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/*
 * 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 {@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 } }




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