Ensure backward compatibility

.. by resurrecting the removed methods and system properties.

buffer/src/main/java/io/netty/buffer/WrappedByteBuf.java

@@ -27,7 +27,7 @@ import java.nio.channels.GatheringByteChannel;
 import java.nio.channels.ScatteringByteChannel;
 import java.nio.charset.Charset;
 
-public class WrappedByteBuf extends ByteBuf {
+class WrappedByteBuf extends ByteBuf {
 
     protected final ByteBuf buf;
 

common/src/main/java/io/netty/util/ResourceLeakDetector.java

@@ -66,7 +66,14 @@ public final class ResourceLeakDetector<T> {
     private static final InternalLogger logger = InternalLoggerFactory.getInstance(ResourceLeakDetector.class);
 
     static {
-        String levelStr = SystemPropertyUtil.get(PROP_LEVEL, DEFAULT_LEVEL.name()).trim().toUpperCase();
+        final boolean disabled = SystemPropertyUtil.getBoolean("io.netty.noResourceLeakDetection", false);
+        logger.debug("-Dio.netty.noResourceLeakDetection: {}", disabled);
+        logger.warn(
+                "-Dio.netty.noResourceLeakDetection is deprecated. Use '-D{}={}' instead.",
+                PROP_LEVEL, DEFAULT_LEVEL.name().toLowerCase());
+
+        Level defaultLevel = disabled? Level.DISABLED : DEFAULT_LEVEL;
+        String levelStr = SystemPropertyUtil.get(PROP_LEVEL, defaultLevel.name()).trim().toUpperCase();
         Level level = DEFAULT_LEVEL;
         for (Level l: EnumSet.allOf(Level.class)) {
             if (levelStr.equals(l.name()) || levelStr.equals(String.valueOf(l.ordinal()))) {
@@ -82,6 +89,21 @@ public final class ResourceLeakDetector<T> {
 
     private static final int DEFAULT_SAMPLING_INTERVAL = 113;
 
+    /**
+     * @deprecated Use {@link #setLevel(ResourceLeakDetector.Level)} instead.
+     */
+    @Deprecated
+    public static void setEnabled(boolean enabled) {
+        setLevel(enabled? Level.SIMPLE : Level.DISABLED);
+    }
+
+    /**
+     * Returns {@code true} if resource leak detection is enabled.
+     */
+    public static boolean isEnabled() {
+        return getLevel().ordinal() > Level.DISABLED.ordinal();
+    }
+
     /**
      * Sets the resource leak detection level.
      */

common/src/main/java/io/netty/util/ResourceLeakException.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright 2013 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+package io.netty.util;
+
+import java.util.Arrays;
+
+/**
+ * @deprecated This class will be removed in the future version.
+ */
+@Deprecated
+public class ResourceLeakException extends RuntimeException {
+
+    private static final long serialVersionUID = 7186453858343358280L;
+
+    private final StackTraceElement[] cachedStackTrace;
+
+    public ResourceLeakException() {
+        cachedStackTrace = getStackTrace();
+    }
+
+    public ResourceLeakException(String message) {
+        super(message);
+        cachedStackTrace = getStackTrace();
+    }
+
+    public ResourceLeakException(String message, Throwable cause) {
+        super(message, cause);
+        cachedStackTrace = getStackTrace();
+    }
+
+    public ResourceLeakException(Throwable cause) {
+        super(cause);
+        cachedStackTrace = getStackTrace();
+    }
+
+    @Override
+    public int hashCode() {
+        StackTraceElement[] trace  = cachedStackTrace;
+        int hashCode = 0;
+        for (StackTraceElement e: trace) {
+            hashCode = hashCode * 31 + e.hashCode();
+        }
+        return hashCode;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (!(o instanceof ResourceLeakException)) {
+            return false;
+        }
+        if (o == this) {
+            return true;
+        }
+
+        return Arrays.equals(cachedStackTrace, ((ResourceLeakException) o).cachedStackTrace);
+    }
+}