com.sun.grizzly.nio.tmpselectors.TemporarySelectorReader Maven / Gradle / Ivy
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package com.sun.grizzly.nio.tmpselectors;
import java.io.EOFException;
import java.io.IOException;
import java.net.SocketAddress;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.logging.Logger;
import com.sun.grizzly.AbstractReader;
import com.sun.grizzly.Buffer;
import com.sun.grizzly.CompletionHandler;
import com.sun.grizzly.Connection;
import com.sun.grizzly.Grizzly;
import com.sun.grizzly.Interceptor;
import com.sun.grizzly.ReadResult;
import com.sun.grizzly.Reader;
import com.sun.grizzly.Transport;
import com.sun.grizzly.impl.ReadyFutureImpl;
import com.sun.grizzly.nio.NIOConnection;
import com.sun.grizzly.utils.conditions.Condition;
/**
*
* @author oleksiys
*/
public abstract class TemporarySelectorReader
extends AbstractReader {
private static final int DEFAULT_TIMEOUT = 30000;
public static final int DEFAULT_BUFFER_SIZE = 8192;
protected int defaultBufferSize = DEFAULT_BUFFER_SIZE;
protected final TemporarySelectorsEnabledTransport transport;
private Logger logger = Grizzly.logger;
private int timeoutMillis = DEFAULT_TIMEOUT;
public TemporarySelectorReader(
TemporarySelectorsEnabledTransport transport) {
this.transport = transport;
}
public int getTimeout() {
return timeoutMillis;
}
public void setTimeout(int timeout) {
this.timeoutMillis = timeout;
}
/**
* {@inheritDoc}
*/
public Future> read(Connection connection,
Buffer buffer,
CompletionHandler> completionHandler,
Interceptor interceptor) throws IOException {
return read(connection, buffer, completionHandler, interceptor,
timeoutMillis, TimeUnit.MILLISECONDS);
}
/**
* Method reads data to the message.
*
* @param connection the {@link Connection} to read from
* @param message the message, where data will be read
* @param completionHandler {@link CompletionHandler},
* which will get notified, when read will be completed
* @param condition {@link Condition}, which will be checked
* each time new portion of a data was read to a buffer.
* The condition can decide, whether asynchronous read is
* completed or not.
* @param timeout operation timeout value value
* @param timeunit the timeout unit
* @return {@link Future}, using which it's possible to check the result
* @throws java.io.IOException
*/
public Future> read(Connection connection,
Buffer buffer,
CompletionHandler> completionHandler,
Interceptor interceptor,
long timeout, TimeUnit timeunit) throws IOException {
if (connection == null || !(connection instanceof NIOConnection)) {
throw new IllegalStateException(
"Connection should be NIOConnection and cannot be null.");
}
ReadResult currentResult =
new ReadResult(connection, buffer, null, 0);
ReadyFutureImpl> currentFuture =
new ReadyFutureImpl>(currentResult);
if (buffer == null) {
buffer = acquireBuffer(connection);
}
boolean isCompleted = false;
while (!isCompleted) {
isCompleted = true;
int readBytes = read0(connection, currentResult, buffer,
timeout, timeunit);
if (readBytes <= 0) {
currentFuture.failure(new TimeoutException());
} else if (interceptor != null) {
isCompleted = (interceptor.intercept(Reader.READ_EVENT,
null, currentResult) & Interceptor.COMPLETED) != 0;
}
}
if (completionHandler != null) {
completionHandler.completed(connection, currentResult);
}
if (interceptor != null) {
interceptor.intercept(timeoutMillis, connection, currentResult);
}
return currentFuture;
}
protected int read0(Connection connection, ReadResult currentResult,
Buffer buffer, long timeout, TimeUnit timeunit)
throws IOException {
int bytesRead;
NIOConnection nioConnection = (NIOConnection) connection;
Selector readSelector = null;
SelectionKey key = null;
SelectableChannel channel = nioConnection.getChannel();
long readTimeout = TimeUnit.MILLISECONDS.convert(timeout, timeunit);
try {
bytesRead = readNow0(connection, buffer, currentResult);
if (bytesRead == 0) {
readSelector = transport.getTemporarySelectorIO().
getSelectorPool().poll();
if (readSelector == null) {
return bytesRead;
}
key = channel.register(readSelector, SelectionKey.OP_READ);
key.interestOps(key.interestOps() | SelectionKey.OP_READ);
int code = readSelector.select(readTimeout);
key.interestOps(
key.interestOps() & (~SelectionKey.OP_READ));
if (code == 0) {
return bytesRead; // Return on the main Selector and try again.
}
bytesRead = readNow0(connection, buffer, currentResult);
}
if (bytesRead == -1) {
throw new EOFException();
}
} finally {
transport.getTemporarySelectorIO().recycleTemporaryArtifacts(
readSelector, key);
}
return bytesRead;
}
protected abstract int readNow0(Connection connection,
Buffer buffer, ReadResult currentResult) throws IOException;
protected Buffer acquireBuffer(Connection connection) {
Transport connectionTransport = connection.getTransport();
return connectionTransport.getMemoryManager().
allocate(defaultBufferSize);
}
private void releaseBuffer(Connection connection,
Buffer inputBuffer) {
Transport connectionTransport = connection.getTransport();
connectionTransport.getMemoryManager().release(inputBuffer);
}
public TemporarySelectorsEnabledTransport getTransport() {
return transport;
}
}
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