1 files changed, 35 insertions, 0 deletions
diff --git a/logserver/src/main/java/com/yahoo/plugin/SystemPropertyConfig.java b/logserver/src/main/java/com/yahoo/plugin/SystemPropertyConfig.java
new file mode 100644
index 00000000000..763dc2d1f3e
--- /dev/null
+++ b/logserver/src/main/java/com/yahoo/plugin/SystemPropertyConfig.java
@@ -0,0 +1,35 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.plugin;
+
+/**
+ * This class implements plugin config through system properties.
+ * Each plugin typically has its own system property prefix, such as
+ * "logserver.archiver.".  A request for the config key "foo" will
+ * then return the contents of the "logserver.archiver.foo" system
+ * property.
+ *
+ * @author  <a href="mailto:stig@yahoo-inc.com">Stig Bakken</a>
+ */
+public class SystemPropertyConfig extends Config
+{
+    private final String prefix;
+
+    /**
+     * @param prefix Prefix string prepended to config keys
+     * as they are looked up as system properties.
+     */
+    public SystemPropertyConfig(String prefix) {
+        this.prefix = prefix;
+    }
+
+    /**
+     * @return a config value for the specified key
+     */
+    public String get(String key, String defaultValue) {
+        return System.getProperty(prefix + key, defaultValue);
+    }
+
+    public String toString () {
+        return "Prefix=" + prefix;
+    }
+}