Add support for querying ProgressReporter's JSON metric values.

Author: pdekanov

substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/ProgressReporter.java

@@ -867,6 +867,20 @@ private void checkForExcessiveGarbageCollection() {
         lastGCStats = currentGCStats;
     }
 
+    public Object getJsonMetricValue(JsonMetric metric) {
+        if (jsonHelper == null) {
+            return null;
+        }
+        return metric.getValue(jsonHelper);
+    }
+
+    public boolean containsJsonMetricValue(JsonMetric metric) {
+        if (jsonHelper == null) {
+            return false;
+        }
+        return metric.containsValue(jsonHelper);
+    }
+
     public void recordJsonMetric(JsonMetric metric, Object value) {
         if (jsonHelper != null) {
             metric.record(jsonHelper, value);

substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/ProgressReporterJsonHelper.java

@@ -54,6 +54,82 @@ private static List<String> buildKeys(String... keys) {
         return Arrays.stream(keys).filter(Objects::nonNull).toList();
     }
 
+    /**
+     * Returns the {@link Map} stored in the given object under the given key or null if the map
+     * does not exist.
+     */
+    @SuppressWarnings("unchecked")
+    private static Map<String, Object> getMap(Map<String, Object> object, String key) {
+        Objects.requireNonNull(key, "JSON keys must not be 'null'");
+        return (Map<String, Object>) object.get(key);
+    }
+
+    /**
+     * Gets value from {@link #statsHolder} for the given key sequence.
+     * <p>
+     * For example for {@code keys = [a, b, c, d]} it will return the value of
+     * {@code statsHolder[a][b][c][d]}.
+     */
+    private Object getValue(List<String> keys) {
+        assert !keys.isEmpty();
+        Map<String, Object> currentLevel = statsHolder;
+
+        /*
+         * Iteratively index into the next level until the second-last key. Return null if there is
+         * no defined value on some level while traversing.
+         */
+        for (int i = 0; i < keys.size() - 1; i++) {
+            currentLevel = getMap(currentLevel, keys.get(i));
+            if (currentLevel == null) {
+                return null;
+            }
+        }
+
+        return currentLevel.get(keys.getLast());
+    }
+
+    public Object getAnalysisResults(AnalysisResults key) {
+        return getValue(buildKeys(ANALYSIS_RESULTS_KEY, key.bucket, key.key));
+    }
+
+    public Object getGeneralInfo(GeneralInfo info) {
+        return getValue(buildKeys(GENERAL_INFO_KEY, info.bucket, info.key));
+    }
+
+    public Object getImageDetails(ImageDetailKey key) {
+        return getValue(buildKeys(IMAGE_DETAILS_KEY, key.bucket, key.subBucket, key.jsonKey));
+    }
+
+    public Object getResourceUsage(ResourceUsageKey key) {
+        return getValue(buildKeys(RESOURCE_USAGE_KEY, key.bucket, key.jsonKey));
+    }
+
+    /**
+     * Checks if there is a set value from {@link #statsHolder} for the given key sequence.
+     * <p>
+     * For example for {@code keys = [a, b, c, d]} it will return true if
+     * {@code statsHolder[a][b][c][d]} exists.
+     */
+    private boolean containsValue(List<String> keys) {
+        return getValue(keys) != null;
+    }
+
+    public boolean containsAnalysisResults(AnalysisResults key) {
+        return containsValue(buildKeys(ANALYSIS_RESULTS_KEY, key.bucket, key.key));
+    }
+
+    public boolean containsGeneralInfo(GeneralInfo info) {
+        return containsValue(buildKeys(GENERAL_INFO_KEY, info.bucket, info.key));
+    }
+
+    public boolean containsImageDetails(ImageDetailKey key) {
+        return containsValue(buildKeys(IMAGE_DETAILS_KEY, key.bucket, key.subBucket, key.jsonKey));
+    }
+
+    public boolean containsResourceUsage(ResourceUsageKey key) {
+        return containsValue(buildKeys(RESOURCE_USAGE_KEY, key.bucket, key.jsonKey));
+    }
+
     /**
      * Returns the {@link Map} stored in the given object under the given key.
      * <p>
@@ -108,11 +184,15 @@ public void print(JsonWriter writer) throws IOException {
         writer.print(statsHolder);
     }
 
-    interface JsonMetric {
+    public interface JsonMetric {
+        Object getValue(ProgressReporterJsonHelper helper);
+
+        boolean containsValue(ProgressReporterJsonHelper helper);
+
         void record(ProgressReporterJsonHelper helper, Object value);
     }
 
-    enum ImageDetailKey implements JsonMetric {
+    public enum ImageDetailKey implements JsonMetric {
         TOTAL_SIZE(null, null, "total_bytes"),
         CODE_AREA_SIZE("code_area", null, "bytes"),
         NUM_COMP_UNITS("code_area", null, "compilation_units"),
@@ -134,13 +214,23 @@ enum ImageDetailKey implements JsonMetric {
             this.subBucket = subBucket;
         }
 
+        @Override
+        public Object getValue(ProgressReporterJsonHelper helper) {
+            return helper.getImageDetails(this);
+        }
+
+        @Override
+        public boolean containsValue(ProgressReporterJsonHelper helper) {
+            return helper.containsImageDetails(this);
+        }
+
         @Override
         public void record(ProgressReporterJsonHelper helper, Object value) {
             helper.putImageDetails(this, value);
         }
     }
 
-    enum ResourceUsageKey implements JsonMetric {
+    public enum ResourceUsageKey implements JsonMetric {
         CPU_LOAD("cpu", "load"),
         CPU_CORES_TOTAL("cpu", "total_cores"),
         GC_COUNT("garbage_collection", "count"),
@@ -159,6 +249,16 @@ enum ResourceUsageKey implements JsonMetric {
             this.jsonKey = key;
         }
 
+        @Override
+        public Object getValue(ProgressReporterJsonHelper helper) {
+            return helper.getResourceUsage(this);
+        }
+
+        @Override
+        public boolean containsValue(ProgressReporterJsonHelper helper) {
+            return helper.containsResourceUsage(this);
+        }
+
         @Override
         public void record(ProgressReporterJsonHelper helper, Object value) {
             helper.putResourceUsage(this, value);
@@ -199,6 +299,16 @@ public String bucket() {
             return bucket;
         }
 
+        @Override
+        public Object getValue(ProgressReporterJsonHelper helper) {
+            return helper.getAnalysisResults(this);
+        }
+
+        @Override
+        public boolean containsValue(ProgressReporterJsonHelper helper) {
+            return helper.containsAnalysisResults(this);
+        }
+
         @Override
         public void record(ProgressReporterJsonHelper helper, Object value) {
             if (value instanceof Integer v) {
@@ -234,6 +344,16 @@ public String jsonKey() {
             return key;
         }
 
+        @Override
+        public Object getValue(ProgressReporterJsonHelper helper) {
+            return helper.getGeneralInfo(this);
+        }
+
+        @Override
+        public boolean containsValue(ProgressReporterJsonHelper helper) {
+            return helper.containsGeneralInfo(this);
+        }
+
         @Override
         public void record(ProgressReporterJsonHelper helper, Object value) {
             if (value instanceof String || value instanceof Boolean || value instanceof List || value == null) {