package org.robotninjas.barge.tools;
import com.google.common.base.Optional;
import journal.io.api.Journal;
import journal.io.api.JournalBuilder;
import journal.io.api.Location;
import org.robotninjas.barge.api.*;
import java.io.File;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
/**
* For now this is just a simple program to print the contents of the log. I envision
* this turning into a generic tool for working with the log.
*
*/
public class LogTool {
private static enum Type {EMPTY, APPEND, COMMIT, MEMBERSHIP, SNAPSHOT, TERM, VOTE}
public static void main(String... args) throws IOException {
Journal journal = JournalBuilder.of(new File(args[0])).open();
long term = 0;
long index = 0;
long committed = 0;
List<String> membership = Collections.emptyList();
Optional<String> lastVotedFor = Optional.absent();
Type lastEntryType = Type.EMPTY;
for (Location loc : journal.redo()) {
byte[] rawEntry = journal.read(loc, Journal.ReadType.ASYNC);
JournalEntry entry = JournalEntry.parseFrom(rawEntry);
if (entry.hasAppend()) {
Append a = entry.getAppend();
index = a.getIndex();
term = a.getEntry().getTerm();
lastEntryType = Type.APPEND;
} else if (entry.hasCommit()) {
Commit c = entry.getCommit();
committed = c.getIndex();
lastEntryType = Type.COMMIT;
} else if (entry.hasMembership()) {
Membership m = entry.getMembership();
membership = m.getMembersList();
lastEntryType = Type.MEMBERSHIP;
} else if (entry.hasSnapshot()) {
Snapshot s = entry.getSnapshot();
index = s.getLastIncludedIndex();
term = s.getLastIncludedTerm();
lastEntryType = Type.SNAPSHOT;
} else if (entry.hasTerm()) {
Term t = entry.getTerm();
term = t.getTerm();
lastEntryType = Type.TERM;
} else if (entry.hasVote()) {
Vote v = entry.getVote();
lastVotedFor = Optional.fromNullable(v.getVotedFor());
lastEntryType = Type.VOTE;
System.out.println("Vote: " + lastVotedFor.orNull());
}
System.out.println(lastEntryType.toString() + " " + "term: " + term + ", index: " + index + ", committed: " + committed);
}
journal.close();
}
}