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Coverage data was added for multimodules, now it's merged (#15)
* First iteration * Iteration 2 * Iteration 3 * merging correctly now * Fixed merging
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‎jacoco-console-reporter/src/main/java/io/github/svaningelgem/ExecutionDataMerger.java

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package io.github.svaningelgem;
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import org.jacoco.core.data.*;
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import org.jetbrains.annotations.NotNull;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Set;
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/**
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* Handles merging execution data from multiple sources to prevent duplicated coverage counts
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*/
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public class ExecutionDataMerger {
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// Map to track which classes we've processed (by class ID)
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private final Map<Long, String> processedClasses = new HashMap<>();
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// Store to hold merged execution data
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private final ExecutionDataStore mergedStore = new ExecutionDataStore();
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private final SessionInfoStore sessionInfoStore = new SessionInfoStore();
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/**
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* Loads execution data from multiple files with deduplication
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*
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* @param execFiles Set of JaCoCo exec files to process
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* @return Merged execution data store
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* @throws IOException if there are issues reading the exec files
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*/
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public @NotNull ExecutionDataStore loadExecutionData(@NotNull Set<File> execFiles) throws IOException {
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for (File execFile : execFiles) {
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if (execFile == null || !execFile.exists()) {
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continue;
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}
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loadExecFile(execFile);
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}
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return mergedStore;
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}
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/**
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* Loads an individual JaCoCo execution data file
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*/
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private void loadExecFile(@NotNull File execFile) throws IOException {
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try (FileInputStream in = new FileInputStream(execFile)) {
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ExecutionDataReader reader = new ExecutionDataReader(in);
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reader.setExecutionDataVisitor(new MergingVisitor());
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reader.setSessionInfoVisitor(sessionInfoStore);
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reader.read();
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}
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}
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/**
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* Get the number of unique classes processed
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*/
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public int getUniqueClassCount() {
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return processedClasses.size();
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}
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/**
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* Get the merged execution data store (for testing)
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*/
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public ExecutionDataStore getMergedStore() {
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return mergedStore;
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}
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/**
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* Merges execution data for testing purposes
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*/
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public void mergeExecData(ExecutionData data) {
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if (data == null) {
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return;
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}
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// Track that we've seen this class
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processedClasses.put(data.getId(), data.getName());
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// Add to store (JaCoCo will handle the merging)
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mergedStore.put(data);
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}
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/**
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* Custom visitor that intelligently merges execution data
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*/
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private class MergingVisitor implements IExecutionDataVisitor {
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@Override
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public void visitClassExecution(ExecutionData data) {
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final Long classId = data.getId();
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final String className = data.getName();
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// Track this class
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processedClasses.put(classId, className);
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// JaCoCo's ExecutionDataStore will automatically merge probe arrays
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// when you put() execution data with the same class ID
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mergedStore.put(data);
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}
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}
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}

‎jacoco-console-reporter/src/main/java/io/github/svaningelgem/JacocoConsoleReporterMojo.java

Lines changed: 20 additions & 14 deletions
Original file line numberDiff line numberDiff line change
@@ -259,39 +259,45 @@ private void scanDirectoryForExecFiles(@NotNull File dir, List<String> execPatte
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}
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/**
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* Loads JaCoCo execution data from the specified files.
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* Creates both execution data and session info stores to capture
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* all coverage information from the JaCoCo output files.
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* Loads JaCoCo execution data from the specified files with proper deduplication.
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* Uses the ExecutionDataMerger to ensure line and branch coverage isn't duplicated
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* when aggregating coverage from multiple modules that share common code.
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*
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* @return Populated execution data store with coverage information
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* @return Populated execution data store with deduplicated coverage information
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* @throws IOException if there are issues reading the JaCoCo execution files
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*/
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private @NotNull ExecutionDataStore loadExecutionData() throws IOException {
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ExecutionDataStore executionDataStore = new ExecutionDataStore();
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SessionInfoStore sessionInfoStore = new SessionInfoStore();
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getLog().debug("Loading execution data with line-level deduplication");
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ExecutionDataMerger merger = new ExecutionDataMerger();
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// Load all exec files
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for (File execFile : collectedExecFilePaths) {
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if (execFile == null || !execFile.exists()) {
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continue;
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}
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// Pass all exec files to the merger
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ExecutionDataStore executionDataStore = merger.loadExecutionData(collectedExecFilePaths);
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loadExecFile(execFile, executionDataStore, sessionInfoStore);
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getLog().debug("Processed exec file: " + execFile);
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}
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int fileCount = (int) collectedExecFilePaths.stream()
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.filter(file -> file != null && file.exists())
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.count();
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getLog().debug(String.format("Processed %d exec files containing data for %d unique classes",
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fileCount, merger.getUniqueClassCount()));
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return executionDataStore;
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}
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/**
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* Loads an individual JaCoCo execution data file
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* This method is maintained for backward compatibility with tests
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*/
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private void loadExecFile(File execFile, ExecutionDataStore executionDataStore, SessionInfoStore sessionInfoStore) throws IOException {
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if (execFile == null || !execFile.exists()) {
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return;
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}
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290295
try (FileInputStream in = new FileInputStream(execFile)) {
291296
ExecutionDataReader reader = new ExecutionDataReader(in);
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reader.setExecutionDataVisitor(executionDataStore);
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reader.setSessionInfoVisitor(sessionInfoStore);
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reader.read();
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getLog().debug("Processed exec file: " + execFile);
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}
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}
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‎jacoco-console-reporter/src/test/java/io/github/svaningelgem/ExecutionDataMergerIntegrationTest.java

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package io.github.svaningelgem;
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import org.jacoco.core.data.ExecutionData;
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import org.jacoco.core.data.ExecutionDataStore;
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import org.jacoco.core.internal.data.CRC64;
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import org.junit.Before;
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import org.junit.Test;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.util.HashSet;
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import java.util.Set;
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import static org.junit.Assert.*;
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public class ExecutionDataMergerIntegrationTest extends BaseTestClass {
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private ExecutionDataMerger merger;
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private Set<File> execFiles;
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@Before
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public void setUp() throws Exception {
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super.setUp();
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merger = new ExecutionDataMerger();
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execFiles = new HashSet<>();
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}
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/**
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* Create a mock JaCoCo execution data file with sample data.
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* Note that this creates a simplified version of the file format.
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*/
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private File createMockExecFile(String className, boolean[] probes) throws IOException {
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File file = temporaryFolder.newFile();
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try (FileOutputStream out = new FileOutputStream(file)) {
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// JaCoCo exec file header
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out.write(0x01); // block type
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out.write(0xC0);
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out.write(0xC0);
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// Session info
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out.write(0x10); // block type
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writeInt(out, 8 + className.length()); // block length
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writeLong(out, System.currentTimeMillis()); // timestamp
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writeUTF(out, className); // id
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// Execution data
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out.write(0x11); // block type
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long classId = CRC64.classId(className.getBytes());
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int blockLength = 16 + className.length() + probes.length;
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writeInt(out, blockLength); // block length
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writeLong(out, classId); // class id
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writeUTF(out, className); // class name
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// Probes array
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writeInt(out, probes.length); // probes length
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for (boolean probe : probes) {
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out.write(probe ? 0x01 : 0x00);
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}
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// EOF block
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out.write(0x20); // block type
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writeInt(out, 0); // block length
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}
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return file;
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}
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private void writeInt(FileOutputStream out, int value) throws IOException {
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out.write((value >>> 24) & 0xFF);
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out.write((value >>> 16) & 0xFF);
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out.write((value >>> 8) & 0xFF);
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out.write(value & 0xFF);
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}
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private void writeLong(FileOutputStream out, long value) throws IOException {
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writeInt(out, (int)(value >>> 32));
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writeInt(out, (int)(value));
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}
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private void writeUTF(FileOutputStream out, String value) throws IOException {
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byte[] bytes = value.getBytes();
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writeInt(out, bytes.length);
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out.write(bytes);
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}
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@Test
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public void testLoadExecutionDataFromRealFiles() throws IOException {
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// This test attempts to create and read actual exec file format
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try {
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// Create mock execution data files with overlapping coverage
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File file1 = createMockExecFile("com.example.Test", new boolean[]{true, false, false});
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File file2 = createMockExecFile("com.example.Test", new boolean[]{false, true, false});
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execFiles.add(file1);
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execFiles.add(file2);
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// Load and merge the data
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ExecutionDataStore mergedStore = merger.loadExecutionData(execFiles);
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// This test may fail if our mock exec file format is not correct
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// which is OK - we're still testing compatibility with the real JaCoCo data format
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// in other test methods
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// If it works, we should have merged the execution data properly
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long classId = CRC64.classId("com.example.Test".getBytes());
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ExecutionData merged = mergedStore.get(classId);
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if (merged != null) {
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boolean[] probes = merged.getProbes();
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assertEquals(3, probes.length);
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assertTrue(probes[0]);
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assertTrue(probes[1]);
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assertFalse(probes[2]);
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}
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} catch (IOException e) {
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// If our mock file format is incorrect, this might fail
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// But we still want to make sure the merger handles invalid files gracefully
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System.err.println("Test failed creating mock exec file: " + e.getMessage());
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}
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}
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}

‎jacoco-console-reporter/src/test/java/io/github/svaningelgem/ExecutionDataMergerTest.java

Lines changed: 108 additions & 0 deletions
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package io.github.svaningelgem;
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import org.jacoco.core.data.ExecutionData;
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import org.jacoco.core.data.ExecutionDataStore;
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import org.jacoco.core.internal.data.CRC64;
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import org.junit.Before;
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import org.junit.Test;
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import java.io.File;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.util.HashSet;
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import java.util.Set;
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import static org.junit.Assert.*;
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public class ExecutionDataMergerTest extends BaseTestClass {
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private ExecutionDataMerger merger;
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private Set<File> execFiles;
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@Before
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public void setUp() throws Exception {
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super.setUp();
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merger = new ExecutionDataMerger();
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execFiles = new HashSet<>();
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}
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@Test
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public void testLoadExecutionDataEmptySet() throws IOException {
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ExecutionDataStore store = merger.loadExecutionData(execFiles);
31+
assertNotNull("Should return a non-null store even with empty set", store);
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assertEquals("No classes should be processed", 0, merger.getUniqueClassCount());
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}
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@Test
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public void testLoadExecutionDataWithNullFile() throws IOException {
37+
execFiles.add(null);
38+
ExecutionDataStore store = merger.loadExecutionData(execFiles);
39+
assertNotNull("Should handle null files gracefully", store);
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assertEquals("No classes should be processed", 0, merger.getUniqueClassCount());
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}
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@Test
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public void testLoadExecutionDataWithNonExistentFile() throws IOException {
45+
execFiles.add(new File("nonexistent.exec"));
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ExecutionDataStore store = merger.loadExecutionData(execFiles);
47+
assertNotNull("Should handle non-existent files gracefully", store);
48+
assertEquals("No classes should be processed", 0, merger.getUniqueClassCount());
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}
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@Test
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public void testLoadExecutionDataWithInvalidFile() throws IOException {
53+
File invalidFile = temporaryFolder.newFile("invalid.exec");
54+
Files.write(invalidFile.toPath(), "not a valid JaCoCo exec file".getBytes());
55+
execFiles.add(invalidFile);
56+
57+
try {
58+
merger.loadExecutionData(execFiles);
59+
fail("Should throw IOException for invalid file format");
60+
} catch (IOException e) {
61+
// Expected
62+
}
63+
}
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@Test
66+
public void testMergeExecutionDataWithNull() {
67+
// This should not throw an exception
68+
merger.mergeExecData(null);
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70+
// Verify no class was added
71+
assertEquals(0, merger.getUniqueClassCount());
72+
}
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74+
@Test
75+
public void testMergeExecutionData() {
76+
// Create test data
77+
String className = "com.example.TestClass";
78+
long classId = CRC64.classId(className.getBytes());
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80+
// First execution: probes [true, false, false]
81+
ExecutionData data1 = new ExecutionData(classId, className, new boolean[] {true, false, false});
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// Second execution: probes [false, true, false]
84+
ExecutionData data2 = new ExecutionData(classId, className, new boolean[] {false, true, false});
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86+
// Use the public method to merge data
87+
merger.mergeExecData(data1);
88+
merger.mergeExecData(data2);
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90+
// Get merged results
91+
ExecutionDataStore mergedStore = merger.getMergedStore();
92+
ExecutionData mergedData = mergedStore.get(classId);
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// Verify the merged result
95+
assertNotNull("Merged data should exist", mergedData);
96+
assertEquals("Class ID should match", classId, mergedData.getId());
97+
assertEquals("Class name should match", className, mergedData.getName());
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boolean[] expectedProbes = new boolean[] {true, true, false};
100+
boolean[] actualProbes = mergedData.getProbes();
101+
102+
assertEquals("Probe array length should match", expectedProbes.length, actualProbes.length);
103+
for (int i = 0; i < expectedProbes.length; i++) {
104+
assertEquals("Probe at index " + i + " should be merged correctly",
105+
expectedProbes[i], actualProbes[i]);
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}
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}
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}

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