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c458c05801
The dark lord Gosling designed the Java package naming system so that ownership flows from the DNS system. Since we own the domain name registry.google, it seems only appropriate that we should use google.registry as our package name.
70 lines
2.2 KiB
Java
70 lines
2.2 KiB
Java
// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.server;
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import com.google.common.base.Throwables;
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import com.google.common.util.concurrent.SimpleTimeLimiter;
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import java.io.IOException;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import java.util.concurrent.Callable;
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import java.util.concurrent.TimeUnit;
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import javax.annotation.Nullable;
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final class UrlChecker {
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private static final int READ_TIMEOUT_MS = 1000;
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private static final int CONNECT_TIMEOUT_MS = 500;
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/** Probes {@code url} until it becomes available. */
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static void waitUntilAvailable(final URL url, int timeoutMs) {
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try {
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new SimpleTimeLimiter().callWithTimeout(new Callable<Void>() {
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@Nullable
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@Override
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public Void call() throws InterruptedException, IOException {
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int exponentialBackoffMs = 1;
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while (true) {
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if (isAvailable(url)) {
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return null;
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}
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Thread.sleep(exponentialBackoffMs *= 2);
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}
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}
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}, timeoutMs, TimeUnit.MILLISECONDS, true);
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} catch (Exception e) {
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throw Throwables.propagate(e);
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}
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}
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/** Returns {@code true} if page is available and returns {@code 200 OK}. */
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static boolean isAvailable(URL url) throws IOException {
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HttpURLConnection connection = (HttpURLConnection) url.openConnection();
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connection.setConnectTimeout(CONNECT_TIMEOUT_MS);
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connection.setReadTimeout(READ_TIMEOUT_MS);
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try {
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connection.connect();
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return connection.getResponseCode() == HttpURLConnection.HTTP_OK;
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} catch (IOException e) {
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return false;
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} finally {
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connection.disconnect();
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}
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}
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private UrlChecker() {}
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}
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