/** Create a populated tree, delete all records, then begin to insert again. */
private void setupWrittenByCompression(Database db) throws DatabaseException {
setStepwiseStart();
DatabaseEntry key = new DatabaseEntry();
DatabaseEntry data = new DatabaseEntry();
/* Populate a tree so it grows to 2 levels, with 2 BINs. */
for (int i = 0; i < 10; i++) {
IntegerBinding.intToEntry(i, key);
IntegerBinding.intToEntry(i, data);
assertEquals(OperationStatus.SUCCESS, db.put(null, key, data));
}
Trace.trace(DbInternal.getEnvironmentImpl(env), "After inserts");
env.checkpoint(FORCE_CONFIG);
if (DEBUG) {
System.out.println(db.getStats(new StatsConfig()));
}
/* Now delete all of 1 BIN. */
for (int i = 0; i < 5; i++) {
IntegerBinding.intToEntry(i, key);
assertEquals(OperationStatus.SUCCESS, db.delete(null, key));
}
/* Compress, removing a BIN. */
env.compress();
if (DEBUG) {
System.out.println("After compress");
System.out.println(db.getStats(new StatsConfig()));
}
/* Checkpoint again. */
env.checkpoint(FORCE_CONFIG);
}
/**
* Helper to get statistics for a given database.
*
* @param params operation parameters
* @return DatabaseStats object
*/
private DatabaseStats getDatabaseStats(Environment targetEnv, Object[] params)
throws IllegalArgumentException, DatabaseException {
if ((params == null) || (params.length < 3)) {
return null;
}
String dbName = (String) params[2];
Database db = null;
try {
DatabaseConfig dbConfig = new DatabaseConfig();
dbConfig.setReadOnly(true);
DbInternal.setUseExistingConfig(dbConfig, true);
db = targetEnv.openDatabase(null, dbName, dbConfig);
return db.getStats(getStatsConfig(params));
} finally {
if (db != null) {
db.close();
}
}
}