spring-session HttpSessionAdapter 源码
spring-session HttpSessionAdapter 代码
文件路径:/spring-session-core/src/main/java/org/springframework/session/web/http/HttpSessionAdapter.java
/*
* Copyright 2014-2019 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
*
* https://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.session.web.http;
import java.time.Duration;
import java.util.Collections;
import java.util.Enumeration;
import java.util.NoSuchElementException;
import java.util.Set;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionBindingListener;
import javax.servlet.http.HttpSessionContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.session.Session;
/**
* Adapts Spring Session's {@link Session} to an {@link HttpSession}.
*
* @param <S> the {@link Session} type
* @author Rob Winch
* @author Vedran Pavic
* @since 1.1
*/
@SuppressWarnings("deprecation")
class HttpSessionAdapter<S extends Session> implements HttpSession {
private static final Log logger = LogFactory.getLog(HttpSessionAdapter.class);
private S session;
private final ServletContext servletContext;
private boolean invalidated;
private boolean old;
HttpSessionAdapter(S session, ServletContext servletContext) {
if (session == null) {
throw new IllegalArgumentException("session cannot be null");
}
if (servletContext == null) {
throw new IllegalArgumentException("servletContext cannot be null");
}
this.session = session;
this.servletContext = servletContext;
}
S getSession() {
return this.session;
}
@Override
public long getCreationTime() {
checkState();
return this.session.getCreationTime().toEpochMilli();
}
@Override
public String getId() {
return this.session.getId();
}
@Override
public long getLastAccessedTime() {
checkState();
return this.session.getLastAccessedTime().toEpochMilli();
}
@Override
public ServletContext getServletContext() {
return this.servletContext;
}
@Override
public void setMaxInactiveInterval(int interval) {
this.session.setMaxInactiveInterval(Duration.ofSeconds(interval));
}
@Override
public int getMaxInactiveInterval() {
return (int) this.session.getMaxInactiveInterval().getSeconds();
}
@Override
public HttpSessionContext getSessionContext() {
return NOOP_SESSION_CONTEXT;
}
@Override
public Object getAttribute(String name) {
checkState();
return this.session.getAttribute(name);
}
@Override
public Object getValue(String name) {
return getAttribute(name);
}
@Override
public Enumeration<String> getAttributeNames() {
checkState();
return Collections.enumeration(this.session.getAttributeNames());
}
@Override
public String[] getValueNames() {
checkState();
Set<String> attrs = this.session.getAttributeNames();
return attrs.toArray(new String[0]);
}
@Override
public void setAttribute(String name, Object value) {
checkState();
Object oldValue = this.session.getAttribute(name);
this.session.setAttribute(name, value);
if (value != oldValue) {
if (oldValue instanceof HttpSessionBindingListener) {
try {
((HttpSessionBindingListener) oldValue)
.valueUnbound(new HttpSessionBindingEvent(this, name, oldValue));
}
catch (Throwable th) {
logger.error("Error invoking session binding event listener", th);
}
}
if (value instanceof HttpSessionBindingListener) {
try {
((HttpSessionBindingListener) value).valueBound(new HttpSessionBindingEvent(this, name, value));
}
catch (Throwable th) {
logger.error("Error invoking session binding event listener", th);
}
}
}
}
@Override
public void putValue(String name, Object value) {
setAttribute(name, value);
}
@Override
public void removeAttribute(String name) {
checkState();
Object oldValue = this.session.getAttribute(name);
this.session.removeAttribute(name);
if (oldValue instanceof HttpSessionBindingListener) {
try {
((HttpSessionBindingListener) oldValue).valueUnbound(new HttpSessionBindingEvent(this, name, oldValue));
}
catch (Throwable th) {
logger.error("Error invoking session binding event listener", th);
}
}
}
@Override
public void removeValue(String name) {
removeAttribute(name);
}
@Override
public void invalidate() {
checkState();
this.invalidated = true;
}
@Override
public boolean isNew() {
checkState();
return !this.old;
}
void markNotNew() {
this.old = true;
}
private void checkState() {
if (this.invalidated) {
throw new IllegalStateException("The HttpSession has already be invalidated.");
}
}
private static final HttpSessionContext NOOP_SESSION_CONTEXT = new HttpSessionContext() {
@Override
public HttpSession getSession(String sessionId) {
return null;
}
@Override
public Enumeration<String> getIds() {
return EMPTY_ENUMERATION;
}
};
private static final Enumeration<String> EMPTY_ENUMERATION = new Enumeration<String>() {
@Override
public boolean hasMoreElements() {
return false;
}
@Override
public String nextElement() {
throw new NoSuchElementException("a");
}
};
}
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