modules/core/src/main/java/org/apache/ignite/internal/cluster/DistributedConfigurationUtils.java

/*
 * 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 org.apache.ignite.internal.cluster;

import java.io.Serializable;
import java.util.Objects;
import org.apache.ignite.IgniteCheckedException;
import org.apache.ignite.IgniteLogger;
import org.apache.ignite.internal.IgniteInternalFuture;
import org.apache.ignite.internal.processors.configuration.distributed.DistributePropertyListener;
import org.apache.ignite.internal.processors.configuration.distributed.DistributedProperty;
import org.apache.ignite.lang.IgniteInClosure;
import org.jetbrains.annotations.NotNull;

import static java.lang.String.format;

/**
 * Distributed configuration utilities methods.
 */
public final class DistributedConfigurationUtils {
    /**
     */
    private DistributedConfigurationUtils() {
        // No-op.
    }

    /**
     * @param property Property which value should be set.
     * @param value Default value.
     * @param log Logger.
     * @param <T> Property type.
     */
    public static <T extends Serializable> void setDefaultValue(DistributedProperty<T> property, T value, IgniteLogger log) {
        if (property.get() == null) {
            try {
                property.propagateAsync(null, value)
                    .listen((IgniteInClosure<IgniteInternalFuture<?>>)future -> {
                        if (future.error() != null)
                            log.error("Cannot set default value of '" + property.getName() + '\'', future.error());
                    });
            }
            catch (IgniteCheckedException e) {
                log.error("Cannot initiate setting default value of '" + property.getName() + '\'', e);
            }
        }
    }

    /**
     * @param propUpdMsg Update message.
     * @param log Logger.
     * @param <T> Type of property value.
     * @return Update property listener.
     */
    @NotNull public static <T> DistributePropertyListener<T> makeUpdateListener(String propUpdMsg, IgniteLogger log) {
        return (name, oldVal, newVal) -> {
            if (!Objects.equals(oldVal, newVal)) {
                if (log.isInfoEnabled())
                    log.info(format(propUpdMsg, name, oldVal, newVal));
            }
        };
    }
}