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-rw-r--r--same/src/main/java/com/orbekk/same/State.java28
1 files changed, 27 insertions, 1 deletions
diff --git a/same/src/main/java/com/orbekk/same/State.java b/same/src/main/java/com/orbekk/same/State.java
index 303caca..49ee8c4 100644
--- a/same/src/main/java/com/orbekk/same/State.java
+++ b/same/src/main/java/com/orbekk/same/State.java
@@ -5,6 +5,8 @@ import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.HashMap;
+import java.util.Set;
+import java.util.TreeSet;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.JsonParseException;
@@ -14,11 +16,26 @@ import org.codehaus.jackson.type.TypeReference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
+/**
+ * This class is not thread-safe. In particular, modifications to this class
+ * while getUpdatedComponents() is being used is unsafe. When accessing
+ * updatedComponents, synchronize on State:
+ *
+ * <code>
+ * synchronize (state) {
+ * for (String component : state.updatedComponents()) {
+ * // Do work.
+ * }
+ * state.clearUpdatedComponents();
+ * }
+ * </code>
+ */
public class State {
private Logger logger = LoggerFactory.getLogger(getClass());
private Map<String, Component> state = new HashMap<String, Component>();
private ObjectMapper mapper = new ObjectMapper();
-
+ private Set<String> updatedComponents = new TreeSet<String>();
+
public State(String networkName) {
update(".networkName", networkName, 0);
updateFromObject(".participants", new ArrayList<String>(), 0);
@@ -36,6 +53,7 @@ public class State {
component.setRevision(revision + 1);
component.setData(data);
state.put(componentName, component);
+ updatedComponents.add(componentName);
return true;
} else {
return false;
@@ -110,6 +128,14 @@ public class State {
}
}
+ public Set<String> getUpdatedComponents() {
+ return updatedComponents;
+ }
+
+ public void clearUpdatedComponents() {
+ this.updatedComponents.clear();
+ }
+
public static class Component {
private long revision;
private String data;