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Apache ZooKeeper Server Source Code
Apache ZooKeeper is an open-source server which enables highly reliable distributed coordination.
Apache ZooKeeper Server Source Code files are provided in the source package file, apache-zookeeper-3.8.0.tar.gz.
You can download apache-zookeeper-3.8.0.tar.gz as described in the previous tutorial and go to the "zookeeper-server" sub-folder to view Apache ZooKeeper Server Source Code files.
You can also browse Apache ZooKeeper Server Source Code below:
✍: FYIcenter.com
⏎ org/apache/zookeeper/server/util/CircularBuffer.java
/** * 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 * <p> * http://www.apache.org/licenses/LICENSE-2.0 * <p> * 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.zookeeper.server.util; import java.lang.reflect.Array; import java.util.concurrent.atomic.AtomicInteger; /** * Thread safe FIFO CircularBuffer implementation. * When the buffer is full write operation overwrites the oldest element. * * Fun thing @todo, make this lock free as this is called on every quorum message */ public class CircularBuffer<T> { private final T[] buffer; private final int capacity; private int oldest; private AtomicInteger numberOfElements = new AtomicInteger(); @SuppressWarnings("unchecked") public CircularBuffer(Class<T> clazz, int capacity) { if (capacity <= 0) { throw new IllegalArgumentException("CircularBuffer capacity should be greater than 0"); } this.buffer = (T[]) Array.newInstance(clazz, capacity); this.capacity = capacity; } /** * Puts elements in the next available index in the array. * If the array is full the oldest element is replaced with * the new value. * @param element */ public synchronized void write(T element) { int newSize = numberOfElements.incrementAndGet(); if (newSize > capacity) { buffer[oldest] = element; oldest = ++oldest % capacity; numberOfElements.decrementAndGet(); } else { int index = (oldest + numberOfElements.get() - 1) % capacity; buffer[index] = element; } } /** * Reads from the buffer in a FIFO manner. * Returns the oldest element in the buffer if the buffer is not empty * Returns null if the buffer is empty * @return the oldest element in the buffer */ public synchronized T take() { int newSize = numberOfElements.decrementAndGet(); if (newSize < 0) { numberOfElements.incrementAndGet(); return null; } T polled = buffer[oldest]; oldest = ++oldest % capacity; return polled; } public synchronized T peek() { if (numberOfElements.get() <= 0) { return null; } return buffer[oldest]; } public int size() { return numberOfElements.get(); } public boolean isEmpty() { return numberOfElements.get() <= 0; } public boolean isFull() { return numberOfElements.get() >= capacity; } public synchronized void reset() { numberOfElements.set(0); } }
⏎ org/apache/zookeeper/server/util/CircularBuffer.java
Or download all of them as a single archive file:
File name: zookeeper-server-3.8.0-fyi.zip File size: 885581 bytes Release date: 2022-02-25 Download
⇒ Apache ZooKeeper Jute Source Code
⇐ Download and Install Apache ZooKeeper Source Package
2022-11-16, 13660👍, 0💬
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