Fix static analysis

Author: wiwa

src/main/java/build/buildfarm/worker/persistent/FileAccessUtils.java

@@ -11,14 +11,18 @@
 import java.util.logging.Logger;
 
 // Utility for concurrent move/copy/link of files
-public class FileAccessUtils {
+public final class FileAccessUtils {
+  // singleton class with only static methods
+  private FileAccessUtils() {}
+
   private static final Logger logger = Logger.getLogger(FileAccessUtils.class.getName());
 
-  private static final ConcurrentHashMap<Path, EasyMonitor> fileLocks = new ConcurrentHashMap<>();
+  private static final ConcurrentHashMap<Path, PathLock> fileLocks = new ConcurrentHashMap<>();
 
   // Used here for locking "files"
-  private static class EasyMonitor {
-    public EasyMonitor() {}
+  private static class PathLock {
+    // Not used elsewhere
+    private PathLock() {}
   }
 
   /**
@@ -130,7 +134,7 @@ public static void linkFile(Path from, Path to) throws IOException {
    */
   public static void deleteFileIfExists(Path toDelete) throws IOException {
     Path absTo = toDelete.toAbsolutePath();
-    EasyMonitor toLock = fileLock(absTo);
+    PathLock toLock = fileLock(absTo);
     synchronized (toLock) {
       try {
         Files.deleteIfExists(absTo);
@@ -148,7 +152,7 @@ public static void deleteFileIfExists(Path toDelete) throws IOException {
    * <p>It is up to the write operation to specify whether or not to overwrite existing files.
    */
   private static IOException writeFileSafe(Path absTo, Supplier<IOException> writeOp) {
-    EasyMonitor toLock = fileLock(absTo);
+    PathLock toLock = fileLock(absTo);
     synchronized (toLock) {
       try {
         // If 'absTo' is a symlink, checks if its target file exists
@@ -164,7 +168,7 @@ private static IOException writeFileSafe(Path absTo, Supplier<IOException> write
   }
 
   // "Logical" file lock
-  private static EasyMonitor fileLock(Path writeTo) {
-    return fileLocks.computeIfAbsent(writeTo, k -> new EasyMonitor());
+  private static PathLock fileLock(Path writeTo) {
+    return fileLocks.computeIfAbsent(writeTo, k -> new PathLock());
   }
 }

src/main/java/build/buildfarm/worker/persistent/ProtoCoordinator.java

@@ -73,11 +73,11 @@ public PersistentWorker create(WorkerKey workerKey) throws Exception {
               StringBuilder initArgs = new StringBuilder();
               for (String s : workerKey.getCmd()) {
                 initArgs.append(s);
-                initArgs.append("\n");
+                initArgs.append('\n');
               }
               for (String s : workerKey.getArgs()) {
                 initArgs.append(s);
-                initArgs.append("\n");
+                initArgs.append('\n');
               }
 
               Files.write(initArgsLogFile, initArgs.toString().getBytes());
@@ -178,17 +178,16 @@ public ResponseCtx postWorkCleanup(
   private IOException logBadCleanup(RequestCtx request, IOException e) {
     WorkFilesContext context = request.filesContext;
 
-    StringBuilder sb = new StringBuilder();
-    sb.append(
-        "Output files failure debug for request with args<"
-            + request.request.getArgumentsList()
-            + ">:\n");
-    sb.append("getOutputPathsList:\n");
-    sb.append(context.outputPaths);
-    sb.append("getOutputFilesList:\n");
-    sb.append(context.outputFiles);
-    sb.append("getOutputDirectoriesList:\n");
-    sb.append(context.outputDirectories);
+    StringBuilder sb = new StringBuilder(122);
+    sb.append("Output files failure debug for request with args<")
+        .append(request.request.getArgumentsList())
+        .append(">:\ngetOutputPathsList:\n")
+        .append(context.outputPaths)
+        .append("getOutputFilesList:\n")
+        .append(context.outputFiles)
+        .append("getOutputDirectoriesList:\n")
+        .append(context.outputDirectories);
+
     logger.severe(sb.toString());
 
     e.printStackTrace();

src/main/java/build/buildfarm/worker/persistent/WorkerInputs.java

@@ -6,11 +6,8 @@
 import com.google.protobuf.ByteString;
 import java.io.IOException;
 import java.nio.file.Path;
-import java.nio.file.Paths;
-import java.util.ArrayList;
 import java.util.List;
 import java.util.logging.Logger;
-import persistent.common.util.Args;
 
 public class WorkerInputs {
   private static final Logger logger = Logger.getLogger(WorkerInputs.class.getName());
@@ -114,17 +111,4 @@ public static WorkerInputs from(WorkFilesContext workFilesContext, List<String>
 
     return new WorkerInputs(workFilesContext.opRoot, absToolInputs, toolInputs, pathInputs);
   }
-
-  private static List<Path> argsFiles(Path opRoot, List<String> reqArgs) {
-    List<Path> files = new ArrayList<>();
-    for (String a : reqArgs) {
-      if (Args.isArgsFile(a)) {
-        try {
-          files.add(opRoot.resolve(Paths.get(a.substring(1))));
-        } catch (Exception ignored) {
-        }
-      }
-    }
-    return files;
-  }
 }