Added error ignoring

core/src/main/java/dev/faststats/core/ErrorTracker.java

@@ -1,10 +1,12 @@
 package dev.faststats.core;
 
+import org.intellij.lang.annotations.RegExp;
 import org.jetbrains.annotations.Contract;
 import org.jspecify.annotations.Nullable;
 
 import java.util.Optional;
 import java.util.function.BiConsumer;
+import java.util.regex.Pattern;
 
 /**
  * An error tracker.
@@ -96,6 +98,85 @@ static ErrorTracker contextUnaware() {
     @Contract(mutates = "this")
     void trackError(Throwable error, boolean handled);
 
+    /**
+     * Adds an error type that will not be reported to FastStats.
+     * <p>
+     * Matching is done exactly. If, for example {@link LinkageError} was ignored,
+     * {@link NoClassDefFoundError} would still be reported, even though it extends {@link LinkageError}
+     *
+     * @param type the error type
+     * @return the error tracker
+     * @since 0.21.0
+     */
+    @Contract(value = "_ -> this", mutates = "this")
+    ErrorTracker ignoreErrorType(Class<? extends Throwable> type);
+
+    /**
+     * Adds a pattern that will be matched against all error messages.
+     * <p>
+     * If an error's message matches the given pattern, it will not be reported to FastStats.
+     * <pre>{@code
+     * // Exact match
+     * tracker.ignoreError(Pattern.compile("No space left on device"));
+     *
+     * // Regex match
+     * tracker.ignoreError(Pattern.compile("No serializer for: class .*"));
+     * }</pre>
+     *
+     * @param pattern the regex pattern to match against error messages
+     * @return the error tracker
+     * @since 0.21.0
+     */
+    @Contract(value = "_ -> this", mutates = "this")
+    ErrorTracker ignoreError(Pattern pattern);
+
+    /**
+     * Adds a pattern that will be matched against all error messages.
+     * <p>
+     * If an error's message matches the given pattern, it will not be reported to FastStats.
+     *
+     * @param pattern the regex pattern string to match against error messages
+     * @return the error tracker
+     * @see #ignoreError(Pattern)
+     * @since 0.21.0
+     */
+    @Contract(value = "_ -> this", mutates = "this")
+    default ErrorTracker ignoreError(@RegExp final String pattern) {
+        return ignoreError(Pattern.compile(pattern));
+    }
+
+    /**
+     * Adds an error type combined with a message pattern that will not be reported to FastStats.
+     * <p>
+     * An error is ignored only if its class matches the given type exactly and its message matches the given pattern.
+     * <pre>{@code
+     * tracker.ignoreError(IOException.class, Pattern.compile("No space left on device"));
+     * }</pre>
+     *
+     * @param type    the error type
+     * @param pattern the regex pattern to match against error messages
+     * @return the error tracker
+     * @since 0.21.0
+     */
+    @Contract(value = "_, _ -> this", mutates = "this")
+    ErrorTracker ignoreError(Class<? extends Throwable> type, Pattern pattern);
+
+    /**
+     * Adds an error type combined with a message pattern that will not be reported to FastStats.
+     * <p>
+     * An error is ignored only if its class matches the given type exactly and its message matches the given pattern.
+     *
+     * @param type    the error type
+     * @param pattern the regex pattern string to match against error messages
+     * @return the error tracker
+     * @see #ignoreError(Class, Pattern)
+     * @since 0.21.0
+     */
+    @Contract(value = "_, _ -> this", mutates = "this")
+    default ErrorTracker ignoreError(final Class<? extends Throwable> type, @RegExp final String pattern) {
+        return ignoreError(type, Pattern.compile(pattern));
+    }
+
     /**
      * Attaches an error context to the tracker.
      * <p>

core/src/main/java/dev/faststats/core/SimpleErrorTracker.java

@@ -5,15 +5,25 @@
 import org.jspecify.annotations.Nullable;
 
 import java.lang.Thread.UncaughtExceptionHandler;
+import java.util.Collections;
+import java.util.IdentityHashMap;
 import java.util.Map;
 import java.util.Optional;
+import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.CopyOnWriteArraySet;
 import java.util.function.BiConsumer;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 final class SimpleErrorTracker implements ErrorTracker {
     private final Map<String, Integer> collected = new ConcurrentHashMap<>();
     private final Map<String, JsonObject> reports = new ConcurrentHashMap<>();
 
+    private final Map<Class<? extends Throwable>, Set<Pattern>> ignoredTypedPatterns = new ConcurrentHashMap<>();
+    private final Set<Class<? extends Throwable>> ignoredTypes = new CopyOnWriteArraySet<>();
+    private final Set<Pattern> ignoredPatterns = new CopyOnWriteArraySet<>();
+
     private volatile @Nullable BiConsumer<@Nullable ClassLoader, Throwable> errorEvent = null;
     private volatile @Nullable UncaughtExceptionHandler originalHandler = null;
 
@@ -35,6 +45,7 @@ public void trackError(final String message, final boolean handled) {
     @Override
     public void trackError(final Throwable error, final boolean handled) {
         try {
+            if (isIgnored(error, Collections.newSetFromMap(new IdentityHashMap<>()))) return;
             final var compiled = ErrorHelper.compile(error, null, handled);
             final var hashed = MurmurHash3.hash(compiled);
             if (collected.compute(hashed, (k, v) -> {
@@ -45,6 +56,39 @@ public void trackError(final Throwable error, final boolean handled) {
         }
     }
 
+    private boolean isIgnored(@Nullable final Throwable error, final Set<Throwable> visited) {
+        if (error == null || !visited.add(error)) return false;
+
+        if (ignoredTypes.contains(error.getClass())) return true;
+
+        final var message = error.getMessage() != null ? error.getMessage() : "";
+        if (ignoredPatterns.stream().map(pattern -> pattern.matcher(message)).anyMatch(Matcher::find)) return true;
+
+        final var patterns = ignoredTypedPatterns.get(error.getClass());
+        if (patterns != null && patterns.stream().map(pattern -> pattern.matcher(message)).anyMatch(Matcher::find))
+            return true;
+
+        return isIgnored(error.getCause(), visited);
+    }
+
+    @Override
+    public ErrorTracker ignoreErrorType(final Class<? extends Throwable> type) {
+        ignoredTypes.add(type);
+        return this;
+    }
+
+    @Override
+    public ErrorTracker ignoreError(final Pattern pattern) {
+        ignoredPatterns.add(pattern);
+        return this;
+    }
+
+    @Override
+    public ErrorTracker ignoreError(final Class<? extends Throwable> type, final Pattern pattern) {
+        ignoredTypedPatterns.computeIfAbsent(type, k -> new CopyOnWriteArraySet<>()).add(pattern);
+        return this;
+    }
+
     public JsonArray getData(final String buildId) {
         final var report = new JsonArray(reports.size());
 

gradle.properties

@@ -1 +1 @@
-version=0.20.1
+version=0.21.0