Merge branch 'master' of https://github.com/gnembon/fabric-carpet

src/main/java/carpet/script/value/ThreadValue.java

@@ -0,0 +1,78 @@
+package carpet.script.value;
+
+import carpet.script.Context;
+import carpet.script.LazyValue;
+import carpet.script.exception.InternalExpressionException;
+
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+public class ThreadValue extends Value
+{
+    CompletableFuture<Value> taskFuture;
+    private long id;
+    private static long sequence = 0L;
+
+    private static final ExecutorService executorService = Executors.newCachedThreadPool();
+
+    public ThreadValue(LazyValue expression, Context ctx)
+    {
+        id = sequence++;
+        taskFuture = CompletableFuture.supplyAsync(
+                () -> expression.evalValue(ctx),
+                executorService
+        );
+    }
+
+    @Override
+    public String getString()
+    {
+        return taskFuture.getNow(Value.NULL).getString();
+    }
+
+    @Override
+    public boolean getBoolean()
+    {
+        return taskFuture.getNow(Value.NULL).getBoolean();
+    }
+
+    public Value join()
+    {
+        try
+        {
+            return taskFuture.get();
+        }
+        catch (InterruptedException | ExecutionException e)
+        {
+            return Value.NULL;
+        }
+    }
+
+    public boolean isFinished()
+    {
+        return taskFuture.isDone();
+    }
+
+    public void stop()
+    {
+        taskFuture.complete(Value.NULL);
+    }
+
+    @Override
+    public boolean equals(Object o)
+    {
+        if (!(o instanceof ThreadValue))
+            return false;
+        return ((ThreadValue) o).id == this.id;
+    }
+
+    @Override
+    public int compareTo(Value o)
+    {
+        if (!(o instanceof ThreadValue))
+            throw new InternalExpressionException("Cannot compare ");
+        return (int) (this.id - ((ThreadValue) o).id);
+    }
+}