org.graylog.plugins.usagestatistics.UsageStatsNodeService Maven / Gradle / Ivy

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Plugin for collecting anonymous usage statistics of Graylog clusters and nodes

There is a newer version: 2.2.0-alpha.1

/**
 * Copyright (C) 2015 Graylog, Inc. ([email protected])
 *
 * 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 org.graylog.plugins.usagestatistics;

import com.github.joschi.jadconfig.util.Duration;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
import org.graylog.plugins.usagestatistics.collectors.NodeCollector;
import org.graylog.plugins.usagestatistics.dto.NodeDataSet;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;

@Singleton
public class UsageStatsNodeService {
    private final Supplier cachedDataSet;

    @Inject
    public UsageStatsNodeService(NodeCollector nodeCollector,
                                 @Named("usage_statistics_cache_timeout") Duration cacheTimeout) {
        this(supplier(nodeCollector), cacheTimeout);
    }

    @VisibleForTesting
    UsageStatsNodeService(Supplier nodeDataSetSupplier, Duration cacheTimeout) {
        this.cachedDataSet = Suppliers.memoizeWithExpiration(
                nodeDataSetSupplier,
                cacheTimeout.getQuantity(),
                cacheTimeout.getUnit());
    }

    private static Supplier supplier(final NodeCollector nodeCollector) {
        return new Supplier() {
            @Override
            public NodeDataSet get() {
                return nodeCollector.getNodeDataSet();
            }
        };
    }

    public NodeDataSet buildNodeDataSet() {
        return cachedDataSet.get();
    }

}