/*
* Copyright DataStax, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.datastax.oss.driver.internal.core.connection;
import com.datastax.oss.driver.api.core.config.DefaultDriverOption;
import com.datastax.oss.driver.api.core.config.DriverExecutionProfile;
import com.datastax.oss.driver.api.core.connection.ReconnectionPolicy;
import com.datastax.oss.driver.api.core.context.DriverContext;
import com.datastax.oss.driver.api.core.metadata.Node;
import edu.umd.cs.findbugs.annotations.NonNull;
import java.time.Duration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
A reconnection policy that waits a constant time between each reconnection attempt.
To activate this policy, modify the advanced.reconnection-policy
section in the driver configuration, for example:
datastax-java-driver {
advanced.reconnection-policy {
class = ConstantReconnectionPolicy
base-delay = 1 second
}
}
See reference.conf
(in the manual or core driver JAR) for more details. /**
* A reconnection policy that waits a constant time between each reconnection attempt.
*
* <p>To activate this policy, modify the {@code advanced.reconnection-policy} section in the driver
* configuration, for example:
*
* <pre>
* datastax-java-driver {
* advanced.reconnection-policy {
* class = ConstantReconnectionPolicy
* base-delay = 1 second
* }
* }
* </pre>
*
* See {@code reference.conf} (in the manual or core driver JAR) for more details.
*/
public class ConstantReconnectionPolicy implements ReconnectionPolicy {
private static final Logger LOG = LoggerFactory.getLogger(ConstantReconnectionPolicy.class);
private final String logPrefix;
private final ReconnectionSchedule schedule;
Builds a new instance. /** Builds a new instance. */
public ConstantReconnectionPolicy(DriverContext context) {
this.logPrefix = context.getSessionName();
DriverExecutionProfile config = context.getConfig().getDefaultProfile();
Duration delay = config.getDuration(DefaultDriverOption.RECONNECTION_BASE_DELAY);
if (delay.isNegative()) {
throw new IllegalArgumentException(
String.format(
"Invalid negative delay for "
+ DefaultDriverOption.RECONNECTION_BASE_DELAY.getPath()
+ " (got %d)",
delay));
}
this.schedule = () -> delay;
}
@NonNull
@Override
public ReconnectionSchedule newNodeSchedule(@NonNull Node node) {
LOG.debug("[{}] Creating new schedule for {}", logPrefix, node);
return schedule;
}
@NonNull
@Override
public ReconnectionSchedule newControlConnectionSchedule(
@SuppressWarnings("ignored") boolean isInitialConnection) {
LOG.debug("[{}] Creating new schedule for the control connection", logPrefix);
return schedule;
}
@Override
public void close() {
// nothing to do
}
}