Cleanup old JDK collection compatibility classes

Signed-off-by: mszabo-wikia <mszabo@wikia-inc.com>

core-common/src/main/java/org/glassfish/jersey/internal/util/JdkVersion.java

@@ -74,15 +74,20 @@ public static JdkVersion parseVersion(String versionString) {
             }
             final String[] parts = versionString.split("\\.|_");
             if (parts.length == 3) {
+                // e.g. "1.8.0" or "9.0.1"
                 return new JdkVersion(Integer.parseInt(parts[0]),
                         Integer.parseInt(parts[1]),
                         Integer.parseInt(parts[2]),
                         0);
-            } else {
+            } else if (parts.length == 4) {
+                // e.g. "1.8.0_141"
                 return new JdkVersion(Integer.parseInt(parts[0]),
                         Integer.parseInt(parts[1]),
                         Integer.parseInt(parts[2]),
                         Integer.parseInt(parts[3]));
+            } else {
+                // e.g "11"
+                return new JdkVersion(Integer.parseInt(parts[0]), 0, 0, 0);
             }
         } catch (final Exception e) {
             return UNKNOWN_VERSION;

core-common/src/main/java/org/glassfish/jersey/internal/util/collection/ByteBufferInputStream.java

@@ -19,6 +19,7 @@
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.LinkedTransferQueue;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicReference;
 
@@ -70,7 +71,7 @@ public final class ByteBufferInputStream extends NonBlockingInputStream {
      * to be read.
      */
     public ByteBufferInputStream() {
-        this.buffers = DataStructures.createLinkedTransferQueue();
+        this.buffers = new LinkedTransferQueue<>();
         this.current = null;
     }
 

core-common/src/main/java/org/glassfish/jersey/internal/util/collection/DataStructures.java

@@ -16,18 +16,11 @@
 
 package org.glassfish.jersey.internal.util.collection;
 
-import java.security.AccessController;
-import java.security.PrivilegedActionException;
-import java.security.PrivilegedExceptionAction;
 import java.util.Map;
 import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
-import java.util.concurrent.LinkedBlockingQueue;
-import java.util.logging.Level;
-import java.util.logging.Logger;
-
-import org.glassfish.jersey.internal.util.JdkVersion;
+import java.util.concurrent.LinkedTransferQueue;
 
 /**
  * Utility class, which tries to pickup the best collection implementation depending
@@ -39,33 +32,6 @@
  */
 public final class DataStructures {
 
-    private static final Class<?> LTQ_CLASS;
-
-    static {
-        String className = null;
-
-        Class<?> c;
-        try {
-            final JdkVersion jdkVersion = JdkVersion.getJdkVersion();
-            final JdkVersion minimumVersion = JdkVersion.parseVersion("1.7.0");
-
-            className = (minimumVersion.compareTo(jdkVersion) <= 0)
-                    ? "java.util.concurrent.LinkedTransferQueue"
-                    : "org.glassfish.jersey.internal.util.collection.LinkedTransferQueue";
-
-            c = getAndVerify(className);
-            Logger.getLogger(DataStructures.class.getName()).log(Level.FINE, "USING LTQ class:{0}", c);
-        } catch (final Throwable t) {
-            Logger.getLogger(DataStructures.class.getName()).log(Level.FINE,
-                    "failed loading data structure class:" + className
-                            + " fallback to embedded one", t);
-
-            c = LinkedBlockingQueue.class; // fallback to LinkedBlockingQueue
-        }
-
-        LTQ_CLASS = c;
-    }
-
     /**
      * Default concurrency level calculated based on the number of available CPUs.
      */
@@ -76,125 +42,92 @@ private static int ceilingNextPowerOfTwo(final int x) {
         return 1 << (Integer.SIZE - Integer.numberOfLeadingZeros(x - 1));
     }
 
-    private static Class<?> getAndVerify(final String cn) throws Throwable {
-        try {
-            return AccessController.doPrivileged(new PrivilegedExceptionAction<Class<?>>() {
-                @Override
-                public Class<?> run() throws Exception {
-                    return DataStructures.class.getClassLoader().loadClass(cn).newInstance().getClass();
-                }
-            });
-        } catch (final PrivilegedActionException ex) {
-            throw ex.getCause();
-        }
-    }
-
     /**
      * Create an instance of a {@link BlockingQueue} that is based on
-     * {@code LinkedTransferQueue} implementation from JDK 7.
+     * {@code LinkedTransferQueue} implementation, available in JDK 7 and above.
      * <p>
-     * When running on JDK 7 or higher, JDK {@code LinkedTransferQueue} implementation is used,
-     * on JDK 6 an internal Jersey implementation class is used.
+     * Originally, the method was used to provide backwards compatibility for JDK versions 6 and below.
+     * As those versions are now unsupported, callers should instantiate an {@link LinkedTransferQueue}
+     * directly instead of using this method.
      * </p>
      *
      * @param <E> the type of elements held in the queue.
      * @return new instance of a {@link BlockingQueue} that is based on {@code LinkedTransferQueue}
      *         implementation from JDK 7.
      */
-    @SuppressWarnings("unchecked")
+    @Deprecated
     public static <E> BlockingQueue<E> createLinkedTransferQueue() {
-        try {
-            return AccessController.doPrivileged(new PrivilegedExceptionAction<BlockingQueue<E>>() {
-                @Override
-                public BlockingQueue<E> run() throws Exception {
-                    return (BlockingQueue<E>) LTQ_CLASS.newInstance();
-                }
-            });
-        } catch (final PrivilegedActionException ex) {
-            final Throwable cause = ex.getCause();
-            if (cause instanceof RuntimeException) {
-                throw (RuntimeException) cause;
-            } else {
-                throw new RuntimeException(cause);
-            }
-        }
+        return new LinkedTransferQueue<>();
     }
 
     /**
      * Creates a new, empty map with a default initial capacity (16),
      * load factor (0.75) and concurrencyLevel (16).
      * <p>
-     * On Oracle JDK, the factory method will return an instance of
+     * The method was originally used to provide the
      * <a href="http://gee.cs.oswego.edu/dl/jsr166/dist/jsr166edocs/jsr166e/ConcurrentHashMapV8.html">
-     * {@code ConcurrentHashMapV8}</a>
-     * that is supposed to be available in JDK 8 and provides better performance and memory characteristics than
-     * {@link ConcurrentHashMap} implementation from JDK 7 or earlier. On non-Oracle JDK,
-     * the factory instantiates the standard {@code ConcurrentHashMap} from JDK.
+     * {@code ConcurrentHashMapV8}</a>, available in JDK 8 and above, for JDK 7 or earlier.
+     * As those versions are now unsupported, callers should instantiate an {@link ConcurrentHashMap}
+     * directly instead of using this method.
      * </p>
      *
      * @return the map.
      */
+    @Deprecated
     public static <K, V> ConcurrentMap<K, V> createConcurrentMap() {
-        return JdkVersion.getJdkVersion().isUnsafeSupported()
-                ? new ConcurrentHashMapV8<K, V>()
-                : new ConcurrentHashMap<K, V>();
+        return new ConcurrentHashMap<>();
     }
 
     /**
      * Creates a new map with the same mappings as the given map.
      * <p>
-     * On Oracle JDK, the factory method will return an instance of
+     * The method was originally used to provide the
      * <a href="http://gee.cs.oswego.edu/dl/jsr166/dist/jsr166edocs/jsr166e/ConcurrentHashMapV8.html">
-     * {@code ConcurrentHashMapV8}</a>
-     * that is supposed to be available in JDK 8 and provides better performance and memory characteristics than
-     * {@link ConcurrentHashMap} implementation from JDK 7 or earlier. On non-Oracle JDK,
-     * the factory instantiates the standard {@code ConcurrentHashMap} from JDK.
+     * {@code ConcurrentHashMapV8}</a>, available in JDK 8 and above, for JDK 7 or earlier.
+     * As those versions are now unsupported, callers should instantiate an {@link ConcurrentHashMap}
+     * directly instead of using this method.
      * </p>
      *
      * @param map the map.
      */
+    @Deprecated
     public static <K, V> ConcurrentMap<K, V> createConcurrentMap(
             final Map<? extends K, ? extends V> map) {
-        return JdkVersion.getJdkVersion().isUnsafeSupported()
-                ? new ConcurrentHashMapV8<K, V>(map)
-                : new ConcurrentHashMap<K, V>(map);
+        return new ConcurrentHashMap<>(map);
     }
 
     /**
      * Creates a new, empty map with an initial table size  accommodating the specified
      * number of elements without the need to dynamically resize.
      * <p>
-     * On Oracle JDK, the factory method will return an instance of
+     * The method was originally used to provide the
      * <a href="http://gee.cs.oswego.edu/dl/jsr166/dist/jsr166edocs/jsr166e/ConcurrentHashMapV8.html">
-     * {@code ConcurrentHashMapV8}</a>
-     * that is supposed to be available in JDK 8 and provides better performance and memory characteristics than
-     * {@link ConcurrentHashMap} implementation from JDK 7 or earlier. On non-Oracle JDK,
-     * the factory instantiates the standard {@code ConcurrentHashMap} from JDK.
+     * {@code ConcurrentHashMapV8}</a>, available in JDK 8 and above, for JDK 7 or earlier.
+     * As those versions are now unsupported, callers should instantiate an {@link ConcurrentHashMap}
+     * directly instead of using this method.
      * </p>
      *
      * @param initialCapacity The implementation performs internal
      *                        sizing to accommodate this many elements.
      * @throws IllegalArgumentException if the initial capacity of
      *                                  elements is negative.
      */
+    @Deprecated
     public static <K, V> ConcurrentMap<K, V> createConcurrentMap(
             final int initialCapacity) {
-        return JdkVersion.getJdkVersion().isUnsafeSupported()
-                ? new ConcurrentHashMapV8<K, V>(initialCapacity)
-                : new ConcurrentHashMap<K, V>(initialCapacity);
+        return new ConcurrentHashMap<>(initialCapacity);
     }
 
     /**
      * Creates a new, empty map with an initial table size based on the given number of elements
      * ({@code initialCapacity}), table density ({@code loadFactor}), and number of concurrently
      * updating threads ({@code concurrencyLevel}).
      * <p>
-     * On Oracle JDK, the factory method will return an instance of
+     * The method was originally used to provide the
      * <a href="http://gee.cs.oswego.edu/dl/jsr166/dist/jsr166edocs/jsr166e/ConcurrentHashMapV8.html">
-     * {@code ConcurrentHashMapV8}</a>
-     * that is supposed to be available in JDK 8 and provides better performance and memory characteristics than
-     * {@link ConcurrentHashMap} implementation from JDK 7 or earlier. On non-Oracle JDK,
-     * the factory instantiates the standard {@code ConcurrentHashMap} from JDK.
+     * {@code ConcurrentHashMapV8}</a>, available in JDK 8 and above, for JDK 7 or earlier.
+     * As those versions are now unsupported, callers should instantiate an {@link ConcurrentHashMap}
+     * directly instead of using this method.
      * </p>
      *
      * @param initialCapacity  the initial capacity. The implementation
@@ -209,11 +142,10 @@ public static <K, V> ConcurrentMap<K, V> createConcurrentMap(
      *                                  negative or the load factor or concurrencyLevel are
      *                                  not positive.
      */
+    @Deprecated
     public static <K, V> ConcurrentMap<K, V> createConcurrentMap(
             final int initialCapacity, final float loadFactor,
             final int concurrencyLevel) {
-        return JdkVersion.getJdkVersion().isUnsafeSupported()
-                ? new ConcurrentHashMapV8<K, V>(initialCapacity, loadFactor, concurrencyLevel)
-                : new ConcurrentHashMap<K, V>(initialCapacity, loadFactor, concurrencyLevel);
+        return new ConcurrentHashMap<>(initialCapacity, loadFactor, concurrencyLevel);
     }
 }