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<h6 id="java-内存管理笔记"><a href="#java-内存管理笔记" class="headerlink" title="java 内存管理笔记 "></a>java 内存管理笔记 </h6><ul>
<li>Garbage Collection Concepts</li>
<li>Garbage Collectors</li>
<li>Ergonomics</li>
<li>Recommendations</li>
<li>Tools to Evaluate Garbage Collection Performance </li>
</ul>
<h6 id="Garbage-Collection-Concepts"><a href="#Garbage-Collection-Concepts" class="headerlink" title="Garbage Collection Concepts"></a>Garbage Collection Concepts</h6><p>垃圾回收器职责:</p>
<ul>
<li>allocating memory</li>
<li>ensuring that the referenced objects remain in memory</li>
<li>recovering memory used by objects that are no longer reacheable from references in executing code</li>
</ul>
<p>一个对象能够被引用，就认为是存活的，否则，则被认为是死的，会被当作垃圾回收。</p>
<p>垃圾回收算法面临２个难题：</p>
<ul>
<li>避免内存碎片化 </li>
<li>保持内存的申请和释放的效率 <br>设计选择：</li>
<li>串行或者并行 </li>
<li>并发 VS 暂停所有(stop-the-world)</li>
<li>拷贝时是否要压缩 </li>
</ul>
<h5 id="性能："><a href="#性能：" class="headerlink" title="性能："></a>性能：</h5><ul>
<li>Throughput</li>
<li>Garbage collection overhead</li>
<li>Ｐause time</li>
<li>Frequency of Collection</li>
<li>Footprint</li>
<li>Promptness</li>
</ul>
<h5 id="Generational-Collection-分代收集"><a href="#Generational-Collection-分代收集" class="headerlink" title="Generational Collection -分代收集 "></a>Generational Collection -分代收集 </h5><p>１. Yong generation</p>
<blockquote>
<p> 年轻代更注重与效率</p>
</blockquote>
<p>２. Old Generation</p>
<blockquote>
<p>老年代更注重与内存效率 </p>
</blockquote>
<h5 id="HotSpot-垃圾收集器"><a href="#HotSpot-垃圾收集器" class="headerlink" title="HotSpot 垃圾收集器 "></a>HotSpot 垃圾收集器 </h5><p>１. Generations</p>
<ol>
<li>yong</li>
<li>old</li>
<li>permanent<br>大多数对象在年轻代中初始化生成。 当对象在年轻代中经过一定次数的收集后仍然存活，则会被转入老年代，一些比较大的对象会直接在老年代中存活；classes ,methods 会存活在永久代中。</li>
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<h4 id="ZooKeeper"><a href="#ZooKeeper" class="headerlink" title="ZooKeeper"></a>ZooKeeper</h4><blockquote>
<p>wait-free coordination for Internet-scale systems</p>
<ul>
<li>elements from group messageing</li>
<li>shared registers</li>
<li>distributed lock services in replicated</li>
<li>centralized service</li>
</ul>
</blockquote>
<h4 id="Cores-of-zooKeeper"><a href="#Cores-of-zooKeeper" class="headerlink" title="Cores of zooKeeper"></a>Cores of zooKeeper</h4><ul>
<li>Coordination kernel</li>
<li>Coordination recipes</li>
<li>Experience with Coordination</li>
</ul>
<p>A distributed system is a computing system in which a number components cooperate by communicating over a network.<br>Compnents:</p>
<ul>
<li>object computing middleware</li>
<li>component middleware</li>
<li>publish/subscribe</li>
<li>message-oriented middleware</li>
<li>web services</li>
</ul>
<h4 id="Key-principles-that-influence-the-design-of-large-scale-Systems"><a href="#Key-principles-that-influence-the-design-of-large-scale-Systems" class="headerlink" title="Key principles that influence the design of large-scale Systems"></a>Key principles that influence the design of large-scale Systems</h4><ul>
<li>Avaliability</li>
<li>Performance</li>
<li>Reliability</li>
<li>Scalability</li>
<li>Manageability</li>
<li>Cost </li>
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proactor笔记
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<h4 id="Proactor"><a href="#Proactor" class="headerlink" title="Proactor"></a>Proactor</h4><blockquote>
<p>An object behavioral pattern for demultiplexing and dispatching handlers for Asynchronous Events </p>
</blockquote>
<h5 id="develope-high-performance-web-servers-requires-the-resolution-of-the-following-forces"><a href="#develope-high-performance-web-servers-requires-the-resolution-of-the-following-forces" class="headerlink" title="develope high-performance web servers requires the resolution of the following forces:"></a>develope high-performance web servers requires the resolution of the following forces:</h5><ul>
<li>Concurrency </li>
<li>Efficiency </li>
<li>Programming simplicity </li>
<li>Adaptablity </li>
</ul>
<p>Concurrency strtegies :</p>
<ol>
<li>Multiple synchronouns threads</li>
<li>reactive synchronous event dispatching </li>
<li>proactive asynchronous event dispatching </li>
</ol>
<h4 id="Drawbacks"><a href="#Drawbacks" class="headerlink" title="Drawbacks"></a>Drawbacks</h4><ol>
<li>Multiple Synchronous Threads <ul>
<li>Operation will blocks until it completes </li>
<li>simplification of application code </li>
<li>Threading policy is tightly coupled to the concurrency policy</li>
<li>Increased synchronization complexity</li>
<li>Increased performance overhead - context switching ,synchronization ,and data movement among CPUS</li>
<li>Non-portability</li>
</ul>
</li>
<li>Reactive Synchronous Event Dispatching </li>
</ol>
<h5 id="Steps"><a href="#Steps" class="headerlink" title="Steps"></a>Steps</h5><ol>
<li>Registers an Acceptor with Initiation Dispathcer</li>
<li>Web Server invokes Event Loop of the Initiation Dispatcher</li>
<li>Acllient connect to the Web Server</li>
<li>The Acceptor is notified by the Initiation Dispatcher of the new connection request and the Acceptor accpts the new connection</li>
<li>The Acceptor creates an Http Handler to service the new client</li>
<li>Http Handler register the connection with the Initiation Dispatcher for reading client request data </li>
<li>The Http Handler service the request from the new client </li>
</ol>
<p>for reading :</p>
<ol>
<li>The client sends an Http Get request </li>
<li>The Initiation Dispatcher notifies the Http Handler when client request data arrives at the server </li>
<li>The request is read in a non-blocking manner such that the read operation returns EWOUBLOCK if the operation woulod case the calling thread to block </li>
<li>The Http Handler the Http request</li>
<li>The requested file is synchronoously read from the file system </li>
<li>The Http Handler registers the connection with the Initiation Dispatcher for sending file data </li>
<li>The Initiation Dispatcher notifies the Http Handler when the Tcp connection is read for writing</li>
<li>The Http Handler sends the request file to the client client in a non-blocing manner such that the write operation returns EWOULDBLOCK if the operation would cause the calling thread to block<h6 id="drawbacks"><a href="#drawbacks" class="headerlink" title="drawbacks"></a>drawbacks</h6></li>
<li>complexing proramming </li>
<li>lack of OS support for multi-threading</li>
<li>scheduling of runnable tasks - reactive 是单线程，所以reactive 需要负责任务的调度，避免长时间的阻塞。 </li>
</ol>
<p>当ＯＳ支持异步操作时，proactor 模式会比较高效。</p>
<h5 id="Poractor-for-web-Server"><a href="#Poractor-for-web-Server" class="headerlink" title="Poractor for web Server"></a>Poractor for web Server</h5><ol>
<li>the web sever instructs the Acceptor to initiate an asynchronous accept</li>
<li>the Acceptor initiates an asynchronous accept with the OS and passes itself as a Completion Handler and a reference to the Completion Dispatcher that will be used to notify the Acceptor upon completion of the asynchronous accept</li>
<li>WS invokes the event loop of the Completion Dispatcher</li>
<li>client connect to the WS</li>
<li>when the asynchronous accept the operation completes ,the OS notifies the Completion Dispatcher</li>
<li>the Completion Dispatcher notifies the Acceptor </li>
<li>the Acceptor create an Http Handler</li>
<li>the Http Handler initiates an asynchronous operation to read the request data from the client and passes itself as a Completion Handler and a reference to the Completion Dispatcher that will be used to notify the Http Handler upon completion of the asynchronous read</li>
</ol>
<p>for read request:</p>
<ol>
<li>client send GET request to WS</li>
<li>after the reading completing ,the OS notified the Completed Dispatcher</li>
<li>Completion Dispatcher notifies the Http Handler</li>
<li>Http Handler parse the request</li>
<li>Http Handler synchronously read the requested file</li>
<li>Http Handler initiates an asyncrhonous operation to write the file data to the client connection and passes itself as a Completion Handler and a reference to the Completion Dispatcher that will be used to notify the Http Handler upon completion of the asynchronous write</li>
<li>when write operation completes ,the OS nofifies the Completion Dispatcher</li>
<li>the Completion Dispatcher notify the Http HAndler</li>
</ol>
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<h5 id="Happens-before-ordering"><a href="#Happens-before-ordering" class="headerlink" title="Happens-before ordering"></a>Happens-before ordering</h5><ol>
<li>Synchronized method and blocks</li>
<li>volatile fields </li>
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<h4 id="Synchronization-is-needed-for-blocking-and-visibility"><a href="#Synchronization-is-needed-for-blocking-and-visibility" class="headerlink" title="Synchronization is needed for blocking and visibility"></a>Synchronization is needed for blocking and visibility</h4>
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<h3 id="Netty"><a href="#Netty" class="headerlink" title="Netty"></a>Netty</h3><ul>
<li>Transport Service</li>
<li>Protocol Support </li>
<li>Core </li>
</ul>
<h5 id="core"><a href="#core" class="headerlink" title="core"></a>core</h5><ul>
<li>Extensible Event Model </li>
<li>Universal Communication API </li>
<li>Zero-Copy-Capable Rich Byte Buffer </li>
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<h4 id="Overview"><a href="#Overview" class="headerlink" title="Overview"></a>Overview</h4><ul>
<li>Asynchronous</li>
<li>Unified API </li>
<li>High-Performance </li>
<li>Buffer Pooling </li>
<li>Gathering/Scattering </li>
</ul>
<h4 id="why-not-non-blocking-at-all"><a href="#why-not-non-blocking-at-all" class="headerlink" title="why not non-blocking at all"></a>why not non-blocking at all</h4><p>a thread takes memory from 256kb to 1mb for the stack space </p>
<h4 id="bytebuffer"><a href="#bytebuffer" class="headerlink" title="bytebuffer"></a>bytebuffer</h4><h4 id="ChannelHandler-where-your-handling-logic-lifes"><a href="#ChannelHandler-where-your-handling-logic-lifes" class="headerlink" title="ChannelHandler -where your handling logic lifes"></a>ChannelHandler -where your handling logic lifes</h4><ul>
<li>inbound and outbound</li>
<li>called by the eventExecutor </li>
</ul>
<h6 id="channelInboundHandler"><a href="#channelInboundHandler" class="headerlink" title="channelInboundHandler"></a>channelInboundHandler</h6><ul>
<li>bind</li>
<li>connect</li>
<li>disconnect</li>
<li>close</li>
<li>deregister</li>
<li>read</li>
<li>write</li>
<li>flush</li>
</ul>
<h4 id="calling-method-directly-vs-fire-event-objects"><a href="#calling-method-directly-vs-fire-event-objects" class="headerlink" title="calling method directly vs. fire event objects"></a>calling method directly vs. fire event objects</h4><ul>
<li>NAN</li>
</ul>
<h3 id="provided-Encoder-Decoder"><a href="#provided-Encoder-Decoder" class="headerlink" title="provided Encoder /Decoder"></a>provided Encoder /Decoder</h3><ul>
<li>HTTP/HTTP2 </li>
<li>WebSockets </li>
<li>SPDY </li>
<li>SSL/TLS </li>
<li>Serialization </li>
<li>GZip/Deflate </li>
</ul>
<h4 id="Decoder-base-class-gt-inBound"><a href="#Decoder-base-class-gt-inBound" class="headerlink" title="Decoder base class ==>inBound"></a>Decoder base class ==>inBound</h4><ul>
<li>ByteToMessageDecoder</li>
<li>MessageToMEssageDecoder<br>Generic userfule Decoders</li>
</ul>
<ol>
<li>ReplayDecoder </li>
<li>FixedLengthFrameDecoder</li>
<li>LengthFieldBasedFrameDecoder</li>
<li>LineBaseFrameDecoder</li>
<li>DelimiterBasedFrameDecoder</li>
</ol>
<h4 id="Encoder-base-class-gt-outbound"><a href="#Encoder-base-class-gt-outbound" class="headerlink" title="Encoder base class ==> outbound"></a>Encoder base class ==> outbound</h4><ul>
<li>MessateToByteEncoder </li>
<li>MessageToMessageEncoder </li>
</ul>