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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2008-2015 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
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* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
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* exception as provided by Oracle in the GPL Version 2 section of the License
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*
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* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package org.glassfish.grizzly;
import java.io.IOException;
import java.util.concurrent.Future;
import org.glassfish.grizzly.asyncqueue.MessageCloner;
import org.glassfish.grizzly.asyncqueue.WritableMessage;
/**
* Implementations of this interface are able to write data from a {@link Buffer}
* to {@link Connection}.
*
* There are two basic Writer implementations in Grizzly:
* {@link org.glassfish.grizzly.asyncqueue.AsyncQueueWriter},
* {@link org.glassfish.grizzly.nio.tmpselectors.TemporarySelectorWriter}.
*
* @param the writer address type
*
* @author Alexey Stashok
*/
@SuppressWarnings("deprecation")
public interface Writer {
/**
* Method writes the {@link WritableMessage}.
*
*
* @param connection the {@link org.glassfish.grizzly.Connection} to write to
* @param message the {@link WritableMessage}, from which the data will be written
* @return {@link Future}, using which it's possible to check the
* result
*/
GrizzlyFuture> write(Connection connection,
WritableMessage message) throws IOException;
/**
* Method writes the {@link WritableMessage}.
*
*
* @param connection the {@link org.glassfish.grizzly.Connection} to write to
* @param message the {@link WritableMessage}, from which the data will be written
* @param completionHandler {@link org.glassfish.grizzly.CompletionHandler},
* which will get notified, when write will be completed
*/
void write(Connection connection,
WritableMessage message,
CompletionHandler> completionHandler);
/**
* Method writes the {@link WritableMessage} to the specific address.
*
*
* @param connection the {@link org.glassfish.grizzly.Connection} to write to
* @param dstAddress the destination address the {@link WritableMessage} will be
* sent to
* @param message the {@link WritableMessage}, from which the data will be written
* @return {@link Future}, using which it's possible to check the
* result
*/
GrizzlyFuture> write(Connection connection,
L dstAddress, WritableMessage message);
/**
* Method writes the {@link WritableMessage} to the specific address.
*
*
* @param connection the {@link org.glassfish.grizzly.Connection} to write to
* @param dstAddress the destination address the {@link WritableMessage} will be
* sent to
* @param message the {@link WritableMessage}, from which the data will be written
* @param completionHandler {@link org.glassfish.grizzly.CompletionHandler},
* which will get notified, when write will be completed
*/
void write(Connection connection,
L dstAddress, WritableMessage message,
CompletionHandler> completionHandler);
/**
* Method writes the {@link WritableMessage} to the specific address.
*
*
* @param connection the {@link org.glassfish.grizzly.Connection} to write to
* @param dstAddress the destination address the {@link WritableMessage} will be
* sent to
* @param message the {@link WritableMessage}, from which the data will be written
* @param completionHandler {@link org.glassfish.grizzly.CompletionHandler},
* which will get notified, when write will be completed
* @param pushBackHandler {@link org.glassfish.grizzly.asyncqueue.PushBackHandler}, which will be notified
* if message was accepted by transport write queue or refused
* @deprecated push back logic is deprecated
*/
void write(
Connection connection,
L dstAddress, WritableMessage message,
CompletionHandler> completionHandler,
org.glassfish.grizzly.asyncqueue.PushBackHandler pushBackHandler);
/**
* Method writes the {@link WritableMessage} to the specific address.
*
*
* @param connection the {@link org.glassfish.grizzly.Connection} to write to
* @param dstAddress the destination address the {@link WritableMessage} will be
* sent to
* @param message the {@link WritableMessage}, from which the data will be written
* @param completionHandler {@link org.glassfish.grizzly.CompletionHandler},
* which will get notified, when write will be completed
* @param messageCloner the {@link MessageCloner}, which will be able to
* clone the message in case it can't be completely written in the
* current thread.
*/
void write(
Connection connection,
L dstAddress, WritableMessage message,
CompletionHandler> completionHandler,
MessageCloner messageCloner);
/**
* Return true if the connection has not exceeded it's maximum
* size in bytes of pending writes, otherwise false.
*
* @param connection the {@link Connection} to test whether or not the
* specified number of bytes can be written to.
* @return true if the connection has not exceeded it's maximum
* size in bytes of pending writes, otherwise false
*
* @since 2.3
*/
boolean canWrite(final Connection connection);
/**
* Registers {@link WriteHandler}, which will be notified ones at least one
* byte can be written.
*
* This method call is equivalent to call notifyWritePossible(connection, writeHandler, 1);
*
* Note: using this method from different threads simultaneously may lead
* to quick situation changes, so at time {@link WriteHandler} is called -
* the queue may become busy again.
*
* @param connection {@link Connection}
* @param writeHandler {@link WriteHandler} to be notified.
*
* @since 2.3
*/
void notifyWritePossible(final Connection connection,
final WriteHandler writeHandler);
/**
* Write reentrants counter
*/
final class Reentrant {
private static final ThreadLocal REENTRANTS_COUNTER =
new ThreadLocal() {
@Override
protected Reentrant initialValue() {
return new Reentrant();
}
};
private static final int maxWriteReentrants = Integer.getInteger(
"org.glassfish.grizzly.Writer.max-write-reentrants", 10);
/**
* Returns the maximum number of write() method reentrants a thread is
* allowed to made. This is related to possible
* write()->onComplete()->write()->... chain, which may grow infinitely
* and cause StackOverflow. Using maxWriteReentrants value it's possible
* to limit such a chain.
*
* @return the maximum number of write() method reentrants a thread is
* allowed to make.
*/
public static int getMaxReentrants() {
return maxWriteReentrants;
}
/**
* Returns the current write reentrants counter. Might be useful, if
* developer wants to use custom notification mechanism, based on on {@link #canWrite(org.glassfish.grizzly.Connection)}
* and various write methods.
*/
public static Reentrant getWriteReentrant() {
// ThreadLocal otherwise
return REENTRANTS_COUNTER.get();
}
private int counter;
/**
* Returns the value of the reentrants counter for the current thread.
*/
public int get() {
return counter;
}
/**
* Increments the reentrants counter by one.
*
* @return true if the counter (after incrementing) didn't reach
* {@link #getMaxReentrants()} limit, or false otherwise.
*/
public boolean inc() {
return ++counter <= maxWriteReentrants;
}
/**
* Decrements the reentrants counter by one.
*
* @return true if the counter (after decrementing) didn't reach
* {@link #getMaxReentrants()} limit, or false otherwise.
*/
public boolean dec() {
return --counter <= maxWriteReentrants;
}
/**
* Returns true, if max number of write->completion-handler
* reentrants has been reached for the passed {@link Reentrant} object,
* and next write will happen in the separate thread.
*
* @return true, if max number of write->completion-handler
* reentrants has been reached for the passed {@link Reentrant} object,
* and next write will happen in the separate thread.
*/
public boolean isMaxReentrantsReached() {
return get() >= getMaxReentrants();
}
}
}
