package org.jgroups.protocols.pbcast;
import org.jgroups.Global;
import org.jgroups.View;
import org.jgroups.util.Digest;
import org.jgroups.util.Streamable;
import java.io.DataInput;
import java.io.DataOutput;
/**
* Result of a JOIN request (sent by the GMS client). Instances of this class are immutable.
*/
public class JoinRsp implements Streamable {
protected View view;
protected Digest digest;
protected String fail_reason; /** only set if JOIN failed, e.g. in AUTH */
protected static final byte VIEW_PRESENT = 1 << 0;
protected static final byte DIGEST_PRESENT = 1 << 1;
protected static final byte FAIL_REASON_PRESENT = 1 << 2;
public JoinRsp() {
}
public JoinRsp(View v, Digest d) {
view=v;
digest=d;
}
public JoinRsp(String fail_reason) {this.fail_reason=fail_reason;}
public View getView() {return view;}
public Digest getDigest() {return digest;}
public String getFailReason() {return fail_reason;}
public JoinRsp setFailReason(String r) {fail_reason=r; return this;}
public void writeTo(DataOutput out) throws Exception {
byte flags=0;
if(view != null)
flags|=VIEW_PRESENT;
if(digest != null)
flags|=DIGEST_PRESENT;
if(fail_reason != null)
flags|=FAIL_REASON_PRESENT;
out.writeByte(flags);
// 1. view
if(view != null)
view.writeTo(out);
// 2. digest
if(digest != null)
digest.writeTo(out, false); // don't write the membership; it is already present in the view
// 3. fail_reason
if(fail_reason != null)
out.writeUTF(fail_reason);
}
public void readFrom(DataInput in) throws Exception {
byte flags=in.readByte();
// 1. view
if((flags & VIEW_PRESENT) == VIEW_PRESENT) {
view=new View();
view.readFrom(in);
}
// 2. digest
if((flags & DIGEST_PRESENT) == DIGEST_PRESENT) {
digest=new Digest(view.getMembersRaw());
digest.readFrom(in, false);
}
// 3. fail_reason
if((flags & FAIL_REASON_PRESENT) == FAIL_REASON_PRESENT)
fail_reason=in.readUTF();
}
public int serializedSize() {
int retval=Global.BYTE_SIZE; // flags
if(view != null)
retval+=view.serializedSize();
if(digest != null)
retval+=digest.serializedSize(false);
if(fail_reason != null)
retval+=fail_reason.length() +2;
return retval;
}
public String toString() {
StringBuilder sb=new StringBuilder();
if(view != null)
sb.append("view: ").append(view);
if(digest != null)
sb.append(", digest: ").append(digest);
if(fail_reason != null)
sb.append("fail reason: ").append(fail_reason);
return sb.toString();
}
}