[new] Add SLF4Jv2 backend/provider

Adapted from Telemere

project.clj

@@ -66,9 +66,10 @@
     :dependencies
     [[org.clojure/test.check    "1.1.1"]
      [org.clojure/tools.logging "1.3.0"]
+     [org.slf4j/slf4j-api       "2.0.16"]
+     [com.taoensso/timbre-slf4j "6.6.0-SNAPSHOT"]
      [com.taoensso/nippy        "3.4.2"]
-     [com.taoensso/carmine      "3.4.1"
-      :exclusions [com.taoensso/timbre]]
+     [com.taoensso/carmine      "3.4.1" :exclusions [com.taoensso/timbre]]
      [com.draines/postal        "2.0.5"]]
 
     :plugins

slf4j/.gitignore

@@ -0,0 +1,15 @@
+pom.xml*
+.lein*
+.nrepl-port
+*.jar
+*.class
+.env
+.DS_Store
+/lib/
+/classes/
+/target/
+/checkouts/
+/logs/
+/.clj-kondo/.cache
+.idea/
+*.iml

slf4j/project.clj

@@ -0,0 +1,29 @@
+(defproject com.taoensso/timbre-slf4j "6.6.0-SNAPSHOT"
+  :author "Peter Taoussanis <https://www.taoensso.com>"
+  :description "Timbre backend/provider for SLF4J API v2"
+  :url "https://www.taoensso.com/timbre"
+
+  :license
+  {:name "Eclipse Public License - v 1.0"
+   :url  "https://www.eclipse.org/legal/epl-v10.html"}
+
+  :scm {:name "git" :url "https://github.com/taoensso/timbre"}
+
+  :java-source-paths ["src/java"]
+  :javac-options     ["--release" "8" "-g"] ; Support Java >= v8
+  :dependencies      []
+
+  :profiles
+  {:provided
+   {:dependencies
+    [[org.clojure/clojure "1.11.4"]
+     [org.slf4j/slf4j-api "2.0.16"]
+     [com.taoensso/timbre "6.6.0-SNAPSHOT"]]}
+
+   :dev
+   {:plugins
+    [[lein-pprint  "1.3.2"]
+     [lein-ancient "0.7.0"]]}}
+
+  :aliases
+  {"deploy-lib" ["do" #_["build-once"] ["deploy" "clojars"] ["install"]]})

slf4j/resources/META-INF/services/org.slf4j.spi.SLF4JServiceProvider

@@ -0,0 +1 @@
+com.taoensso.timbre.slf4j.TimbreServiceProvider

slf4j/src/java/com/taoensso/timbre/slf4j/TimbreLogger.java

@@ -0,0 +1,78 @@
+/**
+ * Copyright (c) 2004-2011 QOS.ch
+ * All rights reserved.
+ *
+ * Permission is hereby granted, free  of charge, to any person obtaining
+ * a  copy  of this  software  and  associated  documentation files  (the
+ * "Software"), to  deal in  the Software without  restriction, including
+ * without limitation  the rights to  use, copy, modify,  merge, publish,
+ * distribute,  sublicense, and/or sell  copies of  the Software,  and to
+ * permit persons to whom the Software  is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The  above  copyright  notice  and  this permission  notice  shall  be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
+ * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
+ * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+package com.taoensso.timbre.slf4j;
+// Based on `org.slf4j.simple.SimpleLogger`
+
+import java.io.Serializable;
+
+import org.slf4j.Logger;
+import org.slf4j.Marker;
+import org.slf4j.event.Level;
+import org.slf4j.event.LoggingEvent;
+import org.slf4j.helpers.LegacyAbstractLogger;
+import org.slf4j.spi.LoggingEventAware;
+
+import clojure.java.api.Clojure;
+import clojure.lang.IFn;
+
+public class TimbreLogger extends LegacyAbstractLogger implements LoggingEventAware, Serializable {
+
+    private static final long serialVersionUID = -1999356203037132557L;
+
+    private static boolean INITIALIZED = false;
+    static void lazyInit() {
+        if (INITIALIZED) { return; }
+        INITIALIZED = true;
+        init();
+    }
+
+    private static IFn logFn;
+    private static IFn isAllowedFn;
+
+    static void init() {
+        IFn requireFn =   Clojure.var("clojure.core", "require");
+        requireFn.invoke(Clojure.read("taoensso.timbre.slf4j"));
+        isAllowedFn =     Clojure.var("taoensso.timbre.slf4j", "allowed?");
+        logFn =           Clojure.var("taoensso.timbre.slf4j", "log!");
+    }
+
+    protected TimbreLogger(String name) { this.name = name; }
+
+    protected boolean isLevelEnabled(Level level) { return (boolean) isAllowedFn.invoke(this.name, level);       }
+    public    boolean isTraceEnabled()            { return (boolean) isAllowedFn.invoke(this.name, Level.TRACE); }
+    public    boolean isDebugEnabled()            { return (boolean) isAllowedFn.invoke(this.name, Level.DEBUG); }
+    public    boolean  isInfoEnabled()            { return (boolean) isAllowedFn.invoke(this.name, Level.INFO);  }
+    public    boolean  isWarnEnabled()            { return (boolean) isAllowedFn.invoke(this.name, Level.WARN);  }
+    public    boolean isErrorEnabled()            { return (boolean) isAllowedFn.invoke(this.name, Level.ERROR); }
+
+    public void log(LoggingEvent event) { logFn.invoke(this.name, event); } // Fluent (modern) API, called after level check
+
+    @Override protected String getFullyQualifiedCallerName() { return null; }
+    @Override
+    protected void handleNormalizedLoggingCall(Level level, Marker marker, String messagePattern, Object[] arguments, Throwable throwable) {
+        logFn.invoke(this.name, level, throwable, messagePattern, arguments, marker); // Legacy API, called after level check
+    }
+
+}

slf4j/src/java/com/taoensso/timbre/slf4j/TimbreLoggerFactory.java

@@ -0,0 +1,54 @@
+/**
+ * Copyright (c) 2004-2011 QOS.ch
+ * All rights reserved.
+ *
+ * Permission is hereby granted, free  of charge, to any person obtaining
+ * a  copy  of this  software  and  associated  documentation files  (the
+ * "Software"), to  deal in  the Software without  restriction, including
+ * without limitation  the rights to  use, copy, modify,  merge, publish,
+ * distribute,  sublicense, and/or sell  copies of  the Software,  and to
+ * permit persons to whom the Software  is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The  above  copyright  notice  and  this permission  notice  shall  be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
+ * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
+ * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+package com.taoensso.timbre.slf4j;
+// Based on `org.slf4j.simple.SimpleLoggerFactory`
+
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+
+import org.slf4j.Logger;
+import org.slf4j.ILoggerFactory;
+
+public class TimbreLoggerFactory implements ILoggerFactory {
+
+    ConcurrentMap<String, Logger> loggerMap;
+
+    public TimbreLoggerFactory() {
+        loggerMap = new ConcurrentHashMap<>();
+        TimbreLogger.lazyInit();
+    }
+
+    public Logger getLogger(String name) {
+        return loggerMap.computeIfAbsent(name, this::createLogger);
+    }
+
+    protected Logger createLogger(String name) {
+        return new TimbreLogger(name);
+    }
+
+    protected void reset() {
+        loggerMap.clear();
+    }
+}

slf4j/src/java/com/taoensso/timbre/slf4j/TimbreServiceProvider.java

@@ -0,0 +1,54 @@
+/**
+ * Copyright (c) 2004-2011 QOS.ch
+ * All rights reserved.
+ *
+ * Permission is hereby granted, free  of charge, to any person obtaining
+ * a  copy  of this  software  and  associated  documentation files  (the
+ * "Software"), to  deal in  the Software without  restriction, including
+ * without limitation  the rights to  use, copy, modify,  merge, publish,
+ * distribute,  sublicense, and/or sell  copies of  the Software,  and to
+ * permit persons to whom the Software  is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The  above  copyright  notice  and  this permission  notice  shall  be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
+ * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
+ * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+package com.taoensso.timbre.slf4j;
+// Based on `org.slf4j.simple.SimpleServiceProvider`
+
+import org.slf4j.ILoggerFactory;
+import org.slf4j.IMarkerFactory;
+import org.slf4j.helpers.BasicMarkerFactory;
+import org.slf4j.helpers.BasicMDCAdapter;
+import org.slf4j.spi.MDCAdapter;
+import org.slf4j.spi.SLF4JServiceProvider;
+
+public class TimbreServiceProvider implements SLF4JServiceProvider {
+
+    public static String REQUESTED_API_VERSION = "2.0.99"; // Should not be final
+
+    private ILoggerFactory loggerFactory;
+    private IMarkerFactory markerFactory;
+    private MDCAdapter     mdcAdapter;
+
+              public ILoggerFactory getLoggerFactory()       { return loggerFactory; }
+    @Override public IMarkerFactory getMarkerFactory()       { return markerFactory; }
+    @Override public MDCAdapter     getMDCAdapter()          { return mdcAdapter; }
+    @Override public String         getRequestedApiVersion() { return REQUESTED_API_VERSION; }
+    @Override
+    public void initialize() {
+        loggerFactory = new TimbreLoggerFactory();
+        markerFactory = new BasicMarkerFactory();
+        mdcAdapter    = new BasicMDCAdapter();
+    }
+
+}