Redefine task and its context

After discussions with bratseth, we'll not organize tasks in a tree structure,
and instead have tasks mostly 1:1 with components. Tasks are put in chains, and
may have ordering constraints between them that the chain resolves.

The FileSystem API has been removed and instead use the raw java NIO
FileSystem, and use Jimfs to mock FileSystem in tests.

NodeAdminStateUpdater has been made an interface, since the HTTP request
handler needs to delegate to it when getting requests. Much of the public HTTP
API will get internalized with standalone NodeAdmin.

1 files changed, 8 insertions, 0 deletions

diff --git a/jdisc_core/src/main/java/com/yahoo/jdisc/Timer.java b/jdisc_core/src/main/java/com/yahoo/jdisc/Timer.java
index c94ebc1ab93..f0dc26844e7 100644
--- a/jdisc_core/src/main/java/com/yahoo/jdisc/Timer.java
+++ b/jdisc_core/src/main/java/com/yahoo/jdisc/Timer.java
@@ -4,6 +4,8 @@ package com.yahoo.jdisc;
 import com.google.inject.ImplementedBy;
 import com.yahoo.jdisc.core.SystemTimer;
 
+import java.time.Instant;
+
 /**
  * <p>This class provides access to the current time in milliseconds, as viewed by the {@link Container}. Inject an
  * instance of this class into any component that needs to access time, instead of using
@@ -27,4 +29,10 @@ public interface Timer {
      */
     long currentTimeMillis();
 
+    /**
+     * Convenience method for getting an java.util.Instance from currentTimeMillis().
+     */
+    default Instant currentTime() {
+        return Instant.ofEpochMilli(currentTimeMillis());
+    }
 }