public void removeFriends(String from_uname, List<String> to_unames) {
Mutator<String> mutator = cassandra.getMutator();
for (String uname : to_unames) {
mutator
.addDeletion(from_uname, FRIENDS, uname, SE)
.addDeletion(uname, FOLLOWERS, from_uname, SE);
mutator.decrementCounter(from_uname, MISC_COUNTS, "friends", 1);
mutator.decrementCounter(uname, MISC_COUNTS, "followers", 1);
}
mutator.execute();
}
public void addFriends(String from_uname, List<String> to_unames) {
long timestamp = System.currentTimeMillis();
Mutator<String> mutator = cassandra.getMutator();
for (String uname : to_unames) {
mutator
.addInsertion(
from_uname, FRIENDS, HFactory.createStringColumn(uname, String.valueOf(timestamp)))
.addInsertion(
uname, FOLLOWERS, HFactory.createStringColumn(from_uname, String.valueOf(timestamp)))
.addCounter(from_uname, MISC_COUNTS, HFactory.createCounterColumn("friends", 1))
.addCounter(uname, MISC_COUNTS, HFactory.createCounterColumn("followers", 1));
}
mutator.execute();
}
public void saveTweet(Tweet tweet) {
long timestamp = System.currentTimeMillis();
String key = bToS(tweet.getKey());
Mutator<String> mutator = cassandra.getMutator();
mutator
.addInsertion(key, TWEETS, createStringColumn("uname", tweet.getUname()))
.addInsertion(key, TWEETS, createStringColumn("body", tweet.getBody()))
.addInsertion(key, TWEETS, createStringColumn("timestamp", String.valueOf(timestamp)))
.addInsertion(
tweet.getUname(), USERLINE, createStringColumn(String.valueOf(timestamp), key))
.addInsertion(PUBLIC, USERLINE, createStringColumn(String.valueOf(timestamp), key))
.addCounter(tweet.getUname(), MISC_COUNTS, HFactory.createCounterColumn("tweets", 1))
.addCounter(PUBLIC, MISC_COUNTS, HFactory.createCounterColumn("tweets", 1));
ArrayList<String> followerUnames = new ArrayList<String>(getFollowerUnames(tweet.getUname()));
for (String follower : followerUnames) {
mutator.addInsertion(follower, TIMELINE, createColumn(timestamp, key));
}
mutator.execute();
}