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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.jrt;
import java.nio.channels.SocketChannel;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* The Transport class is the core needed to make your {@link
* Supervisor} tick. It implements the reactor pattern to perform
* multiplexed network IO, handles scheduled tasks and keeps track of
* some additional helper threads. A single Transport object can back
* multiple {@link Supervisor} objects.
*/
public class Transport {
private static final Logger log = Logger.getLogger(Transport.class.getName());
private final String name;
private final FatalErrorHandler fatalHandler; // NB: this must be set first
private final CryptoEngine cryptoEngine;
private final Connector connector;
private final Worker worker;
private final AtomicInteger runCnt;
private final boolean tcpNoDelay;
private final int eventsBeforeWakeup;
private final TransportMetrics metrics = TransportMetrics.getInstance();
private final List<TransportThread> threads = new ArrayList<>();
private final Random rnd = new Random();
/**
* Creates a new Transport object with the given fatal error
* handler and CryptoEngine. If a fatal error occurs when no fatal
* error handler is registered, the default action is to log the
* error and exit with exit code 1.
*
* @param name used for identifying threads
* @param fatalHandler fatal error handler
* @param cryptoEngine crypto engine to use
* @param numThreads number of {@link TransportThread}s.
* @param eventsBeforeWakeup number write events in Q before waking thread up
*/
public Transport(String name, FatalErrorHandler fatalHandler, CryptoEngine cryptoEngine, int numThreads, boolean tcpNoDelay, int eventsBeforeWakeup) {
this.name = name;
this.fatalHandler = fatalHandler; // NB: this must be set first
this.cryptoEngine = cryptoEngine;
this.tcpNoDelay = tcpNoDelay;
this.eventsBeforeWakeup = Math.max(1, eventsBeforeWakeup);
connector = new Connector();
worker = new Worker(this);
runCnt = new AtomicInteger(numThreads);
for (int i = 0; i < numThreads; ++i) {
threads.add(new TransportThread(this, i));
}
}
public Transport(String name, CryptoEngine cryptoEngine, int numThreads, int eventsBeforeWakeup) {
this(name, null, cryptoEngine, numThreads, true, eventsBeforeWakeup);
}
public Transport(String name, CryptoEngine cryptoEngine, int numThreads) {
this(name, null, cryptoEngine, numThreads, true, 1);
}
public Transport(String name, int numThreads, int eventsBeforeWakeup) {
this(name, null, CryptoEngine.createDefault(), numThreads, true, eventsBeforeWakeup);
}
public Transport(String name, int numThreads, boolean tcpNoDelay, int eventsBeforeWakeup) {
this(name, null, CryptoEngine.createDefault(), numThreads, tcpNoDelay, eventsBeforeWakeup); }
public Transport(String name, int numThreads) {
this(name, null, CryptoEngine.createDefault(), numThreads, true, 1);
}
public Transport(String name) {
this(name, null, CryptoEngine.createDefault(), 1, true, 1);
}
// Only for testing
public Transport() { this("default"); }
/** Selects and returns a random transport thread. */
public TransportThread selectThread() {
return threads.get(rnd.nextInt(threads.size()));
}
boolean getTcpNoDelay() { return tcpNoDelay; }
int getEventsBeforeWakeup() { return eventsBeforeWakeup; }
public String getName() { return name; }
/**
* Uses the underlying CryptoEngine to create a CryptoSocket for
* the client side of a connection.
*
* @return CryptoSocket handling appropriate encryption
* @param channel low-level socket channel to be wrapped by the CryptoSocket
* @param spec who we are connecting to, for hostname validation
*/
CryptoSocket createClientCryptoSocket(SocketChannel channel, Spec spec) {
return cryptoEngine.createClientCryptoSocket(channel, spec);
}
/**
* Uses the underlying CryptoEngine to create a CryptoSocket for
* the server side of a connection.
*
* @return CryptoSocket handling appropriate encryption
* @param channel low-level socket channel to be wrapped by the CryptoSocket
*/
CryptoSocket createServerCryptoSocket(SocketChannel channel) {
return cryptoEngine.createServerCryptoSocket(channel);
}
/**
* Proxy method used to dispatch fatal errors to the fatal error
* handler. If no handler is registered, the default action is to
* log the error and halt the Java VM.
*
* @param problem the throwable causing the failure
* @param context the object owning the crashing thread
*/
void handleFailure(Throwable problem, Object context) {
if (fatalHandler != null) {
fatalHandler.handleFailure(problem, context);
return;
}
try {
log.log(Level.SEVERE, "fatal error in " + context, problem);
} catch (Throwable ignore) {}
Runtime.getRuntime().halt(1);
}
/**
* Listens to the given address. This method is called by a {@link
* Supervisor} object.
*
* @return active object accepting new connections
* @param owner the one calling this method
* @param spec the address to listen to
*/
Acceptor listen(Supervisor owner, Spec spec) throws ListenFailedException {
return new Acceptor(this, owner, spec);
}
/**
* Connects to the given address. This method is called by a {@link
* Supervisor} object.
*
* @return the new connection
* @param owner the one calling this method
* @param spec the address to connect to
* @param context application context for the new connection
*/
Connection connect(Supervisor owner, Spec spec, Object context) {
Connection conn = new Connection(selectThread(), owner, spec, context, getTcpNoDelay());
connector.connectLater(conn);
return conn;
}
void closeLater(Connection c) {
worker.closeLater(c);
}
/**
* Requests that {@link Connection#doHandshakeWork()} be called (in any thread)
* followed by a call to {@link Connection#handleHandshakeWorkDone()} from the transport thread.
*
* @param conn the connection needing handshake work
*/
void doHandshakeWork(Connection conn) {
worker.doHandshakeWork(conn);
}
/**
* Synchronizes with all transport threads. This method will block
* until all commands issued before this method was invoked has
* completed. If a transport thread has been shut down (or is in
* the progress of being shut down) this method will instead wait
* for the transport thread to complete, since no more commands
* will be performed, and waiting would be forever. Invoking this
* method from a transport thread is not a good idea.
*
* @return this object, to enable chaining
*/
public Transport sync() {
for (TransportThread thread: threads) {
thread.sync();
}
return this;
}
/**
* Initiates controlled shutdown of all transport threads.
*
* @return this object, to enable chaining with join
*/
public Transport shutdown() {
connector.close();
for (TransportThread thread: threads) {
thread.shutdown();
}
return this;
}
/**
* Waits for all transport threads to finish.
*/
public void join() {
for (TransportThread thread: threads) {
thread.join();
}
}
void notifyDone(TransportThread self) {
if (runCnt.decrementAndGet() == 0) {
worker.shutdown().join();
try { cryptoEngine.close(); } catch (Exception e) {}
}
}
public TransportMetrics metrics() {
return metrics;
}
}
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