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*
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package oracle.kv.table;
import java.util.concurrent.TimeUnit;
import oracle.kv.Consistency;
import oracle.kv.KVStoreConfig;
/**
* ReadOptions is passed to read-only store operations to specify arguments that
* control non-default behavior related to consistency and operation timeouts.
*
* The default behavior is configured when a store is opened using
* {@link KVStoreConfig}.
*
* @since 3.0
*/
public class ReadOptions {
private final Consistency consistency;
private final long timeout;
private final TimeUnit timeoutUnit;
/**
* Creates a {@code ReadOptions} with the specified parameters.
*
* If {@code consistency} is {@code null}, the
* {@link KVStoreConfig#getConsistency default consistency}
* is used.
*
* If {@code timeout} is zero the
* {@link KVStoreConfig#getRequestTimeout default request timeout} is used.
*
* The {@code timeout} parameter is an upper bound on the time interval for
* processing the operation. A best effort is made not to exceed the
* specified limit. If zero, the {@link KVStoreConfig#getRequestTimeout
* default request timeout} is used.
*
* If {@code timeout} is not 0, the {@code timeoutUnit} parameter must not
* be {@code null}.
*
* @param consistency the read consistency to use or null
* @param timeout the timeout value to use
* @param timeoutUnit the {@link TimeUnit} used by the
* timeout parameter or null
*
* @throws IllegalArgumentException if timeout is negative
* @throws IllegalArgumentException if timeout is > 0 and timeoutUnit
* is null
*/
public ReadOptions(Consistency consistency,
long timeout,
TimeUnit timeoutUnit) {
if (timeout < 0) {
throw new IllegalArgumentException("timeout must be >= 0");
}
if ((timeout != 0) && (timeoutUnit == null)) {
throw new IllegalArgumentException("A non-zero timeout requires " +
"a non-null timeout unit");
}
this.consistency = consistency;
this.timeout = timeout;
this.timeoutUnit = timeoutUnit;
}
/**
* Gets the consistency used for a read operation.
* If null, the {@link KVStoreConfig#getConsistency default consistency}
* is used.
*
* @return the consistency used for a read operation
*/
public Consistency getConsistency() {
return consistency;
}
/**
* Gets the timeout, which is an upper bound on the time interval for
* processing the operation. A best effort is made not to exceed the
* specified limit. If zero, the {@link KVStoreConfig#getRequestTimeout
* default request timeout} is used.
*
* @return the timeout
*/
public long getTimeout() {
return timeout;
}
/**
* Gets the unit of the timeout parameter, and may
* be {@code null} only if {@link #getTimeout} returns zero.
*
* @return the timeout unit or null
*/
public TimeUnit getTimeoutUnit() {
return timeoutUnit;
}
}