/*
* Copyright 2002-2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.messaging.simp;
import java.security.Principal;
import java.util.List;
import java.util.Map;
import org.springframework.messaging.Message;
import org.springframework.messaging.support.IdTimestampMessageHeaderInitializer;
import org.springframework.messaging.support.MessageHeaderAccessor;
import org.springframework.messaging.support.NativeMessageHeaderAccessor;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
/**
* A base class for working with message headers in simple messaging protocols that
* support basic messaging patterns. Provides uniform access to specific values common
* across protocols such as a destination, message type (e.g. publish, subscribe, etc),
* session id, and others.
*
* <p>Use one of the static factory method in this class, then call getters and setters,
* and at the end if necessary call {@link #toMap()} to obtain the updated headers.
*
* @author Rossen Stoyanchev
* @since 4.0
*/
public class SimpMessageHeaderAccessor extends NativeMessageHeaderAccessor {
private static final IdTimestampMessageHeaderInitializer headerInitializer;
static {
headerInitializer = new IdTimestampMessageHeaderInitializer();
headerInitializer.setDisableIdGeneration();
headerInitializer.setEnableTimestamp(false);
}
// SiMP header names
public static final String DESTINATION_HEADER = "simpDestination";
public static final String MESSAGE_TYPE_HEADER = "simpMessageType";
public static final String SESSION_ID_HEADER = "simpSessionId";
public static final String SESSION_ATTRIBUTES = "simpSessionAttributes";
public static final String SUBSCRIPTION_ID_HEADER = "simpSubscriptionId";
public static final String USER_HEADER = "simpUser";
public static final String CONNECT_MESSAGE_HEADER = "simpConnectMessage";
public static final String DISCONNECT_MESSAGE_HEADER = "simpDisconnectMessage";
public static final String HEART_BEAT_HEADER = "simpHeartbeat";
/**
* A header for internal use with "user" destinations where we need to
* restore the destination prior to sending messages to clients.
*/
public static final String ORIGINAL_DESTINATION = "simpOrigDestination";
/**
* A header that indicates to the broker that the sender will ignore errors.
* The header is simply checked for presence or absence.
*/
public static final String IGNORE_ERROR = "simpIgnoreError";
/**
* A constructor for creating new message headers.
* This constructor is protected. See factory methods in this and sub-classes.
*/
protected SimpMessageHeaderAccessor(SimpMessageType messageType, Map<String, List<String>> externalSourceHeaders) {
super(externalSourceHeaders);
Assert.notNull(messageType, "MessageType must not be null");
setHeader(MESSAGE_TYPE_HEADER, messageType);
headerInitializer.initHeaders(this);
}
/**
* A constructor for accessing and modifying existing message headers. This
* constructor is protected. See factory methods in this and sub-classes.
*/
protected SimpMessageHeaderAccessor(Message<?> message) {
super(message);
headerInitializer.initHeaders(this);
}
@Override
protected MessageHeaderAccessor createAccessor(Message<?> message) {
return wrap(message);
}
public void setMessageTypeIfNotSet(SimpMessageType messageType) {
if (getMessageType() == null) {
setHeader(MESSAGE_TYPE_HEADER, messageType);
}
}
public SimpMessageType getMessageType() {
return (SimpMessageType) getHeader(MESSAGE_TYPE_HEADER);
}
public void setDestination(String destination) {
Assert.notNull(destination, "Destination must not be null");
setHeader(DESTINATION_HEADER, destination);
}
public String getDestination() {
return (String) getHeader(DESTINATION_HEADER);
}
public void setSubscriptionId(String subscriptionId) {
setHeader(SUBSCRIPTION_ID_HEADER, subscriptionId);
}
public String getSubscriptionId() {
return (String) getHeader(SUBSCRIPTION_ID_HEADER);
}
public void setSessionId(String sessionId) {
setHeader(SESSION_ID_HEADER, sessionId);
}
/**
* @return the id of the current session
*/
public String getSessionId() {
return (String) getHeader(SESSION_ID_HEADER);
}
/**
* A static alternative for access to the session attributes header.
*/
public void setSessionAttributes(Map<String, Object> attributes) {
setHeader(SESSION_ATTRIBUTES, attributes);
}
/**
* Return the attributes associated with the current session.
*/
@SuppressWarnings("unchecked")
public Map<String, Object> getSessionAttributes() {
return (Map<String, Object>) getHeader(SESSION_ATTRIBUTES);
}
public void setUser(Principal principal) {
setHeader(USER_HEADER, principal);
}
/**
* Return the user associated with the current session.
*/
public Principal getUser() {
return (Principal) getHeader(USER_HEADER);
}
@Override
public String getShortLogMessage(Object payload) {
if (getMessageType() == null) {
return super.getDetailedLogMessage(payload);
}
StringBuilder sb = getBaseLogMessage();
if (!CollectionUtils.isEmpty(getSessionAttributes())) {
sb.append(" attributes[").append(getSessionAttributes().size()).append("]");
}
sb.append(getShortPayloadLogMessage(payload));
return sb.toString();
}
@SuppressWarnings("unchecked")
@Override
public String getDetailedLogMessage(Object payload) {
if (getMessageType() == null) {
return super.getDetailedLogMessage(payload);
}
StringBuilder sb = getBaseLogMessage();
if (!CollectionUtils.isEmpty(getSessionAttributes())) {
sb.append(" attributes=").append(getSessionAttributes());
}
if (!CollectionUtils.isEmpty((Map<String, List<String>>) getHeader(NATIVE_HEADERS))) {
sb.append(" nativeHeaders=").append(getHeader(NATIVE_HEADERS));
}
sb.append(getDetailedPayloadLogMessage(payload));
return sb.toString();
}
private StringBuilder getBaseLogMessage() {
StringBuilder sb = new StringBuilder();
sb.append(getMessageType().name());
if (getDestination() != null) {
sb.append(" destination=").append(getDestination());
}
if (getSubscriptionId() != null) {
sb.append(" subscriptionId=").append(getSubscriptionId());
}
sb.append(" session=").append(getSessionId());
if (getUser() != null) {
sb.append(" user=").append(getUser().getName());
}
return sb;
}
// Static factory methods and accessors
/**
* Create an instance with
* {@link org.springframework.messaging.simp.SimpMessageType} {@code MESSAGE}.
*/
public static SimpMessageHeaderAccessor create() {
return new SimpMessageHeaderAccessor(SimpMessageType.MESSAGE, null);
}
/**
* Create an instance with the given
* {@link org.springframework.messaging.simp.SimpMessageType}.
*/
public static SimpMessageHeaderAccessor create(SimpMessageType messageType) {
return new SimpMessageHeaderAccessor(messageType, null);
}
/**
* Create an instance from the payload and headers of the given Message.
*/
public static SimpMessageHeaderAccessor wrap(Message<?> message) {
return new SimpMessageHeaderAccessor(message);
}
public static SimpMessageType getMessageType(Map<String, Object> headers) {
return (SimpMessageType) headers.get(MESSAGE_TYPE_HEADER);
}
public static String getDestination(Map<String, Object> headers) {
return (String) headers.get(DESTINATION_HEADER);
}
public static String getSubscriptionId(Map<String, Object> headers) {
return (String) headers.get(SUBSCRIPTION_ID_HEADER);
}
public static String getSessionId(Map<String, Object> headers) {
return (String) headers.get(SESSION_ID_HEADER);
}
@SuppressWarnings("unchecked")
public static Map<String, Object> getSessionAttributes(Map<String, Object> headers) {
return (Map<String, Object>) headers.get(SESSION_ATTRIBUTES);
}
public static Principal getUser(Map<String, Object> headers) {
return (Principal) headers.get(USER_HEADER);
}
public static long[] getHeartbeat(Map<String, Object> headers) {
return (long[]) headers.get(HEART_BEAT_HEADER);
}
}