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| <h2 title="Class IncomingPacket" class="title">Class IncomingPacket</h2> |
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| <pre>public class <span class="typeNameLabel">IncomingPacket</span> |
| extends java.lang.Object</pre> |
| <div class="block">Defines IncomingPacket |
| <p> |
| TODO -- Sanjeev will add a detailed description of this application level protocol later |
| <p> |
| When allocating the ByteBuffer, we have two options: |
| 1. Normal java heap buffer by invoking ByteBuffer.allocate(...), |
| 2. Native heap buffer by invoking ByteBuffer.allocateDirect(...), |
| Though it would require extra memory copies in java heap buffer, after experiments trying to use |
| both of them, we choose to use normal java heap buffer, since: |
| 1. It is unsafe to use direct buffer: |
| -- Direct buffer would not trigger gc; |
| -- We could not control when to release the resources of direct buffer explicitly; |
| -- It is hard to guarantee direct buffer would not break limitation of native heap, |
| i.e. not throw OutOfMemoryError. |
| <p> |
| 2. Experiments are done by using direct buffer and the resources saving is negligible: |
| -- Direct buffer would save, in our scenarios, less than 1% of RAM; |
| -- Direct buffer could save 30%~50% CPU of Gateway thread. |
| However, the CPU used by Gateway thread is negligible, |
| less than 2% out of the whole usage in worst case. |
| -- The extra copy is within JVM boundary; it is pretty fast.</div> |
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| <td class="colFirst"><code>int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#readFromChannel(java.nio.channels.SocketChannel)">readFromChannel</a></span>​(java.nio.channels.SocketChannel channel)</code></th> |
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| <td class="colFirst"><code>int</code></td> |
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| long limit)</code></th> |
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| <td class="colFirst"><code>void</code></td> |
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| <td class="colFirst"><code><a href="REQID.html" title="class in org.apache.heron.common.network">REQID</a></code></td> |
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| <pre>public IncomingPacket()</pre> |
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