1 files changed, 36 insertions, 0 deletions
diff --git a/container-core/src/main/java/com/yahoo/restapi/RestApiRequestHandler.java b/container-core/src/main/java/com/yahoo/restapi/RestApiRequestHandler.java
new file mode 100644
index 00000000000..9fe813903dd
--- /dev/null
+++ b/container-core/src/main/java/com/yahoo/restapi/RestApiRequestHandler.java
@@ -0,0 +1,36 @@
+// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.restapi;
+
+import com.yahoo.container.jdisc.HttpRequest;
+import com.yahoo.container.jdisc.HttpResponse;
+import com.yahoo.container.jdisc.LoggingRequestHandler;
+
+/**
+ * @author bjorncs
+ */
+public abstract class RestApiRequestHandler<T extends RestApiRequestHandler<T>> extends LoggingRequestHandler {
+
+    private final RestApi restApi;
+
+    @FunctionalInterface public interface RestApiProvider<T> { RestApi createRestApi(T self); }
+
+    /**
+     * RestApi will usually refer to handler methods of subclass, which are not accessible before super constructor has completed.
+     * This is hack to leak reference to subclass instance's "this" reference.
+     * Caller must ensure that provider instance does not try to access any uninitialized fields.
+     */
+    @SuppressWarnings("unchecked")
+    protected RestApiRequestHandler(LoggingRequestHandler.Context context, RestApiProvider<T> provider) {
+        super(context);
+        this.restApi = provider.createRestApi((T)this);
+    }
+
+    protected RestApiRequestHandler(LoggingRequestHandler.Context context, RestApi restApi) {
+        super(context);
+        this.restApi = restApi;
+    }
+
+    @Override public final HttpResponse handle(HttpRequest request) { return restApi.handleRequest(request); }
+
+    protected RestApi restApi() { return restApi; }
+}