speed up extracting archives with embedded postgres binaries

Author: tomix26

src/main/java/io/zonky/test/db/postgres/embedded/EmbeddedPostgres.java

@@ -14,24 +14,27 @@
 package io.zonky.test.db.postgres.embedded;
 
 
+import java.io.ByteArrayInputStream;
 import java.io.Closeable;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
-import java.io.OutputStream;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
 import java.net.ServerSocket;
 import java.net.Socket;
 import java.net.SocketException;
 import java.net.UnknownHostException;
+import java.nio.ByteBuffer;
+import java.nio.channels.AsynchronousFileChannel;
+import java.nio.channels.Channel;
+import java.nio.channels.CompletionHandler;
 import java.nio.channels.FileLock;
 import java.nio.channels.OverlappingFileLockException;
 import java.nio.file.FileSystems;
 import java.nio.file.Files;
 import java.nio.file.Path;
-import java.nio.file.Paths;
 import java.security.DigestInputStream;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
@@ -49,6 +52,7 @@
 import java.util.Map.Entry;
 import java.util.Objects;
 import java.util.UUID;
+import java.util.concurrent.Phaser;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicReference;
@@ -63,13 +67,17 @@
 import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
 import org.apache.commons.io.FileUtils;
 import org.apache.commons.io.IOUtils;
+import org.apache.commons.io.output.ByteArrayOutputStream;
 import org.apache.commons.lang3.SystemUtils;
 import org.apache.commons.lang3.time.StopWatch;
 import org.postgresql.ds.PGSimpleDataSource;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.tukaani.xz.XZInputStream;
 
+import static java.nio.file.StandardOpenOption.CREATE_NEW;
+import static java.nio.file.StandardOpenOption.WRITE;
+
 @SuppressWarnings("PMD.AvoidDuplicateLiterals") // "postgres"
 public class EmbeddedPostgres implements Closeable
 {
@@ -637,16 +645,15 @@ private static String getArchitecture()
      * Unpack archive compressed by tar with xz compression. By default system tar is used (faster). If not found, then the
      * java implementation takes place.
      *
-     * @param tbzPath The archive path.
+     * @param stream    A stream with the postgres binaries.
      * @param targetDir The directory to extract the content to.
      */
-    private static void extractTxz(String tbzPath, String targetDir) throws IOException
-    {
+    private static void extractTxz(InputStream stream, String targetDir) throws IOException {
         try (
-                InputStream in = Files.newInputStream(Paths.get(tbzPath));
-                XZInputStream xzIn = new XZInputStream(in);
+                XZInputStream xzIn = new XZInputStream(stream);
                 TarArchiveInputStream tarIn = new TarArchiveInputStream(xzIn)
         ) {
+            final Phaser phaser = new Phaser(1);
             TarArchiveEntry entry;
 
             while ((entry = tarIn.getNextTarEntry()) != null) {
@@ -663,9 +670,33 @@ private static void extractTxz(String tbzPath, String targetDir) throws IOExcept
                         throw new IllegalStateException("could not read " + individualFile);
                     }
                     mkdirs(fsObject.getParentFile());
-                    try (OutputStream outputFile = new FileOutputStream(fsObject)) {
-                        IOUtils.write(content, outputFile);
-                    }
+
+                    final AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(fsObject.toPath(), CREATE_NEW, WRITE);
+                    final ByteBuffer buffer = ByteBuffer.wrap(content);
+
+                    phaser.register();
+                    fileChannel.write(buffer, 0, fileChannel, new CompletionHandler<Integer, Channel>() {
+                        @Override
+                        public void completed(Integer written, Channel channel) {
+                            closeChannel(channel);
+                        }
+
+                        @Override
+                        public void failed(Throwable error, Channel channel) {
+                            LOG.error("Could not write file {}", fsObject.getAbsolutePath(), error);
+                            closeChannel(channel);
+                        }
+
+                        private void closeChannel(Channel channel) {
+                            try {
+                                channel.close();
+                            } catch (IOException e) {
+                                LOG.error("Unexpected error while closing the channel", e);
+                            } finally {
+                                phaser.arriveAndDeregister();
+                            }
+                        }
+                    });
                 } else if (entry.isDirectory()) {
                     mkdirs(fsObject);
                 } else {
@@ -678,6 +709,8 @@ private static void extractTxz(String tbzPath, String targetDir) throws IOExcept
                     fsObject.setExecutable(true);
                 }
             }
+
+            phaser.arriveAndAwaitAdvance();
         }
     }
 
@@ -694,10 +727,8 @@ private static File prepareBinaries(PgBinaryResolver pgBinaryResolver)
 
             LOG.info("Detected a {} {} system", system, machineHardware);
             File pgDir;
-            File pgTbz;
             final InputStream pgBinary;
             try {
-                pgTbz = File.createTempFile("pgpg", "pgpg");
                 pgBinary = pgBinaryResolver.getPgBinary(system, machineHardware);
             } catch (final IOException e) {
                 throw new ExceptionInInitializerError(e);
@@ -707,16 +738,12 @@ private static File prepareBinaries(PgBinaryResolver pgBinaryResolver)
                 throw new IllegalStateException("No Postgres binary found for " + system + " / " + machineHardware);
             }
 
-            try (DigestInputStream pgArchiveData = new DigestInputStream(
-                        pgBinary, MessageDigest.getInstance("MD5"));
-                FileOutputStream os = new FileOutputStream(pgTbz))
-            {
-                IOUtils.copy(pgArchiveData, os);
+            try (DigestInputStream pgArchiveData = new DigestInputStream(pgBinary, MessageDigest.getInstance("MD5"));
+                 ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
+                IOUtils.copy(pgArchiveData, baos);
                 pgArchiveData.close();
-                os.close();
 
                 String pgDigest = Hex.encodeHexString(pgArchiveData.getMessageDigest().digest());
-
                 pgDir = new File(getWorkingDirectory(), String.format("PG-%s", pgDigest));
 
                 mkdirs(pgDir);
@@ -725,14 +752,16 @@ private static File prepareBinaries(PgBinaryResolver pgBinaryResolver)
 
                 if (!pgDirExists.exists()) {
                     try (FileOutputStream lockStream = new FileOutputStream(unpackLockFile);
-                                    FileLock unpackLock = lockStream.getChannel().tryLock()) {
+                         FileLock unpackLock = lockStream.getChannel().tryLock()) {
                         if (unpackLock != null) {
                             try {
                                 if (pgDirExists.exists()) {
                                     throw new IllegalStateException("unpack lock acquired but .exists file is present " + pgDirExists);
                                 }
                                 LOG.info("Extracting Postgres...");
-                                extractTxz(pgTbz.getPath(), pgDir.getPath());
+                                try (ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray())) {
+                                    extractTxz(bais, pgDir.getPath());
+                                }
                                 if (!pgDirExists.createNewFile()) {
                                     throw new IllegalStateException("couldn't make .exists file " + pgDirExists);
                                 }
@@ -760,10 +789,6 @@ private static File prepareBinaries(PgBinaryResolver pgBinaryResolver)
             } catch (final InterruptedException ie) {
                 Thread.currentThread().interrupt();
                 throw new ExceptionInInitializerError(ie);
-            } finally {
-                if (!pgTbz.delete()) {
-                    LOG.warn("could not delete {}", pgTbz);
-                }
             }
             BINARY_DIR.set(pgDir);
             LOG.info("Postgres binaries at {}", pgDir);