public static int encodedPageSize(Page p) {
return Dlugosz.bytesToEncode(p.getPageNumber())
+ Dlugosz.bytesToEncode(p.getByteOffset())
+ Dlugosz.bytesToEncode(p.getTimeOffset())
+ p.getData().limit();
}
public static int encodedPageInfoSize(PageInfo pi) {
return Dlugosz.bytesToEncode(pi.getPageNumber())
+ Dlugosz.bytesToEncode(pi.getByteOffset())
+ Dlugosz.bytesToEncode(pi.getTimeOffset())
+ Dlugosz.bytesToEncode(pi.getLength());
}
/**
* Removed the encoding stuff from the Page and PageInfo beans so they are just POJOs This is only
* really relevant to mina, so they need not be in the external API Also, removed robonobo-common
* dependency on mina-api
*
* @author ray
*/
public class PageUtil {
// 4 fields
private static final int MAX_PAGEINFO_SZ = 4 * Dlugosz.bytesToEncode(Long.MAX_VALUE);
public static PageInfo decodePageInfo(ByteChannel chan) throws IOException {
PageInfo pi = new PageInfo();
pi.setPageNumber(Dlugosz.readLong(chan));
pi.setLength(Dlugosz.readLong(chan));
pi.setByteOffset(Dlugosz.readLong(chan));
pi.setTimeOffset(Dlugosz.readLong(chan));
return pi;
}
public static void encodePageInfo(PageInfo pi, ByteBuffer buf) {
Dlugosz.encode(pi.getPageNumber(), buf);
Dlugosz.encode(pi.getLength(), buf);
Dlugosz.encode(pi.getByteOffset(), buf);
Dlugosz.encode(pi.getTimeOffset(), buf);
}
public static int encodedPageSize(Page p) {
return Dlugosz.bytesToEncode(p.getPageNumber())
+ Dlugosz.bytesToEncode(p.getByteOffset())
+ Dlugosz.bytesToEncode(p.getTimeOffset())
+ p.getData().limit();
}
public static int encodedPageInfoSize(PageInfo pi) {
return Dlugosz.bytesToEncode(pi.getPageNumber())
+ Dlugosz.bytesToEncode(pi.getByteOffset())
+ Dlugosz.bytesToEncode(pi.getTimeOffset())
+ Dlugosz.bytesToEncode(pi.getLength());
}
public static int maxPageInfoSize() {
return MAX_PAGEINFO_SZ;
}
public static Page decodePage(ByteBuffer buf) throws IOException {
Page p = new Page();
buf.position(0);
p.setPageNumber(Dlugosz.readLong(buf));
p.setByteOffset(Dlugosz.readLong(buf));
p.setTimeOffset(Dlugosz.readLong(buf));
p.setData(buf.slice());
return p;
}
/** Gets the page, including metadata, as a byte buffer ready for sending over the network */
public static ByteBuffer pageToByteBuffer(Page p) {
int bufLen = encodedPageSize(p);
ByteBuffer result = ByteBuffer.allocate(bufLen);
Dlugosz.encode(p.getPageNumber(), result);
Dlugosz.encode(p.getByteOffset(), result);
Dlugosz.encode(p.getTimeOffset(), result);
p.getData().flip();
result.put(p.getData());
return result;
}
}