1 files changed, 30 insertions, 0 deletions
diff --git a/config-provisioning/src/main/java/com/yahoo/config/provision/SharedHosts.java b/config-provisioning/src/main/java/com/yahoo/config/provision/SharedHosts.java
new file mode 100644
index 00000000000..44a91d2861d
--- /dev/null
+++ b/config-provisioning/src/main/java/com/yahoo/config/provision/SharedHosts.java
@@ -0,0 +1,30 @@
+package com.yahoo.config.provision;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
+/**
+ * @author hakonhall
+ */
+public interface SharedHosts {
+    static SharedHosts empty() {
+        return new SharedHosts() {
+            @Override public boolean supportsClusterType(ClusterSpec.Type clusterType) { return false; }
+            @Override public boolean hasClusterType(ClusterSpec.Type clusterType) { return false; }
+        };
+    }
+
+    static SharedHosts ofConstant(boolean supportsClusterType, boolean hasClusterType) {
+        return new SharedHosts() {
+            @Override public boolean supportsClusterType(ClusterSpec.Type clusterType) { return supportsClusterType; }
+            @Override public boolean hasClusterType(ClusterSpec.Type clusterType) { return hasClusterType; }
+        };
+    }
+
+    /** Whether there are any shared hosts specifically for the given cluster type, or without a cluster type restriction. */
+    @JsonIgnore
+    boolean supportsClusterType(ClusterSpec.Type clusterType);
+
+    /** Whether there are any shared hosts specifically for the given cluster type. */
+    @JsonIgnore
+    boolean hasClusterType(ClusterSpec.Type clusterType);
+}