public void merge() throws Exception {
LOG.info("start merge");
Database crawldbDatabase = env.openDatabase(null, "crawldb", BerkeleyDBUtils.defaultDBConfig);
/*合并fetch库*/
LOG.info("merge fetch database");
Database fetchDatabase = env.openDatabase(null, "fetch", BerkeleyDBUtils.defaultDBConfig);
Cursor fetchCursor = fetchDatabase.openCursor(null, null);
DatabaseEntry key = new DatabaseEntry();
DatabaseEntry value = new DatabaseEntry();
while (fetchCursor.getNext(key, value, LockMode.DEFAULT) == OperationStatus.SUCCESS) {
crawldbDatabase.put(null, key, value);
}
fetchCursor.close();
fetchDatabase.close();
/*合并link库*/
LOG.info("merge link database");
Database linkDatabase = env.openDatabase(null, "link", BerkeleyDBUtils.defaultDBConfig);
Cursor linkCursor = linkDatabase.openCursor(null, null);
while (linkCursor.getNext(key, value, LockMode.DEFAULT) == OperationStatus.SUCCESS) {
if (!(crawldbDatabase.get(null, key, value, LockMode.DEFAULT) == OperationStatus.SUCCESS)) {
crawldbDatabase.put(null, key, value);
}
}
linkCursor.close();
linkDatabase.close();
LOG.info("end merge");
crawldbDatabase.sync();
crawldbDatabase.close();
env.removeDatabase(null, "fetch");
LOG.debug("remove fetch database");
env.removeDatabase(null, "link");
LOG.debug("remove link database");
}
public void remove(String csName) {
try {
m_env.removeDatabase(null, csName);
} catch (DatabaseException e) {
e.printStackTrace();
}
m_env = null;
}
@Test
public void testCleanAfterDbRemoval() {
open(true /*runCleaner*/);
writeFiles(5 /*nActive*/, 0 /*nObsolete*/);
expectNothingToClean();
db.close();
db = null;
env.removeDatabase(null, DB_NAME);
expectBackgroundCleaning();
close();
}
public void remove(String dbName) {
env.removeDatabase(null, dbName);
}
/** removes database */
public void removeDatabase() {
final Transaction txn = myEnv.beginTransaction(null, null);
// close();
myEnv.removeDatabase(txn, dbName);
txn.commit();
}