Adding new module with supporting graalvm appenders. Signed-off-by: Dmitry Kubakhov <[email protected]>

Signed-off-by: DmitryKubakhov <[email protected]>

Author: DmitryKubakhov

graalvm/build.gradle

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+
+description = POM_DESCRIPTION
+dependencies {
+    compileOnly 'ch.qos.logback:logback-classic:1.2.3'
+    compileOnly 'org.graalvm.sdk:graal-sdk:22.3.0'
+}

graalvm/gradle.properties

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+POM_NAME=logback-ext-graalvm
+POM_ARTIFACT_ID=logback-ext-graalvm
+POM_PACKAGING=jar
+POM_DESCRIPTION="Logback Extensions :: GraalVM"

graalvm/src/main/java/ch/qos/logback/ext/graalvm/appenders/GraalVMLazyAsyncAppender.java

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+package ch.qos.logback.ext.graalvm.appenders;
+
+import org.graalvm.nativeimage.ImageInfo;
+
+import ch.qos.logback.classic.spi.ILoggingEvent;
+
+/**
+ * Async appender for using with GraalVM.
+ */
+public class GraalVMLazyAsyncAppender extends LazyAsyncAppender {
+
+    /**
+     * In the build phase of the image appender should not be started.
+     */
+    @Override
+    public void start() {
+        if (!ImageInfo.inImageBuildtimeCode()) {
+            super.start();
+        }
+    }
+
+    /**
+     * While getting the even in NOT build image phase async appender must be started - otherwise start it.
+     *
+     * @param eventObject event to append.
+     */
+    @Override
+    public void doAppend(ILoggingEvent eventObject) {
+        if (!ImageInfo.inImageBuildtimeCode()) {
+            if (!isStarted()) {
+                synchronized (this) {
+                    if (!isStarted()) {
+                        super.start();
+                    }
+                }
+            }
+            super.doAppend(eventObject);
+        }
+    }
+}

graalvm/src/main/java/ch/qos/logback/ext/graalvm/appenders/GraalVMRollingFileAppender.java

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+package ch.qos.logback.ext.graalvm.appenders;
+
+import org.graalvm.nativeimage.ImageInfo;
+
+import ch.qos.logback.core.rolling.RollingFileAppender;
+
+/**
+ * GraalVM implementation of the {@link RollingFileAppender} with initialization of all files descriptors not in the build image phase.
+ */
+public class GraalVMRollingFileAppender<E> extends RollingFileAppender<E> {
+
+    /**
+     * In the build phase of the image appender should not be started.
+     */
+    @Override
+    public void start() {
+        if (!ImageInfo.inImageBuildtimeCode()) {
+            super.start();
+        }
+    }
+
+    /**
+     * While getting the even in NOT build image phase async appender must be started - otherwise start it.
+     *
+     * @param eventObject event to append.
+     */
+    @Override
+    public void doAppend(E eventObject) {
+        if (!ImageInfo.inImageBuildtimeCode()) {
+            if (!isStarted()) {
+                synchronized (this) {
+                    if (!isStarted()) {
+                        super.start();
+                    }
+                }
+            }
+            super.doAppend(eventObject);
+        }
+    }
+}

graalvm/src/main/java/ch/qos/logback/ext/graalvm/appenders/LazyAsyncAppender.java

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+package ch.qos.logback.ext.graalvm.appenders;
+
+import ch.qos.logback.classic.Level;
+import ch.qos.logback.classic.spi.ILoggingEvent;
+
+/**
+ * Lazy async appender with worker initialization on start phase.
+ */
+public class LazyAsyncAppender extends LazyAsyncAppenderBase<ILoggingEvent> {
+
+    boolean includeCallerData = false;
+
+    /**
+     * Events of level TRACE, DEBUG and INFO are deemed to be discardable.
+     *
+     * @param event
+     * @return true if the event is of level TRACE, DEBUG or INFO false otherwise.
+     */
+    protected boolean isDiscardable(ILoggingEvent event) {
+        Level level = event.getLevel();
+        return level.toInt() <= Level.INFO_INT;
+    }
+
+    protected void preprocess(ILoggingEvent eventObject) {
+        eventObject.prepareForDeferredProcessing();
+        if (includeCallerData)
+            eventObject.getCallerData();
+    }
+
+    public boolean isIncludeCallerData() {
+        return includeCallerData;
+    }
+
+    public void setIncludeCallerData(boolean includeCallerData) {
+        this.includeCallerData = includeCallerData;
+    }
+
+}