private boolean writeValue(ByteBuffer dst) {
if (!isPersistStatusSet(PERSIST_VALUE)) {
if (size > 0) {
// the number of bytes that can be written to the bb.
int bytesWritable = dst.remaining();
// the number of bytes that need to be written.
int bytesNeeded = size - valueOffset;
int bytesWrite;
boolean done;
if (bytesWritable >= bytesNeeded) {
// All bytes for the value are available.
bytesWrite = bytesNeeded;
done = true;
} else {
// Not all bytes for the value are available. So lets write as much as is available.
bytesWrite = bytesWritable;
done = false;
}
byte[] byteArray = toByteArray();
dst.put(byteArray, valueOffset, bytesWrite);
valueOffset += bytesWrite;
if (!done) {
return false;
}
}
setPersistStatus(PERSIST_VALUE);
}
return true;
}
private boolean readValue(ByteBuffer src) {
if (!isPersistStatusSet(PERSIST_VALUE)) {
if (payload == null) {
payload = new byte[size];
}
if (size > 0) {
int bytesReadable = src.remaining();
int bytesNeeded = size - valueOffset;
boolean done;
int bytesRead;
if (bytesReadable >= bytesNeeded) {
bytesRead = bytesNeeded;
done = true;
} else {
bytesRead = bytesReadable;
done = false;
}
// read the data from the byte-buffer into the bytes-array.
src.get(payload, valueOffset, bytesRead);
valueOffset += bytesRead;
if (!done) {
return false;
}
}
setPersistStatus(PERSIST_VALUE);
}
return true;
}
private boolean writePartition(ByteBuffer dst) {
if (!isPersistStatusSet(PERSIST_PARTITION)) {
if (dst.remaining() < Bits.INT_SIZE_IN_BYTES) {
return false;
}
dst.putInt(partitionId);
setPersistStatus(PERSIST_PARTITION);
}
return true;
}
private boolean readSize(ByteBuffer src) {
if (!isPersistStatusSet(PERSIST_SIZE)) {
if (src.remaining() < INT_SIZE_IN_BYTES) {
return false;
}
size = src.getInt();
setPersistStatus(PERSIST_SIZE);
}
return true;
}
private boolean writeHeader(ByteBuffer dst) {
if (!isPersistStatusSet(PERSIST_HEADER)) {
if (dst.remaining() < Bits.SHORT_SIZE_IN_BYTES) {
return false;
}
dst.putShort(header);
setPersistStatus(PERSIST_HEADER);
}
return true;
}
private boolean readPartition(ByteBuffer src) {
if (!isPersistStatusSet(PERSIST_PARTITION)) {
if (src.remaining() < 4) {
return false;
}
partitionId = src.getInt();
setPersistStatus(PERSIST_PARTITION);
}
return true;
}
private boolean readHeader(ByteBuffer src) {
if (!isPersistStatusSet(PERSIST_HEADER)) {
if (src.remaining() < 2) {
return false;
}
header = src.getShort();
setPersistStatus(PERSIST_HEADER);
}
return true;
}
private boolean writeVersion(ByteBuffer dst) {
if (!isPersistStatusSet(PERSIST_VERSION)) {
if (!dst.hasRemaining()) {
return false;
}
dst.put(VERSION);
setPersistStatus(PERSIST_VERSION);
}
return true;
}
private boolean writeSize(ByteBuffer dst) {
if (!isPersistStatusSet(PERSIST_SIZE)) {
if (dst.remaining() < INT_SIZE_IN_BYTES) {
return false;
}
size = totalSize();
dst.putInt(size);
setPersistStatus(PERSIST_SIZE);
}
return true;
}
private boolean readVersion(ByteBuffer src) {
if (!isPersistStatusSet(PERSIST_VERSION)) {
if (!src.hasRemaining()) {
return false;
}
byte version = src.get();
setPersistStatus(PERSIST_VERSION);
if (VERSION != version) {
throw new IllegalArgumentException(
"Packet versions are not matching! Expected -> "
+ VERSION
+ ", Incoming -> "
+ version);
}
}
return true;
}
public boolean readFrom(ByteBuffer src) {
if (!readVersion(src)) {
return false;
}
if (!readHeader(src)) {
return false;
}
if (!readPartition(src)) {
return false;
}
if (!readSize(src)) {
return false;
}
if (!readValue(src)) {
return false;
}
setPersistStatus(PERSIST_COMPLETED);
return true;
}
public boolean writeTo(ByteBuffer dst) {
if (!writeVersion(dst)) {
return false;
}
if (!writeHeader(dst)) {
return false;
}
if (!writePartition(dst)) {
return false;
}
if (!writeSize(dst)) {
return false;
}
if (!writeValue(dst)) {
return false;
}
setPersistStatus(PERSIST_COMPLETED);
return true;
}