add support for NIO getMulti, reduce lock contention, clean up native handler code

Author: gwhalin

build.xml

@@ -110,10 +110,11 @@
 		<jar compress="yes" jarfile="java_memcached-${ver}/java_memcached-${ver}.jar" basedir="java_memcached-${ver}/classes"/>
     </target>
 
-	<!-- compilation target for dev work -->
+	<!-- compilation target -->
 	<target name="compile">
 		<mkdir dir="${build.dir}"/>
-		<javac debug="yes" srcdir="${src.dir}" destdir="${build.dir}" deprecation="true">
+		<javac debug="yes" srcdir="${src.dir}" destdir="${build.dir}" deprecation="true" compiler="modern">
+			<compilerarg value="-Xlint:unchecked"/>
 			<classpath refid="project.class.path"/>
 		</javac>
 	</target>

src/com/danga/MemCached/LineInputStream.java

@@ -0,0 +1,35 @@
+/**
+ * src/com/danga/MemCached/LineInputStream.java
+ *
+ * @author $Author: $
+ * @version $Revision: $ $Date: $
+ * copyright (c) 2006 meetup, inc
+ *
+ * $Id: $
+ */
+package com.danga.MemCached;
+
+import java.io.IOException;
+
+public interface LineInputStream {
+    
+	/**
+	 * Read everything up to the next end-of-line.  Does
+	 * not include the end of line, though it is consumed
+	 * from the input.
+	 * @return  All next up to the next end of line.
+	 */
+	public String readLine() throws IOException;
+	
+	/**
+	 * Read everything up to and including the end of line.
+	 */
+	public void clearEOL() throws IOException;
+	
+	/**
+	 * Read some bytes.
+	 * @param buf   The buffer into which read. 
+	 * @return      The number of bytes actually read, or -1 if none could be read.
+	 */
+	public int read( byte[] buf ) throws IOException;
+}

src/com/danga/MemCached/Logger.java

@@ -126,6 +126,10 @@ public void debug( String mesg ) {
 		debug( mesg, null );
 	}
 
+	public boolean isDebugEnabled() {
+		return this.level <= LEVEL_DEBUG;
+	}
+	
 	/** 
 	 * logs info mesg 
 	 * 
@@ -143,6 +147,10 @@ public void info( String mesg ) {
 		info( mesg, null );
 	}
 
+	public boolean isInfoEnabled() {
+		return this.level <= LEVEL_INFO;
+	}
+	
 	/** 
 	 * logs warn mesg 
 	 *