public int init(RepConfig config) throws DatabaseException {
int ret = 0;
appConfig = config;
EnvironmentConfig envConfig = new EnvironmentConfig();
envConfig.setErrorStream(System.err);
envConfig.setErrorPrefix(RepConfig.progname);
envConfig.setReplicationManagerLocalSite(appConfig.getThisHost());
for (RepRemoteHost host = appConfig.getFirstOtherHost();
host != null;
host = appConfig.getNextOtherHost()) {
envConfig.replicationManagerAddRemoteSite(host.getAddress(), host.isPeer());
}
if (appConfig.totalSites > 0) envConfig.setReplicationNumSites(appConfig.totalSites);
/*
* Set replication group election priority for this environment.
* An election first selects the site with the most recent log
* records as the new master. If multiple sites have the most
* recent log records, the site with the highest priority value
* is selected as master.
*/
envConfig.setReplicationPriority(appConfig.priority);
envConfig.setCacheSize(RepConfig.CACHESIZE);
envConfig.setTxnNoSync(true);
envConfig.setEventHandler(new RepQuoteEventHandler());
/*
* Set the policy that determines how master and client sites
* handle acknowledgement of replication messages needed for
* permanent records. The default policy of "quorum" requires only
* a quorum of electable peers sufficient to ensure a permanent
* record remains durable if an election is held. The "all" option
* requires all clients to acknowledge a permanent replication
* message instead.
*/
envConfig.setReplicationManagerAckPolicy(appConfig.ackPolicy);
/*
* Set the threshold for the minimum and maximum time the client
* waits before requesting retransmission of a missing message.
* Base these values on the performance and load characteristics
* of the master and client host platforms as well as the round
* trip message time.
*/
envConfig.setReplicationRequestMin(20000);
envConfig.setReplicationRequestMax(500000);
/*
* Configure deadlock detection to ensure that any deadlocks
* are broken by having one of the conflicting lock requests
* rejected. DB_LOCK_DEFAULT uses the lock policy specified
* at environment creation time or DB_LOCK_RANDOM if none was
* specified.
*/
envConfig.setLockDetectMode(LockDetectMode.DEFAULT);
envConfig.setAllowCreate(true);
envConfig.setRunRecovery(true);
envConfig.setThreaded(true);
envConfig.setInitializeReplication(true);
envConfig.setInitializeLocking(true);
envConfig.setInitializeLogging(true);
envConfig.setInitializeCache(true);
envConfig.setTransactional(true);
envConfig.setVerboseReplication(appConfig.verbose);
try {
dbenv = new RepQuoteEnvironment(appConfig.getHome(), envConfig);
} catch (FileNotFoundException e) {
System.err.println("FileNotFound exception: " + e);
System.err.println("Ensure that the environment directory is pre-created.");
ret = 1;
}
if (appConfig.bulk) dbenv.setReplicationConfig(ReplicationConfig.BULK, true);
/*
* Configure heartbeat timeouts so that repmgr monitors the
* health of the TCP connection. Master sites broadcast a heartbeat
* at the frequency specified by the DB_REP_HEARTBEAT_SEND timeout.
* Client sites wait for message activity the length of the
* DB_REP_HEARTBEAT_MONITOR timeout before concluding that the
* connection to the master is lost. The DB_REP_HEARTBEAT_MONITOR
* timeout should be longer than the DB_REP_HEARTBEAT_SEND timeout.
*/
dbenv.setReplicationTimeout(ReplicationTimeoutType.HEARTBEAT_SEND, 5000000);
dbenv.setReplicationTimeout(ReplicationTimeoutType.HEARTBEAT_MONITOR, 10000000);
/* The following base replication features may also be useful to your
* application. See Berkeley DB documentation for more details.
* - Master leases: Provide stricter consistency for data reads
* on a master site.
* - Timeouts: Customize the amount of time Berkeley DB waits
* for such things as an election to be concluded or a master
* lease to be granted.
* - Delayed client synchronization: Manage the master site's
* resources by spreading out resource-intensive client
* synchronizations.
* - Blocked client operations: Return immediately with an error
* instead of waiting indefinitely if a client operation is
* blocked by an ongoing client synchronization.
*
* The following repmgr features may also be useful to your
* application. See Berkeley DB documentation for more details.
* - Two-site strict majority rule - In a two-site replication
* group, require both sites to be available to elect a new
* master.
* - Timeouts - Customize the amount of time repmgr waits
* for such things as waiting for acknowledgements or attempting
* to reconnect to other sites.
* - Site list - return a list of sites currently known to repmgr.
*/
/* Start checkpoint and log archive support threads. */
ckpThr = new CheckpointThread(dbenv);
ckpThr.start();
lgaThr = new LogArchiveThread(dbenv, envConfig);
lgaThr.start();
/* Start replication manager. */
dbenv.replicationManagerStart(3, appConfig.startPolicy);
return ret;
}
public static void main(String[] argv) throws Exception {
RepConfig config = new RepConfig();
boolean isPeer;
String tmpHost;
int tmpPort = 0;
/* Extract the command line parameters. */
for (int i = 0; i < argv.length; i++) {
isPeer = false;
if (argv[i].compareTo("-a") == 0) {
if (i == argv.length - 1) usage();
i++;
if (argv[i].equals("all")) config.ackPolicy = ReplicationManagerAckPolicy.ALL;
else if (!argv[i].equals("quorum")) usage();
} else if (argv[i].compareTo("-b") == 0) config.bulk = true;
else if (argv[i].compareTo("-C") == 0) {
config.startPolicy = ReplicationManagerStartPolicy.REP_CLIENT;
} else if (argv[i].compareTo("-h") == 0) {
if (i == argv.length - 1) usage();
/* home - a string arg. */
i++;
config.home = argv[i];
} else if (argv[i].compareTo("-l") == 0) {
if (i == argv.length - 1) usage();
/* "local" should be host:port. */
i++;
String[] words = argv[i].split(":");
if (words.length != 2) {
System.err.println("Invalid host specification host:port needed.");
usage();
}
try {
tmpPort = Integer.parseInt(words[1]);
} catch (NumberFormatException nfe) {
System.err.println("Invalid host specification, " + "could not parse port number.");
usage();
}
config.setThisHost(words[0], tmpPort);
} else if (argv[i].compareTo("-M") == 0) {
config.startPolicy = ReplicationManagerStartPolicy.REP_MASTER;
} else if (argv[i].compareTo("-n") == 0) {
if (i == argv.length - 1) usage();
i++;
config.totalSites = Integer.parseInt(argv[i]);
} else if (argv[i].compareTo("-p") == 0) {
if (i == argv.length - 1) usage();
i++;
config.priority = Integer.parseInt(argv[i]);
} else if (argv[i].compareTo("-R") == 0 || argv[i].compareTo("-r") == 0) {
if (i == argv.length - 1) usage();
if (argv[i].equals("-R")) isPeer = true;
i++;
String[] words = argv[i].split(":");
if (words.length != 2) {
System.err.println("Invalid host specification host:port needed.");
usage();
}
try {
tmpPort = Integer.parseInt(words[1]);
} catch (NumberFormatException nfe) {
System.err.println("Invalid host specification, " + "could not parse port number.");
usage();
}
config.addOtherHost(words[0], tmpPort, isPeer);
} else if (argv[i].compareTo("-v") == 0) {
config.verbose = true;
} else {
System.err.println("Unrecognized option: " + argv[i]);
usage();
}
}
/* Error check command line. */
if ((!config.gotListenAddress()) || config.home.length() == 0) usage();
RepQuoteExample runner = null;
try {
runner = new RepQuoteExample();
runner.init(config);
/* Sleep to give ourselves time to find a master. */
// try {
// Thread.sleep(5000);
// } catch (InterruptedException e) {}
runner.doloop();
runner.terminate();
} catch (DatabaseException dbe) {
System.err.println("Caught an exception during " + "initialization or processing: " + dbe);
if (runner != null) runner.terminate();
}
} /* End main. */