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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.logserver.handlers.lasterrorsholder;
import com.yahoo.io.Connection;
import com.yahoo.log.LogLevel;
import com.yahoo.log.LogMessage;
import com.yahoo.logserver.filter.LogFilter;
import com.yahoo.logserver.filter.LogFilterManager;
import com.yahoo.logserver.formatter.LogFormatter;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.SocketChannel;
import java.util.logging.Logger;
/**
* LastErrorsHandler client connection.
*
* @author musum
*/
public class LastErrorsHolderConnection implements Connection, LogFilter {
private static final Logger log = Logger.getLogger(LastErrorsHolderConnection.class.getName());
private final SocketChannel socket;
private ByteBuffer writeBuffer;
private final ByteBuffer readBuffer = ByteBuffer.allocate(4096);
private LogFilter filter = null;
protected LogFormatter formatter = null;
private static final String filterName = "system.mute";
/**
* Constructs a LastErrorsHolderConnection. Note that initially the
* filter of this connection is set to MuteFilter, which mutes
* all log messages.
*/
public LastErrorsHolderConnection(SocketChannel socket) {
this.socket = socket;
this.filter = LogFilterManager.getLogFilter(filterName);
}
/**
* Check if the message is wanted by this particular replicator
* connection. The reason we provide this method is because we
* want to be able to determine if a message is wanted by any
* client before committing resources to creating a ByteBuffer to
* serialize it into.
*
* @param msg The log message offered
*/
public boolean isLoggable(LogMessage msg) {
if (filter == null) {
return true;
}
return filter.isLoggable(msg);
}
/**
* Return the description of the currently active filter.
*/
public String description() {
if (filter == null) {
return "No filter defined";
}
return filter.description();
}
/**
* Enqueues a ByteBuffer containing the message destined
* for the client.
*
* @param buffer the ByteBuffer into which the log message is
* serialized.
*/
public synchronized void enqueue(ByteBuffer buffer) throws IOException {
writeBuffer = buffer;
write();
}
public void read() throws IOException {
if (!readBuffer.hasRemaining()) {
log.warning("Log message too long. Message exceeds "
+ readBuffer.capacity()
+ " bytes. Connection dropped.");
close();
return;
}
int ret = socket.read(readBuffer);
if (ret == -1) {
close();
return;
}
if (ret == 0) {
if (log.isLoggable(LogLevel.INFO)) {
log.log(LogLevel.INFO, "zero byte read occurred");
}
}
readBuffer.flip();
}
public synchronized void write() throws IOException {
if (!socket.isOpen()) {
close();
}
do {
try {
socket.write(writeBuffer);
} catch (IOException e) {
log.log(LogLevel.WARNING, "Error writing", e);
close();
return;
}
} while (writeBuffer.hasRemaining());
}
public synchronized void close() throws IOException {
socket.close();
writeBuffer = null;
}
public int selectOps() {
return SelectionKey.OP_READ;
}
public SocketChannel socketChannel() {
return socket;
}
public void connect() {
}
void setFilter(LogFilter filter) {
this.filter = filter;
}
}
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