func (b *Writer) WriteString(s string) (int, error) {
	var sw io.StringWriter
	tryStringWriter := true

	nn := 0
	for len(s) > b.Available() && b.err == nil {
		var n int
		if b.Buffered() == 0 && sw == nil && tryStringWriter {
			// Check at most once whether b.wr is a StringWriter.
			sw, tryStringWriter = b.wr.(io.StringWriter)
		}
		if b.Buffered() == 0 && tryStringWriter {

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.GenericDeclaration;
import java.lang.reflect.Type;
import java.math.BigDecimal;
import java.math.BigInteger;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.GenericDeclaration;
import java.lang.reflect.Type;
import java.math.BigDecimal;
import java.math.BigInteger;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.net.URL;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

import org.codelibs.core.exception.IORuntimeException;
import org.codelibs.core.net.URLUtil;

	"math/rand"
	"os"
	"runtime"
	"strings"
	"sync"
	"testing"
	"time"
)

func TestRingBuffer_interface(t *testing.T) {
	rb := New(1)
	var _ io.Writer = rb
	var _ io.Reader = rb
	// var _ io.StringWriter = rb
	var _ io.ByteReader = rb
	var _ io.ByteWriter = rb
}

func TestRingBuffer_Write(t *testing.T) {
	rb := New(64)

	// check empty or full
	if !rb.IsEmpty() {