idempotent change propagation

using lastModified instead of a non-idempotent needsUpdate flag
this fixes a bug where dependees would not be rebuilt if cbt exited
or was killed after dependencies were already rebuilt.

1 files changed, 14 insertions, 2 deletions

diff --git a/compatibility/Dependency.java b/compatibility/Dependency.java
index efb9214..1f719c2 100644
--- a/compatibility/Dependency.java
+++ b/compatibility/Dependency.java
@@ -2,10 +2,22 @@ package cbt;
 import java.io.*;
 
 public interface Dependency{
+  // recently added methods that needs default values for old versions to work
+  public default String moduleKey(){
+    throw new IncompatibleCbtVersionException("You need to define method moduleKey.");
+  };
+  public default long lastModified(){
+    throw new IncompatibleCbtVersionException("You need to define method lastModified.");
+  };
+
+  // methods that exist for longer which every CBT version in use should have by now, no default values needed
   public abstract String show();
-  public abstract String moduleKey();
-  public abstract Boolean needsUpdateCompat();
   public abstract Dependency[] dependenciesArray();
   public abstract File[] dependencyClasspathArray();
   public abstract File[] exportedClasspathArray();
+
+  // deprecated methods
+  @java.lang.Deprecated
+  public abstract boolean needsUpdateCompat();
 }
+