-package org.argeo.osgi.transaction;
-
-import java.io.Serializable;
-import java.nio.ByteBuffer;
-import java.util.Arrays;
-import java.util.UUID;
-
-import javax.transaction.xa.Xid;
-
-/**
- * Implementation of {@link Xid} based on {@link UUID}, using max significant
- * bits as global transaction id, and least significant bits as branch
- * qualifier.
- */
-public class UuidXid implements Xid, Serializable {
- private static final long serialVersionUID = -5380531989917886819L;
- public final static int FORMAT = (int) serialVersionUID;
-
- private final static int BYTES_PER_LONG = Long.SIZE / Byte.SIZE;
-
- private final int format;
- private final byte[] globalTransactionId;
- private final byte[] branchQualifier;
- private final String uuid;
- private final int hashCode;
-
- public UuidXid() {
- this(UUID.randomUUID());
- }
-
- public UuidXid(UUID uuid) {
- this.format = FORMAT;
- this.globalTransactionId = uuidToBytes(uuid.getMostSignificantBits());
- this.branchQualifier = uuidToBytes(uuid.getLeastSignificantBits());
- this.uuid = uuid.toString();
- this.hashCode = uuid.hashCode();
- }
-
- public UuidXid(Xid xid) {
- this(xid.getFormatId(), xid.getGlobalTransactionId(), xid
- .getBranchQualifier());
- }
-
- private UuidXid(int format, byte[] globalTransactionId,
- byte[] branchQualifier) {
- this.format = format;
- this.globalTransactionId = globalTransactionId;
- this.branchQualifier = branchQualifier;
- this.uuid = bytesToUUID(globalTransactionId, branchQualifier)
- .toString();
- this.hashCode = uuid.hashCode();
- }
-
- @Override
- public int getFormatId() {
- return format;
- }
-
- @Override
- public byte[] getGlobalTransactionId() {
- return Arrays.copyOf(globalTransactionId, globalTransactionId.length);
- }
-
- @Override
- public byte[] getBranchQualifier() {
- return Arrays.copyOf(branchQualifier, branchQualifier.length);
- }
-
- @Override
- public int hashCode() {
- return hashCode;
- }
-
- @Override
- public boolean equals(Object obj) {
- if (this == obj)
- return true;
- if (obj instanceof UuidXid) {
- UuidXid that = (UuidXid) obj;
- return Arrays.equals(globalTransactionId, that.globalTransactionId)
- && Arrays.equals(branchQualifier, that.branchQualifier);
- }
- if (obj instanceof Xid) {
- Xid that = (Xid) obj;
- return Arrays.equals(globalTransactionId,
- that.getGlobalTransactionId())
- && Arrays
- .equals(branchQualifier, that.getBranchQualifier());
- }
- return uuid.equals(obj.toString());
- }
-
- @Override
- protected Object clone() throws CloneNotSupportedException {
- return new UuidXid(format, globalTransactionId, branchQualifier);
- }
-
- @Override
- public String toString() {
- return uuid;
- }
-
- public UUID asUuid() {
- return bytesToUUID(globalTransactionId, branchQualifier);
- }
-
- public static byte[] uuidToBytes(long bits) {
- ByteBuffer buffer = ByteBuffer.allocate(BYTES_PER_LONG);
- buffer.putLong(0, bits);
- return buffer.array();
- }
-
- public static UUID bytesToUUID(byte[] most, byte[] least) {
- if (most.length < BYTES_PER_LONG)
- most = Arrays.copyOf(most, BYTES_PER_LONG);
- if (least.length < BYTES_PER_LONG)
- least = Arrays.copyOf(least, BYTES_PER_LONG);
- ByteBuffer buffer = ByteBuffer.allocate(2 * BYTES_PER_LONG);
- buffer.put(most, 0, BYTES_PER_LONG);
- buffer.put(least, 0, BYTES_PER_LONG);
- buffer.flip();
- return new UUID(buffer.getLong(), buffer.getLong());
- }
-
- // public static void main(String[] args) {
- // UUID uuid = UUID.randomUUID();
- // System.out.println(uuid);
- // uuid = bytesToUUID(uuidToBytes(uuid.getMostSignificantBits()),
- // uuidToBytes(uuid.getLeastSignificantBits()));
- // System.out.println(uuid);
- // }
-}