| /* |
| * 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.qpid.protonj2.engine.impl; |
| |
| import org.apache.qpid.protonj2.buffer.ProtonBuffer; |
| import org.apache.qpid.protonj2.buffer.ProtonByteBufferAllocator; |
| import org.apache.qpid.protonj2.buffer.ProtonByteUtils; |
| import org.apache.qpid.protonj2.engine.DeliveryTagGenerator; |
| import org.apache.qpid.protonj2.types.DeliveryTag; |
| |
| /** |
| * A Built in proton {@link DeliveryTagGenerator} that creates new tags using a sequential |
| * numeric value which is encoded using the most compact representation of the numeric value. |
| */ |
| public class ProtonSequentialTagGenerator extends ProtonDeliveryTagGenerator { |
| |
| protected long nextTagId = 0; |
| |
| @Override |
| public DeliveryTag nextTag() { |
| return new ProtonNumericDeliveryTag(nextTagId++); |
| } |
| |
| /* |
| * Test entry point to validate tag cache and tag counter overflow. |
| */ |
| void setNextTagId(long nextIdValue) { |
| this.nextTagId = nextIdValue; |
| } |
| |
| protected static class ProtonNumericDeliveryTag implements DeliveryTag { |
| |
| protected final long tagValue; |
| |
| public ProtonNumericDeliveryTag(long tagValue) { |
| this.tagValue = tagValue; |
| } |
| |
| @Override |
| public int tagLength() { |
| if (tagValue < 0) { |
| return Long.BYTES; |
| } else if (tagValue <= 0x00000000000000FFl) { |
| return Byte.BYTES; |
| } else if (tagValue <= 0x000000000000FFFFl) { |
| return Short.BYTES; |
| } else if (tagValue <= 0x00000000FFFFFFFFl) { |
| return Integer.BYTES; |
| } else { |
| return Long.BYTES; |
| } } |
| |
| @Override |
| public byte[] tagBytes() { |
| if (tagValue < 0) { |
| return ProtonByteUtils.toByteArray(tagValue); |
| } else if (tagValue <= 0x00000000000000FFl) { |
| return ProtonByteUtils.toByteArray((byte) tagValue); |
| } else if (tagValue <= 0x000000000000FFFFl) { |
| return ProtonByteUtils.toByteArray((short) tagValue); |
| } else if (tagValue <= 0x00000000FFFFFFFFl) { |
| return ProtonByteUtils.toByteArray((int) tagValue); |
| } else { |
| return ProtonByteUtils.toByteArray(tagValue); |
| } |
| } |
| |
| @Override |
| public ProtonBuffer tagBuffer() { |
| return ProtonByteBufferAllocator.DEFAULT.wrap(tagBytes()); |
| } |
| |
| @Override |
| public void release() { |
| // Nothing to do in this implementation |
| } |
| |
| @Override |
| public DeliveryTag copy() { |
| return new ProtonNumericDeliveryTag(tagValue); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Long.hashCode(tagValue); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj == null) { |
| return false; |
| } |
| if (getClass() != obj.getClass()) { |
| return false; |
| } |
| |
| ProtonNumericDeliveryTag other = (ProtonNumericDeliveryTag) obj; |
| if (tagValue != other.tagValue) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| @Override |
| public String toString() { |
| return "{" + tagValue + "}"; |
| } |
| |
| @Override |
| public void writeTo(ProtonBuffer buffer) { |
| if (tagValue < 0) { |
| buffer.writeLong(tagValue); |
| } else if (tagValue <= 0x00000000000000FFl) { |
| buffer.writeByte((int) tagValue); |
| } else if (tagValue <= 0x000000000000FFFFl) { |
| buffer.writeShort((short) tagValue); |
| } else if (tagValue <= 0x00000000FFFFFFFFl) { |
| buffer.writeInt((int) tagValue); |
| } else { |
| buffer.writeLong(tagValue); |
| } |
| } |
| } |
| } |