/*
* Copyright 2014-2017 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.integration.support;
import java.io.Serializable;
import java.util.Map;
import org.springframework.integration.store.SimpleMessageStore;
import org.springframework.messaging.Message;
import org.springframework.messaging.support.GenericMessage;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;
/**
* An implementation of {@link Message} with a generic payload. Unlike
* {@link GenericMessage}, this message (or its headers) can be modified
* after creation. Great care must be taken, when mutating messages, that
* some other element/thread is not concurrently using the message. Also note
* that any in-memory stores (such as {@link SimpleMessageStore}) may have
* a reference to the message and changes will be reflected there too.
*
* @author Gary Russell
* @author Artem Bilan
* @author Stuart Williams
* @author David Turanski
* @since 4.0
*
*/
public class MutableMessage<T> implements Message<T>, Serializable {
private static final long serialVersionUID = -636635024258737500L;
private final T payload;
private final MutableMessageHeaders headers;
public MutableMessage(T payload) {
this(payload, null);
}
public MutableMessage(T payload, Map<String, Object> headers) {
Assert.notNull(payload, "payload must not be null");
this.payload = payload;
this.headers = new MutableMessageHeaders(headers);
}
@Override
public MutableMessageHeaders getHeaders() {
return this.headers;
}
@Override
public T getPayload() {
return this.payload;
}
Map<String, Object> getRawHeaders() {
return this.headers.getRawHeaders();
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
if (this.payload instanceof byte[]) {
sb.append("[Payload byte[").append(((byte[]) this.payload).length).append("]]");
}
else {
sb.append("[Payload ").append(this.payload.getClass().getSimpleName());
sb.append(" content=").append(this.payload).append("]");
}
sb.append("[Headers=").append(this.headers).append("]");
return sb.toString();
}
@Override
public int hashCode() {
return this.headers.hashCode() * 23 + ObjectUtils.nullSafeHashCode(this.payload);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj != null && obj instanceof MutableMessage<?>) {
MutableMessage<?> other = (MutableMessage<?>) obj;
return (this.headers.getId().equals(other.headers.getId()) &&
this.headers.equals(other.headers) && this.payload.equals(other.payload));
}
return false;
}
}