support referencing other log items that are detached (fire & forget)

for async tasks that are not awaited

src/logging/BaseLogger.js

@@ -24,13 +24,39 @@ export class BaseLogger {
     }
 
     log(labelOrValues, logLevel = LogLevel.Info) {
-        const item = new LogItem(labelOrValues, logLevel, null, this._platform.clock);
+        const item = new LogItem(labelOrValues, logLevel, null, this);
         item._end = item._start;
         this._persistItem(item.serialize(null));
     }
 
-    run(labelOrValues, callback, logLevel = LogLevel.Info, filterCreator = null) {
+    wrapOrRun(item, labelOrValues, callback, logLevel = null, filterCreator = null) {
-        const item = new LogItem(labelOrValues, logLevel, null, this._platform.clock);
+        if (item) {
+            return item.wrap(labelOrValues, callback, logLevel, filterCreator);
+        } else {
+            return this.run(labelOrValues, callback, logLevel, filterCreator);
+        }
+    }
+
+    runDetached(labelOrValues, callback, logLevel = null, filterCreator = null) {
+        if (logLevel === null) {
+            logLevel = LogLevel.Info;
+        }
+        const item = new LogItem(labelOrValues, logLevel, null, this);
+        const refId = Math.round(this._platform.random() * Number.MAX_SAFE_INTEGER);
+        item.set("refId", refId);
+        this._run(item, callback, logLevel, filterCreator, false /* don't throw, nobody is awaiting */);
+        return item;
+    }
+
+    run(labelOrValues, callback, logLevel = null, filterCreator = null) {
+        if (logLevel === null) {
+            logLevel = LogLevel.Info;
+        }
+        const item = new LogItem(labelOrValues, logLevel, null, this);
+        return this._run(item, callback, logLevel, filterCreator, true);
+    }
+
+    _run(item, callback, logLevel, filterCreator, shouldThrow) {
         this._openItems.add(item);
 
         const finishItem = () => {
@@ -64,7 +90,9 @@ export class BaseLogger {
                     return promiseResult;
                 }, err => {
                     finishItem();
-                    throw err;
+                    if (shouldThrow) {
+                        throw err;
+                    }
                 });
             } else {
                 finishItem();
@@ -72,7 +100,9 @@ export class BaseLogger {
             }
         } catch (err) {
             finishItem();
-            throw err;
+            if (shouldThrow) {
+                throw err;
+            }
         }
     }
 
@@ -106,4 +136,8 @@ export class BaseLogger {
     get level() {
         return LogLevel;
     }
+
+    _now() {
+        return this._platform.clock.now();
+    }
 }

src/logging/LogItem.js

@@ -17,9 +17,9 @@ limitations under the License.
 import {LogLevel, LogFilter} from "./LogFilter.js";
 
 export class LogItem {
-    constructor(labelOrValues, logLevel, filterCreator, clock) {
+    constructor(labelOrValues, logLevel, filterCreator, logger) {
-        this._clock = clock;
+        this._logger = logger;
-        this._start = clock.now();
+        this._start = logger._now();
         this._end = null;
         // (l)abel
         this._values = typeof labelOrValues === "string" ? {l: labelOrValues} : labelOrValues;
@@ -29,6 +29,14 @@ export class LogItem {
         this._filterCreator = filterCreator;
     }
 
+    runDetached(labelOrValues, callback, logLevel, filterCreator) {
+        return this._logger.runDetached(labelOrValues, callback, logLevel, filterCreator);
+    }
+
+    wrapDetached(labelOrValues, callback, logLevel, filterCreator) {
+        this.refDetached(this.runDetached(labelOrValues, callback, logLevel, filterCreator));
+    }
+
     /**
      * Creates a new child item and runs it in `callback`.
      */
@@ -70,6 +78,9 @@ export class LogItem {
     log(labelOrValues, logLevel = null) {
         const item = this.child(labelOrValues, logLevel, null);
         item.end = item.start;
+
+    refDetached(logItem, logLevel = null) {
+        return this.log({ref: logItem._values.refId}, logLevel);
     }
 
     set(key, value) {
@@ -177,7 +188,7 @@ export class LogItem {
                     c.finish();
                 }
             }
-            this._end = this._clock.now();
+            this._end = this._logger._now();
         }
     }
 
@@ -200,7 +211,7 @@ export class LogItem {
         if (!logLevel) {
             logLevel = this.logLevel || LogLevel.Info;
         }
-        const item = new LogItem(labelOrValues, logLevel, filterCreator, this._clock);
+        const item = new LogItem(labelOrValues, logLevel, filterCreator, this._logger);
         if (this._children === null) {
             this._children = [];
         }