DefaultHostsFileEntriesResolver.java — netty Source File

Source Code

/*
 * Copyright 2015 The Netty Project
 *
 * The Netty Project 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:
 *
 *   https://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 io.netty.resolver;

import io.netty.util.CharsetUtil;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.SystemPropertyUtil;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;

import java.net.InetAddress;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.atomic.AtomicLong;

/**
 * Default {@link HostsFileEntriesResolver} that resolves hosts file entries only once.
 */
public final class DefaultHostsFileEntriesResolver implements HostsFileEntriesResolver {

    private static final InternalLogger logger =
            InternalLoggerFactory.getInstance(DefaultHostsFileEntriesResolver.class);
    private static final long DEFAULT_REFRESH_INTERVAL;

    private final long refreshInterval;
    private final AtomicLong lastRefresh = new AtomicLong(System.nanoTime());
    private final HostsFileEntriesProvider.Parser hostsFileParser;
    private volatile Map<String, List<InetAddress>> inet4Entries;
    private volatile Map<String, List<InetAddress>> inet6Entries;

    static {
        DEFAULT_REFRESH_INTERVAL = SystemPropertyUtil.getLong(
                "io.netty.hostsFileRefreshInterval", /*nanos*/0);

        if (logger.isDebugEnabled()) {
            logger.debug("-Dio.netty.hostsFileRefreshInterval: {}", DEFAULT_REFRESH_INTERVAL);
        }
    }

    public DefaultHostsFileEntriesResolver() {
        this(HostsFileEntriesProvider.parser(), DEFAULT_REFRESH_INTERVAL);
    }

// ... (89 more lines)