdminComponent {
+    /**
+     * Enable component. May be called more than once.
+     */
+    void enable();
+
+    /**
+     * Disable component. May be called more than once.
+     * Must be compatible with component deconstruct().
+     */
+    void disable();
+}