Migrate to Java 21 FFM API

.github/workflows/auto-jdk-matrix.yml

@@ -18,7 +18,7 @@ jobs:
           fail-fast: false
 
         env:
-          JDK_VERSION: 17
+          JDK_VERSION: 21
 
         steps:
         - name: "Checkout ${{ github.ref }} ( ${{ github.sha }} )"
@@ -36,7 +36,7 @@ jobs:
               distribution: 'temurin'
               java-package: jdk
               architecture: x64
-              java-version: 17        
+              java-version: 21
 
         - name: Cache local Maven repository
           uses: actions/cache@v4

.github/workflows/auto-os-matrix.yml

@@ -17,7 +17,7 @@ jobs:
           fail-fast: false
 
           matrix:
-            jdk: [ 17 ]
+            jdk: [ 21 ]
             os: [ windows-latest, ubuntu-latest, macos-latest ]
             include:
               - os: windows-latest

.github/workflows/javadoc.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Setup Java
         uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
 
       - name: Echo Java Version

.gitignore

@@ -13,6 +13,9 @@ datasketches-memory*/.gitignore
 *.ipr
 *.iws
 
+# Netbeans project files
+nb-configuration.xml
+
 # Additional tools
 .clover/
 

pom.xml

@@ -89,10 +89,10 @@ under the License.
 
     <!-- System-wide properties -->
     <maven.version>3.6.3</maven.version>
-    <java.version>17</java.version>
+    <java.version>21</java.version>
     <maven.compiler.source>${java.version}</maven.compiler.source>
     <maven.compiler.target>${java.version}</maven.compiler.target>
-    <argLine>-Xmx4g -Duser.language=en -Duser.country=US -Dfile.encoding=UTF-8 --add-modules=jdk.incubator.foreign</argLine>
+    <argLine>-Xmx4g -Duser.language=en -Duser.country=US -Dfile.encoding=UTF-8 --enable-preview</argLine>
     <charset.encoding>UTF-8</charset.encoding>
     <project.build.sourceEncoding>${charset.encoding}</project.build.sourceEncoding>
     <project.build.resourceEncoding>${charset.encoding}</project.build.resourceEncoding>
@@ -160,8 +160,9 @@ under the License.
           <artifactId>maven-compiler-plugin</artifactId>
           <version>${maven-compiler-plugin.version}</version>
           <configuration>
+            <release>21</release>
             <compilerArgs>
-              <arg>--add-modules=jdk.incubator.foreign</arg>
+              <arg>--enable-preview</arg>
             </compilerArgs>
           </configuration>
         </plugin>
@@ -187,7 +188,7 @@ under the License.
               <configuration>
                 <rules>
                   <requireJavaVersion>
-                    <version>[17,18)</version>
+                    <version>21</version>
                   </requireJavaVersion>
                   <requireMavenVersion>
                     <version>[${maven.version},4.0.0)</version>
@@ -235,7 +236,7 @@ under the License.
             <excludePackageNames>org.apache.datasketches.memory/internal</excludePackageNames>
             <show>public</show>
             <additionalOptions>
-              <additionalOption>--add-modules=jdk.incubator.foreign</additionalOption>
+              <additionalOption>--enable-preview</additionalOption>
             </additionalOptions>
           </configuration>
           <executions>
@@ -281,7 +282,7 @@ under the License.
           <artifactId>maven-surefire-plugin</artifactId>
           <version>${maven-surefire-failsafe-plugins.version}</version>
           <configuration>
-            <argLine>--add-modules=jdk.incubator.foreign</argLine>
+            <argLine>--enable-preview</argLine>
             <trimStackTrace>false</trimStackTrace>
             <useManifestOnlyJar>false</useManifestOnlyJar>
             <redirectTestOutputToFile>true</redirectTestOutputToFile>
@@ -307,6 +308,7 @@ under the License.
             <useDefaultExcludes>true</useDefaultExcludes>
             <excludes>
               <!-- rat uses .gitignore for excludes by default -->
+<!--              <exclude>**/nb-configuration.xml</exclude>-->
               <exclude>**/*.yaml</exclude>
               <exclude>**/*.yml</exclude>
               <exclude>**/.*</exclude>

src/main/java/org/apache/datasketches/memory/Buffer.java

@@ -19,6 +19,7 @@
 
 package org.apache.datasketches.memory;
 
+import java.lang.foreign.Arena;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 

src/main/java/org/apache/datasketches/memory/DefaultMemoryRequestServer.java

@@ -19,10 +19,9 @@
 
 package org.apache.datasketches.memory;
 
+import java.lang.foreign.Arena;
 import java.nio.ByteOrder;
 
-import jdk.incubator.foreign.ResourceScope;
-
 /**
  * This example MemoryRequestServer is simple but demonstrates one of many ways to
  * manage continuous requests for larger memory.
@@ -59,7 +58,7 @@ public DefaultMemoryRequestServer(
   public WritableMemory request(
       final WritableMemory currentWmem,
       final long newCapacityBytes,
-      final ResourceScope scope) {
+      final Arena arena) {
     final ByteOrder order = currentWmem.getTypeByteOrder();
     final long currentBytes = currentWmem.getCapacity();
     final WritableMemory newWmem;
@@ -69,7 +68,7 @@ public WritableMemory request(
     }
 
     if (offHeap) {
-      newWmem = WritableMemory.allocateDirect(newCapacityBytes, 8, scope, order, this);
+      newWmem = WritableMemory.allocateDirect(arena, newCapacityBytes, 8, order, this);
     }
     else { //On-heap
       if (newCapacityBytes > Integer.MAX_VALUE) {
@@ -90,7 +89,7 @@ public void requestClose(
       final WritableMemory memToClose,
       final WritableMemory newMemory) {
     //make this operation idempotent.
-    if (memToClose.isCloseable()) { memToClose.scope().close(); }
+    if (memToClose.isCloseable()) { memToClose.close(); }
   }
 
 }

src/main/java/org/apache/datasketches/memory/Memory.java

@@ -22,13 +22,15 @@
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.IOException;
+import java.lang.foreign.Arena;
+import java.lang.foreign.MemorySegment;
+import java.lang.foreign.MemorySegment.Scope;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
+import java.util.Objects;
 
 import org.apache.datasketches.memory.internal.WritableMemoryImpl;
 
-import jdk.incubator.foreign.MemorySegment;
-import jdk.incubator.foreign.ResourceScope;
 
 /**
  * Defines the read-only API for offset access to a resource.
@@ -74,8 +76,9 @@ static Memory wrap(
   /**
    * Maps the given file into <i>Memory</i> for read operations
    * Calling this method is equivalent to calling
-   * {@link #map(File, long, long, ByteOrder)
+   * {@link #map(Arena, File, long, long, ByteOrder)
    * map(file, 0, file.length(), scope, ByteOrder.nativeOrder())}.
+   * @param arena the given arena. It must be non-null.
    * @param file the given file to map. It must be non-null with a non-negative length and readable.
    * @return <i>Memory</i> for managing the mapped memory.
    * @throws IllegalArgumentException if path is not associated with the default file system.
@@ -84,12 +87,13 @@ static Memory wrap(
    * @throws SecurityException If a security manager is installed and it denies an unspecified permission
    * required by the implementation.
    */
-  static Memory map(File file) throws IOException {
-    return map(file, 0, file.length(), ByteOrder.nativeOrder());
+  static Memory map(Arena arena, File file) throws IOException {
+    return map(arena, file, 0, file.length(), ByteOrder.nativeOrder());
   }
 
   /**
    * Maps the specified portion of the given file into <i>Memory</i> for read operations.
+   * @param arena the given arena. It must be non-null.
    * @param file the given file to map. It must be non-null,readable and length &ge; 0.
    * @param fileOffsetBytes the position in the given file in bytes. It must not be negative.
    * @param capacityBytes the size of the mapped memory. It must not be negative..
@@ -102,39 +106,12 @@ static Memory map(File file) throws IOException {
    * required by the implementation.
    */
   static Memory map(
+      Arena arena,
       File file,
       long fileOffsetBytes,
       long capacityBytes,
       ByteOrder byteOrder) throws IOException {
-    final ResourceScope scope = ResourceScope.newConfinedScope();
-    return WritableMemoryImpl.wrapMap(file, fileOffsetBytes, capacityBytes, scope, true, byteOrder);
-  }
-
-  /**
-   * Maps the specified portion of the given file into <i>Memory</i> for read operations with a ResourceScope.
-   * @param file the given file to map. It must be non-null, readable and length &ge; 0.
-   * @param fileOffsetBytes the position in the given file in bytes. It must not be negative.
-   * @param capacityBytes the size of the mapped memory. It must not be negative.
-   * @param scope the given ResourceScope.
-   * It must be non-null.
-   * Typically use <i>ResourceScope.newConfinedScope()</i>.
-   * Warning: specifying a <i>newSharedScope()</i> is not supported.
-   * @param byteOrder the byte order to be used.  It must be non-null.
-   * @return <i>Memory</i> for managing the mapped memory.
-   * @throws IllegalArgumentException  if path is not associated with the default file system.
-   * @throws IllegalStateException - if scope has been already closed, or if access occurs from a thread other
-   * than the thread owning scope.
-   * @throws IOException - if the specified path does not point to an existing file, or if some other I/O error occurs.
-   * @throws SecurityException - If a security manager is installed and it denies an unspecified permission
-   * required by the implementation.
-   */
-  static Memory map(
-      File file,
-      long fileOffsetBytes,
-      long capacityBytes,
-      ResourceScope scope,
-      ByteOrder byteOrder) throws IOException {
-    return WritableMemoryImpl.wrapMap(file, fileOffsetBytes, capacityBytes, scope, true, byteOrder);
+    return WritableMemoryImpl.wrapMap(arena, file, fileOffsetBytes, capacityBytes, true, byteOrder);
   }
 
   //NO ALLOCATE DIRECT, makes no sense

src/main/java/org/apache/datasketches/memory/MemoryRequestServer.java

@@ -19,21 +19,21 @@
 
 package org.apache.datasketches.memory;
 
-import jdk.incubator.foreign.ResourceScope;
+import java.lang.foreign.Arena;
 
 /**
  * The MemoryRequestServer is a callback interface to provide a means to request more memory
  * for heap and off-heap WritableMemory resources that are not file-memory-mapped backed resources.
  *
- * <p>Note: this only works with Java 17.
+ * <p>Note: this only works with Java 21.
  *
  * @author Lee Rhodes
  */
 public interface MemoryRequestServer {
 
   /**
    * Request new WritableMemory with the given newCapacityBytes. The current WritableMemory can be used to
-   * determine the byte order of the returned WritableMemory and other properties. A new confined ResourceScope is
+   * determine the byte order of the returned WritableMemory and other properties. A new confined Arena is
    * assigned.
    * @param currentWritableMemory the current writableMemory of the client. It must be non-null.
    * @param newCapacityBytes The capacity being requested. It must be &gt; the capacity of the currentWritableMemory.
@@ -42,24 +42,24 @@ public interface MemoryRequestServer {
   default WritableMemory request(
       WritableMemory currentWritableMemory,
       long newCapacityBytes) {
-    return request(currentWritableMemory, newCapacityBytes, ResourceScope.newConfinedScope());
+
+    return request(currentWritableMemory, newCapacityBytes, Arena.ofConfined());
   }
 
   /**
    * Request new WritableMemory with the given newCapacityBytes. The current Writable Memory can be used to
    * determine the byte order of the returned WritableMemory and other properties.
    * @param currentWritableMemory the current writableMemory of the client. It must be non-null.
    * @param newCapacityBytes The capacity being requested. It must be &gt; the capacity of the currentWritableMemory.
-   * @param scope the ResourceScope to be used for the newly allocated memory.
-   * It must be non-null.
-   * Typically use <i>ResourceScope.newConfinedScope()</i>.
-   * Warning: specifying a <i>newSharedScope()</i> is not supported.
+   * @param arena the Arena to be used for the newly allocated memory. It must be non-null.
+   * Typically use <i>Arena.ofConfined()</i>.
+   * Warning: specifying a <i>Arena.ofShared()</i> is not supported.
    * @return new WritableMemory with the requested capacity.
    */
   WritableMemory request(
       WritableMemory currentWritableMemory,
       long newCapacityBytes,
-      ResourceScope scope);
+      Arena arena);
 
   /**
    * Request to close the resource, if applicable.