Don't keep all line graphs in memory during mining

Author: ibbem

src/main/java/org/variantsync/diffdetective/analysis/strategies/AnalyzeAllAndExport.java

@@ -0,0 +1,48 @@
+package org.variantsync.diffdetective.analysis.strategies;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.nio.file.Path;
+
+import org.apache.commons.io.output.CloseShieldOutputStream;
+import org.tinylog.Logger;
+import org.variantsync.diffdetective.datasets.Repository;
+import org.variantsync.diffdetective.diff.CommitDiff;
+import org.variantsync.diffdetective.util.IO;
+
+/**
+ * Collects all linegraph representations generated by an analysis and exports them at the end.
+ * @author Benjamin Moosherr
+ */
+public class AnalyzeAllAndExport extends AnalysisStrategy {
+    private OutputStream lineGraphDestination;
+
+    @Override
+    public void start(Repository repo, Path outputPath) {
+        try {
+            lineGraphDestination = IO.newBufferedOutputStream(outputPath);
+        } catch (IOException e) {
+            Logger.error(e);
+        }
+    }
+
+    @Override
+    public OutputStream onCommit(CommitDiff commit) {
+        try {
+            lineGraphDestination.flush();
+        } catch (IOException e) {
+            Logger.error(e);
+        }
+
+        return new CloseShieldOutputStream(lineGraphDestination);
+    }
+
+    @Override
+    public void end() {
+        try {
+            lineGraphDestination.close();
+        } catch (IOException e) {
+            Logger.error(e);
+        }
+    }
+}

src/main/java/org/variantsync/diffdetective/mining/DiffTreeMiner.java

@@ -6,7 +6,7 @@
 import org.variantsync.diffdetective.analysis.CommitHistoryAnalysisTaskFactory;
 import org.variantsync.diffdetective.analysis.HistoryAnalysis;
 import org.variantsync.diffdetective.analysis.strategies.AnalysisStrategy;
-import org.variantsync.diffdetective.analysis.strategies.AnalyzeAllThenExport;
+import org.variantsync.diffdetective.analysis.strategies.AnalyzeAllAndExport;
 import org.variantsync.diffdetective.datasets.*;
 import org.variantsync.diffdetective.datasets.predefined.StanciulescuMarlin;
 import org.variantsync.diffdetective.diff.difftree.filter.DiffTreeFilter;
@@ -87,7 +87,7 @@ public static LineGraphExportOptions MiningExportOptions(final Repository reposi
     }
 
     public static AnalysisStrategy MiningStrategy() {
-        return new AnalyzeAllThenExport();
+        return new AnalyzeAllAndExport();
 //                new CompositeDiffTreeMiningStrategy(
 //                        new MineAndExportIncrementally(1000),
 //                        new MiningMonitor(10)