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50 lines
1.9 KiB
Java
50 lines
1.9 KiB
Java
// Copyright 2017 The Nomulus 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.flows;
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import static com.google.common.primitives.Longs.BYTES;
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import com.google.common.io.BaseEncoding;
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import java.nio.ByteBuffer;
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import java.util.UUID;
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import java.util.concurrent.atomic.AtomicLong;
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import javax.inject.Inject;
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/** A server Trid provider that generates globally incrementing UUIDs. */
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public class ServerTridProviderImpl implements ServerTridProvider {
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private static final String SERVER_ID = getServerId();
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private static final AtomicLong idCounter = new AtomicLong();
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@Inject public ServerTridProviderImpl() {}
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/** Creates a unique id for this server instance, as a base64 encoded UUID. */
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private static String getServerId() {
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UUID uuid = UUID.randomUUID();
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ByteBuffer buffer =
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ByteBuffer.allocate(BYTES * 2)
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.putLong(uuid.getMostSignificantBits())
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.putLong(uuid.getLeastSignificantBits());
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return BaseEncoding.base64().encode(buffer.array());
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}
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@Override
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public String createServerTrid() {
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// The server id can be at most 64 characters. The SERVER_ID is at most 22 characters (128
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// bits in base64), plus the dash. That leaves 41 characters, so we just append the counter in
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// hex.
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return String.format("%s-%x", SERVER_ID, idCounter.incrementAndGet());
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}
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}
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