/**
* Creates connection objects and pushes it into queue.
*
* @param factory Used to create JDBConnection implementations.
* @param poolSize Number of JDBConnection implementations to create.
* @param leaseTimeInMillis How long the client can use the connection before it expires.
*/
public ConnectionPool(JdbConnectionFactory factory, int poolSize, long leaseTimeInMillis) {
for (int i = 0; i < poolSize; i++) {
pooled.addLast(factory.create());
}
this.factory = factory;
this.leaseTimeInMillis = leaseTimeInMillis;
}
private JdbConnection createReplacementIfExpiredConnFound() throws ConnectionPoolException {
// check for the first expired connection , close it and create a replacement
// throw exception if replacement is not possible
Entry<JdbConnection, Instant> entry =
borrowed
.entrySet()
.stream()
.filter(e -> hasExpired(e.getValue()))
.findFirst()
.orElseThrow(() -> new ConnectionPoolException("No connections available"));
entry.getKey().close();
borrowed.remove(entry.getKey());
JdbConnection newJdbConnection = factory.create();
borrowed.put(newJdbConnection, Instant.now());
return newJdbConnection;
}
