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<div class="subTitle">org.apache.zookeeper.server.quorum</div>
<h2 title="Class QuorumCnxManager" class="title">Class QuorumCnxManager</h2>
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<pre>public class <span class="typeNameLabel">QuorumCnxManager</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block">This class implements a connection manager for leader election using TCP. It
maintains one connection for every pair of servers. The tricky part is to
guarantee that there is exactly one connection for every pair of servers that
are operating correctly and that can communicate over the network.
If two servers try to start a connection concurrently, then the connection
manager uses a very simple tie-breaking mechanism to decide which connection
to drop based on the IP addressed of the two parties.
For every peer, the manager maintains a queue of messages to send. If the
connection to any particular peer drops, then the sender thread puts the
message back on the list. As this implementation currently uses a queue
implementation to maintain messages to send to another peer, we add the
message to the tail of the queue, thus changing the order of messages.
Although this is not a problem for the leader election, it could be a problem
when consolidating peer communication. This is to be verified, though.</div>
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<td class="colFirst"><code>static class </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.InitialMessage.html" title="class in org.apache.zookeeper.server.quorum">QuorumCnxManager.InitialMessage</a></span></code> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>class </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.Listener.html" title="class in org.apache.zookeeper.server.quorum">QuorumCnxManager.Listener</a></span></code>
<div class="block">Thread to listen on some ports</div>
</td>
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<td class="colFirst"><code>static class </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.Message.html" title="class in org.apache.zookeeper.server.quorum">QuorumCnxManager.Message</a></span></code> </td>
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<td class="colFirst"><code><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.Listener.html" title="class in org.apache.zookeeper.server.quorum">QuorumCnxManager.Listener</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#listener">listener</a></span></code> </td>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#maxBuffer">maxBuffer</a></span></code> </td>
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<td class="colFirst"><code>static long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#PROTOCOL_VERSION_V1">PROTOCOL_VERSION_V1</a></span></code> </td>
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<tr class="rowColor">
<td class="colFirst"><code>static long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#PROTOCOL_VERSION_V2">PROTOCOL_VERSION_V2</a></span></code> </td>
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<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/BlockingQueue.html?is-external=true" title="class or interface in java.util.concurrent">BlockingQueue</a><<a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.Message.html" title="class in org.apache.zookeeper.server.quorum">QuorumCnxManager.Message</a>></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#recvQueue">recvQueue</a></span></code> </td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#QuorumCnxManager-org.apache.zookeeper.server.quorum.QuorumPeer-long-java.util.Map-org.apache.zookeeper.server.quorum.auth.QuorumAuthServer-org.apache.zookeeper.server.quorum.auth.QuorumAuthLearner-int-boolean-int-boolean-">QuorumCnxManager</a></span>(<a href="../../../../../org/apache/zookeeper/server/quorum/QuorumPeer.html" title="class in org.apache.zookeeper.server.quorum">QuorumPeer</a> self,
long mySid,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>,<a href="../../../../../org/apache/zookeeper/server/quorum/QuorumPeer.QuorumServer.html" title="class in org.apache.zookeeper.server.quorum">QuorumPeer.QuorumServer</a>> view,
<a href="../../../../../org/apache/zookeeper/server/quorum/auth/QuorumAuthServer.html" title="interface in org.apache.zookeeper.server.quorum.auth">QuorumAuthServer</a> authServer,
<a href="../../../../../org/apache/zookeeper/server/quorum/auth/QuorumAuthLearner.html" title="interface in org.apache.zookeeper.server.quorum.auth">QuorumAuthLearner</a> authLearner,
int socketTimeout,
boolean listenOnAllIPs,
int quorumCnxnThreadsSize,
boolean quorumSaslAuthEnabled)</code> </td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#addToRecvQueue-org.apache.zookeeper.server.quorum.QuorumCnxManager.Message-">addToRecvQueue</a></span>(<a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.Message.html" title="class in org.apache.zookeeper.server.quorum">QuorumCnxManager.Message</a> msg)</code>
<div class="block">Inserts an element in the <a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#recvQueue"><code>recvQueue</code></a>.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#connectAll--">connectAll</a></span>()</code>
<div class="block">Try to establish a connection with each server if one
doesn't exist.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#connectedToPeer-long-">connectedToPeer</a></span>(long peerSid)</code> </td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#getConnectionThreadCount--">getConnectionThreadCount</a></span>()</code>
<div class="block">Return number of connection processing threads.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#getThreadCount--">getThreadCount</a></span>()</code>
<div class="block">Return number of worker threads</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#halt--">halt</a></span>()</code>
<div class="block">Flag that it is time to wrap up all activities and interrupt the listener.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#initiateConnection-org.apache.zookeeper.server.quorum.MultipleAddresses-java.lang.Long-">initiateConnection</a></span>(<a href="../../../../../org/apache/zookeeper/server/quorum/MultipleAddresses.html" title="class in org.apache.zookeeper.server.quorum">MultipleAddresses</a> electionAddr,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a> sid)</code>
<div class="block">First we create the socket, perform SSL handshake and authentication if needed.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#initiateConnectionAsync-org.apache.zookeeper.server.quorum.MultipleAddresses-java.lang.Long-">initiateConnectionAsync</a></span>(<a href="../../../../../org/apache/zookeeper/server/quorum/MultipleAddresses.html" title="class in org.apache.zookeeper.server.quorum">MultipleAddresses</a> electionAddr,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a> sid)</code>
<div class="block">Server will initiate the connection request to its peer server
asynchronously via separate connection thread.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#isReconfigEnabled--">isReconfigEnabled</a></span>()</code> </td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.Message.html" title="class in org.apache.zookeeper.server.quorum">QuorumCnxManager.Message</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#pollRecvQueue-long-java.util.concurrent.TimeUnit-">pollRecvQueue</a></span>(long timeout,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TimeUnit.html?is-external=true" title="class or interface in java.util.concurrent">TimeUnit</a> unit)</code>
<div class="block">Retrieves and removes a message at the head of this queue,
waiting up to the specified wait time if necessary for an element to
become available.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#receiveConnection-java.net.Socket-">receiveConnection</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/net/Socket.html?is-external=true" title="class or interface in java.net">Socket</a> sock)</code>
<div class="block">If this server receives a connection request, then it gives up on the new
connection if it wins.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#receiveConnectionAsync-java.net.Socket-">receiveConnectionAsync</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/net/Socket.html?is-external=true" title="class or interface in java.net">Socket</a> sock)</code>
<div class="block">Server receives a connection request and handles it asynchronously via
separate thread.</div>
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<tr id="i12" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#softHalt--">softHalt</a></span>()</code>
<div class="block">A soft halt simply finishes workers.</div>
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<tr id="i13" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#testInitiateConnection-long-">testInitiateConnection</a></span>(long sid)</code>
<div class="block">Invokes initiateConnection for testing purposes</div>
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<tr id="i14" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#toSend-java.lang.Long-java.nio.ByteBuffer-">toSend</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a> sid,
<a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a> b)</code>
<div class="block">Processes invoke this message to queue a message to send.</div>
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<pre>public static final long PROTOCOL_VERSION_V1</pre>
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<dd><a href="../../../../../constant-values.html#org.apache.zookeeper.server.quorum.QuorumCnxManager.PROTOCOL_VERSION_V1">Constant Field Values</a></dd>
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<pre>public static final long PROTOCOL_VERSION_V2</pre>
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<dd><a href="../../../../../constant-values.html#org.apache.zookeeper.server.quorum.QuorumCnxManager.PROTOCOL_VERSION_V2">Constant Field Values</a></dd>
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<pre>public final <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/BlockingQueue.html?is-external=true" title="class or interface in java.util.concurrent">BlockingQueue</a><<a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.Message.html" title="class in org.apache.zookeeper.server.quorum">QuorumCnxManager.Message</a>> recvQueue</pre>
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<pre>public final <a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.Listener.html" title="class in org.apache.zookeeper.server.quorum">QuorumCnxManager.Listener</a> listener</pre>
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<pre>public QuorumCnxManager(<a href="../../../../../org/apache/zookeeper/server/quorum/QuorumPeer.html" title="class in org.apache.zookeeper.server.quorum">QuorumPeer</a> self,
long mySid,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>,<a href="../../../../../org/apache/zookeeper/server/quorum/QuorumPeer.QuorumServer.html" title="class in org.apache.zookeeper.server.quorum">QuorumPeer.QuorumServer</a>> view,
<a href="../../../../../org/apache/zookeeper/server/quorum/auth/QuorumAuthServer.html" title="interface in org.apache.zookeeper.server.quorum.auth">QuorumAuthServer</a> authServer,
<a href="../../../../../org/apache/zookeeper/server/quorum/auth/QuorumAuthLearner.html" title="interface in org.apache.zookeeper.server.quorum.auth">QuorumAuthLearner</a> authLearner,
int socketTimeout,
boolean listenOnAllIPs,
int quorumCnxnThreadsSize,
boolean quorumSaslAuthEnabled)</pre>
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<pre>public void testInitiateConnection(long sid)</pre>
<div class="block">Invokes initiateConnection for testing purposes</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>sid</code> - </dd>
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<pre>public void initiateConnection(<a href="../../../../../org/apache/zookeeper/server/quorum/MultipleAddresses.html" title="class in org.apache.zookeeper.server.quorum">MultipleAddresses</a> electionAddr,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a> sid)</pre>
<div class="block">First we create the socket, perform SSL handshake and authentication if needed.
Then we perform the initiation protocol.
If this server has initiated the connection, then it gives up on the
connection if it loses challenge. Otherwise, it keeps the connection.</div>
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<pre>public boolean initiateConnectionAsync(<a href="../../../../../org/apache/zookeeper/server/quorum/MultipleAddresses.html" title="class in org.apache.zookeeper.server.quorum">MultipleAddresses</a> electionAddr,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a> sid)</pre>
<div class="block">Server will initiate the connection request to its peer server
asynchronously via separate connection thread.</div>
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<pre>public void receiveConnection(<a href="https://docs.oracle.com/javase/8/docs/api/java/net/Socket.html?is-external=true" title="class or interface in java.net">Socket</a> sock)</pre>
<div class="block">If this server receives a connection request, then it gives up on the new
connection if it wins. Notice that it checks whether it has a connection
to this server already or not. If it does, then it sends the smallest
possible long value to lose the challenge.</div>
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<pre>public void receiveConnectionAsync(<a href="https://docs.oracle.com/javase/8/docs/api/java/net/Socket.html?is-external=true" title="class or interface in java.net">Socket</a> sock)</pre>
<div class="block">Server receives a connection request and handles it asynchronously via
separate thread.</div>
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<pre>public void toSend(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a> sid,
<a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a> b)</pre>
<div class="block">Processes invoke this message to queue a message to send. Currently,
only leader election uses it.</div>
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<pre>public void connectAll()</pre>
<div class="block">Try to establish a connection with each server if one
doesn't exist.</div>
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<h4>halt</h4>
<pre>public void halt()</pre>
<div class="block">Flag that it is time to wrap up all activities and interrupt the listener.</div>
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<pre>public void softHalt()</pre>
<div class="block">A soft halt simply finishes workers.</div>
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<pre>public long getThreadCount()</pre>
<div class="block">Return number of worker threads</div>
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<pre>public long getConnectionThreadCount()</pre>
<div class="block">Return number of connection processing threads.</div>
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<pre>public void addToRecvQueue(<a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.Message.html" title="class in org.apache.zookeeper.server.quorum">QuorumCnxManager.Message</a> msg)</pre>
<div class="block">Inserts an element in the <a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html#recvQueue"><code>recvQueue</code></a>. If the Queue is full, this
methods removes an element from the head of the Queue and then inserts the
element at the tail of the queue.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>msg</code> - Reference to the message to be inserted in the queue</dd>
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<pre>public <a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.Message.html" title="class in org.apache.zookeeper.server.quorum">QuorumCnxManager.Message</a> pollRecvQueue(long timeout,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TimeUnit.html?is-external=true" title="class or interface in java.util.concurrent">TimeUnit</a> unit)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></pre>
<div class="block">Retrieves and removes a message at the head of this queue,
waiting up to the specified wait time if necessary for an element to
become available.
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/BlockingQueue.html?is-external=true#poll-long-java.util.concurrent.TimeUnit-" title="class or interface in java.util.concurrent"><code>BlockingQueue.poll(long, java.util.concurrent.TimeUnit)</code></a></div>
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<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></code></dd>
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<pre>public boolean connectedToPeer(long peerSid)</pre>
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<pre>public boolean isReconfigEnabled()</pre>
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