com.datastax.oss.driver.internal.core.connection.ConstantReconnectionPolicy Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 {@code advanced.reconnection-policy} section in the driver
* configuration, for example:
*
*
* datastax-java-driver {
* advanced.reconnection-policy {
* class = ConstantReconnectionPolicy
* base-delay = 1 second
* }
* }
*
*
* 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. */
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
}
}