From eb7fbbd08bb003a47d9788a9f6476695ab46b271 Mon Sep 17 00:00:00 2001
From: Marcin Chrzanowski <marcin.j.chrzanowski@gmail.com>
Date: Tue, 31 Dec 2019 17:31:38 +0100
Subject: Add message to set a single attribute

---
 .../agent/messages/SetAttributeMessage.java        | 37 ++++++++++++++++++++++
 .../cloudatlas/agent/messages/StanikMessage.java   |  1 +
 .../edu/mimuw/cloudatlas/agent/modules/Stanik.java | 25 +++++++++++++++
 3 files changed, 63 insertions(+)
 create mode 100644 src/main/java/pl/edu/mimuw/cloudatlas/agent/messages/SetAttributeMessage.java

(limited to 'src/main/java/pl/edu/mimuw/cloudatlas')

diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/agent/messages/SetAttributeMessage.java b/src/main/java/pl/edu/mimuw/cloudatlas/agent/messages/SetAttributeMessage.java
new file mode 100644
index 0000000..4888484
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/agent/messages/SetAttributeMessage.java
@@ -0,0 +1,37 @@
+package pl.edu.mimuw.cloudatlas.agent.messages;
+
+import pl.edu.mimuw.cloudatlas.agent.modules.ModuleType;
+import pl.edu.mimuw.cloudatlas.model.Attribute;
+import pl.edu.mimuw.cloudatlas.model.Value;
+import pl.edu.mimuw.cloudatlas.model.ValueTime;
+
+public class SetAttributeMessage extends StanikMessage {
+    private String pathName;
+    private Attribute attribute;
+    private Value value;
+    private ValueTime updateTimestamp;
+
+    public SetAttributeMessage(String messageId, long timestamp, String pathName, Attribute attribute, Value value, ValueTime updateTimestamp) {
+        super(messageId, timestamp, Type.SET_ATTRIBUTE);
+        this.pathName = pathName;
+        this.attribute = attribute;
+        this.value = value;
+        this.updateTimestamp = updateTimestamp;
+    }
+
+    public String getPathName() {
+        return pathName;
+    }
+
+    public Attribute getAttribute() {
+        return attribute;
+    }
+
+    public Value getValue() {
+        return value;
+    }
+
+    public ValueTime getUpdateTimestamp() {
+        return updateTimestamp;
+    }
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/agent/messages/StanikMessage.java b/src/main/java/pl/edu/mimuw/cloudatlas/agent/messages/StanikMessage.java
index d86de4a..844f31c 100644
--- a/src/main/java/pl/edu/mimuw/cloudatlas/agent/messages/StanikMessage.java
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/agent/messages/StanikMessage.java
@@ -7,6 +7,7 @@ public abstract class StanikMessage extends AgentMessage {
     public enum Type {
         GET_STATE,
         REMOVE_ZMI,
+        SET_ATTRIBUTE,
         UPDATE_ATTRIBUTES,
         UPDATE_QUERIES
     }
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/Stanik.java b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/Stanik.java
index b030901..3e5b790 100644
--- a/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/Stanik.java
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/Stanik.java
@@ -6,6 +6,7 @@ import java.util.Map.Entry;
 import pl.edu.mimuw.cloudatlas.agent.messages.AgentMessage;
 import pl.edu.mimuw.cloudatlas.agent.messages.GetStateMessage;
 import pl.edu.mimuw.cloudatlas.agent.messages.RemoveZMIMessage;
+import pl.edu.mimuw.cloudatlas.agent.messages.SetAttributeMessage;
 import pl.edu.mimuw.cloudatlas.agent.messages.StateMessage;
 import pl.edu.mimuw.cloudatlas.agent.messages.StanikMessage;
 import pl.edu.mimuw.cloudatlas.agent.messages.UpdateAttributesMessage;
@@ -49,6 +50,9 @@ public class Stanik extends Module {
             case REMOVE_ZMI:
                 handleRemoveZMI((RemoveZMIMessage) message);
                 break;
+            case SET_ATTRIBUTE:
+                handleSetAttribte((SetAttributeMessage) message);
+                break;
             case UPDATE_ATTRIBUTES:
                 handleUpdateAttributes((UpdateAttributesMessage) message);
                 break;
@@ -85,6 +89,27 @@ public class Stanik extends Module {
         }
     }
 
+    /*
+     * Always adds the new attribute.
+     * The zone must already exist.
+     * The zone's timestamp will be the maximum of its current timestamp or the
+     * timestamp provided with the new value.
+     */
+    public void handleSetAttribte(SetAttributeMessage message) {
+        try {
+            ZMI zmi = hierarchy.findDescendant(new PathName(message.getPathName()));
+            ValueTime updateTimestamp = message.getUpdateTimestamp();
+            ValueTime currentTimestamp = (ValueTime) zmi.getAttributes().getOrNull("timestamp");
+            if (ValueUtils.valueLower(currentTimestamp, updateTimestamp)) {
+                zmi.getAttributes().addOrChange("timestamp", updateTimestamp);
+            }
+
+            zmi.getAttributes().addOrChange(message.getAttribute(), message.getValue());
+        } catch (ZMI.NoSuchZoneException e) {
+            System.out.println("DEBUG: trying to set attribute in zone that doesn't exist");
+        }
+    }
+
     public void handleUpdateAttributes(UpdateAttributesMessage message) {
         try {
             validateUpdateAttributesMessage(message);
-- 
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