| /* |
| * Copyright (c) 2006-2008, 2011, 2012 Eike Stepper (Berlin, Germany) and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Eike Stepper - initial API and implementation |
| */ |
| package org.eclipse.net4j.signal; |
| |
| import org.eclipse.net4j.buffer.BufferInputStream; |
| import org.eclipse.net4j.buffer.BufferOutputStream; |
| import org.eclipse.net4j.util.StringUtil; |
| import org.eclipse.net4j.util.io.ExtendedDataInputStream; |
| import org.eclipse.net4j.util.io.ExtendedDataOutputStream; |
| |
| /** |
| * Represents the receiver side of a two-way {@link SignalReactor signal}, i.e., one with a response. |
| * |
| * @author Eike Stepper |
| */ |
| public abstract class IndicationWithResponse extends SignalReactor |
| { |
| /** |
| * @since 2.0 |
| */ |
| public IndicationWithResponse(SignalProtocol<?> protocol, short id, String name) |
| { |
| super(protocol, id, name); |
| } |
| |
| /** |
| * @since 2.0 |
| */ |
| public IndicationWithResponse(SignalProtocol<?> protocol, short signalID) |
| { |
| super(protocol, signalID); |
| } |
| |
| /** |
| * @since 2.0 |
| */ |
| public IndicationWithResponse(SignalProtocol<?> protocol, Enum<?> literal) |
| { |
| super(protocol, literal); |
| } |
| |
| /** |
| * @since 4.4 |
| */ |
| protected boolean closeChannelAfterException() |
| { |
| return false; |
| } |
| |
| /** |
| * @since 2.0 |
| */ |
| protected String getExceptionMessage(Throwable t) |
| { |
| return StringUtil.formatException(t); |
| } |
| |
| @Override |
| protected void execute(BufferInputStream in, BufferOutputStream out) throws Exception |
| { |
| boolean responding = false; |
| |
| try |
| { |
| doInput(in); |
| responding = true; |
| doOutput(out); |
| } |
| catch (Error ex) |
| { |
| sendExceptionSignal(ex, responding); |
| throw ex; |
| } |
| catch (Exception ex) |
| { |
| sendExceptionSignal(ex, responding); |
| throw ex; |
| } |
| } |
| |
| protected abstract void indicating(ExtendedDataInputStream in) throws Exception; |
| |
| /** |
| * <b>Important Note:</b> The response must not be empty, i.e. the stream must be used at least to write a |
| * <code>boolean</code>. Otherwise synchronization problems will result! |
| */ |
| protected abstract void responding(ExtendedDataOutputStream out) throws Exception; |
| |
| @Override |
| void doExtendedInput(ExtendedDataInputStream in) throws Exception |
| { |
| indicating(in); |
| } |
| |
| @Override |
| void doExtendedOutput(ExtendedDataOutputStream out) throws Exception |
| { |
| responding(out); |
| } |
| |
| void sendExceptionSignal(Throwable t, boolean responding) throws Exception |
| { |
| SignalProtocol<?> protocol = getProtocol(); |
| int correlationID = -getCorrelationID(); |
| String message = getExceptionMessage(t); |
| final boolean closeChannel = closeChannelAfterException(); |
| |
| RemoteExceptionRequest request = new RemoteExceptionRequest(protocol, correlationID, responding, message, t) |
| { |
| @Override |
| protected boolean closeChannelAfterMe() |
| { |
| return closeChannel; |
| } |
| }; |
| |
| request.sendAsync(); |
| } |
| } |