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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.cxf.clustering;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.cxf.common.logging.LogUtils;
import org.apache.cxf.endpoint.AbstractConduitSelector;
import org.apache.cxf.endpoint.Client;
import org.apache.cxf.endpoint.Endpoint;
import org.apache.cxf.endpoint.Retryable;
import org.apache.cxf.helpers.CastUtils;
import org.apache.cxf.message.Exchange;
import org.apache.cxf.message.Message;
import org.apache.cxf.service.model.BindingOperationInfo;
import org.apache.cxf.transport.Conduit;
/**
* Implements a target selection strategy based on failover to an
* alternate target endpoint when a transport level failure is
* encountered.
* Note that this feature changes the conduit on the fly and thus makes
* the Client not thread safe.
*/
public class FailoverTargetSelector extends AbstractConduitSelector {
private static final Logger LOG =
LogUtils.getL7dLogger(FailoverTargetSelector.class);
protected Map inProgress;
protected FailoverStrategy failoverStrategy;
/**
* Normal constructor.
*/
public FailoverTargetSelector() {
this(null);
}
/**
* Constructor, allowing a specific conduit to override normal selection.
*
* @param c specific conduit
*/
public FailoverTargetSelector(Conduit c) {
super(c);
inProgress = new ConcurrentHashMap();
}
/**
* Called prior to the interceptor chain being traversed.
*
* @param message the current Message
*/
public synchronized void prepare(Message message) {
Exchange exchange = message.getExchange();
InvocationKey key = new InvocationKey(exchange);
if (!inProgress.containsKey(key)) {
Endpoint endpoint = exchange.get(Endpoint.class);
BindingOperationInfo bindingOperationInfo =
exchange.getBindingOperationInfo();
Object[] params = message.getContent(List.class).toArray();
Map context =
CastUtils.cast((Map)message.get(Message.INVOCATION_CONTEXT));
InvocationContext invocation =
new InvocationContext(endpoint,
bindingOperationInfo,
params,
context);
inProgress.put(key, invocation);
}
}
/**
* Called when a Conduit is actually required.
*
* @param message
* @return the Conduit to use for mediation of the message
*/
public Conduit selectConduit(Message message) {
return getSelectedConduit(message);
}
/**
* Called on completion of the MEP for which the Conduit was required.
*
* @param exchange represents the completed MEP
*/
public void complete(Exchange exchange) {
InvocationKey key = new InvocationKey(exchange);
InvocationContext invocation = null;
synchronized (this) {
invocation = inProgress.get(key);
}
boolean failover = false;
if (requiresFailover(exchange)) {
Endpoint failoverTarget = getFailoverTarget(exchange, invocation);
if (failoverTarget != null) {
setEndpoint(failoverTarget);
selectedConduit.close();
selectedConduit = null;
Exception prevExchangeFault =
(Exception)exchange.remove(Exception.class.getName());
Message outMessage = exchange.getOutMessage();
Exception prevMessageFault =
outMessage.getContent(Exception.class);
outMessage.setContent(Exception.class, null);
overrideAddressProperty(invocation.getContext());
Retryable retry = exchange.get(Retryable.class);
exchange.clear();
if (retry != null) {
try {
failover = true;
long delay = getDelayBetweenRetries();
if (delay > 0) {
Thread.sleep(delay);
}
retry.invoke(invocation.getBindingOperationInfo(),
invocation.getParams(),
invocation.getContext(),
exchange);
} catch (Exception e) {
if (exchange.get(Exception.class) != null) {
exchange.put(Exception.class, prevExchangeFault);
}
if (outMessage.getContent(Exception.class) != null) {
outMessage.setContent(Exception.class,
prevMessageFault);
}
}
}
} else {
setEndpoint(invocation.retrieveOriginalEndpoint(endpoint));
}
}
if (!failover) {
getLogger().info("FAILOVER_NOT_REQUIRED");
synchronized (this) {
inProgress.remove(key);
}
super.complete(exchange);
}
}
/**
* @param strategy the FailoverStrategy to use
*/
public synchronized void setStrategy(FailoverStrategy strategy) {
getLogger().log(Level.INFO, "USING_STRATEGY", new Object[] {strategy});
failoverStrategy = strategy;
}
/**
* @return strategy the FailoverStrategy to use
*/
public synchronized FailoverStrategy getStrategy() {
if (failoverStrategy == null) {
failoverStrategy = new SequentialStrategy();
getLogger().log(Level.INFO,
"USING_STRATEGY",
new Object[] {failoverStrategy});
}
return failoverStrategy;
}
/**
* @return the logger to use
*/
protected Logger getLogger() {
return LOG;
}
/**
* Returns delay (in milliseconds) between retries
* @return delay, 0 means no delay
*/
protected long getDelayBetweenRetries() {
FailoverStrategy strategy = getStrategy();
if (strategy instanceof AbstractStaticFailoverStrategy) {
return ((AbstractStaticFailoverStrategy)strategy).getDelayBetweenRetries();
}
//perhaps supporting FailoverTargetSelector specific property can make sense too
return 0;
}
/**
* Check if the exchange is suitable for a failover.
*
* @param exchange the current Exchange
* @return boolean true if a failover should be attempted
*/
protected boolean requiresFailover(Exchange exchange) {
Message outMessage = exchange.getOutMessage();
Exception ex = outMessage.get(Exception.class) != null
? outMessage.get(Exception.class)
: exchange.get(Exception.class);
getLogger().log(Level.FINE,
"CHECK_LAST_INVOKE_FAILED",
new Object[] {ex != null});
Throwable curr = ex;
boolean failover = false;
while (curr != null) {
failover = curr instanceof java.io.IOException;
curr = curr.getCause();
}
if (ex != null) {
getLogger().log(Level.INFO,
"CHECK_FAILURE_IN_TRANSPORT",
new Object[] {ex, failover});
}
return failover;
}
/**
* Get the failover target endpoint, if a suitable one is available.
*
* @param exchange the current Exchange
* @param invocation the current InvocationContext
* @return a failover endpoint if one is available
*/
protected Endpoint getFailoverTarget(Exchange exchange,
InvocationContext invocation) {
List alternateAddresses = null;
if (!invocation.hasAlternates()) {
// no previous failover attempt on this invocation
//
alternateAddresses =
getStrategy().getAlternateAddresses(exchange);
if (alternateAddresses != null) {
invocation.setAlternateAddresses(alternateAddresses);
} else {
invocation.setAlternateEndpoints(
getStrategy().getAlternateEndpoints(exchange));
}
} else {
alternateAddresses = invocation.getAlternateAddresses();
}
Endpoint failoverTarget = null;
if (alternateAddresses != null) {
String alternateAddress =
getStrategy().selectAlternateAddress(alternateAddresses);
if (alternateAddress != null) {
// re-use current endpoint
//
failoverTarget = getEndpoint();
failoverTarget.getEndpointInfo().setAddress(alternateAddress);
}
} else {
failoverTarget = getStrategy().selectAlternateEndpoint(
invocation.getAlternateEndpoints());
}
return failoverTarget;
}
/**
* Override the ENDPOINT_ADDRESS property in the request context
*
* @param context the request context
*/
protected void overrideAddressProperty(Map context) {
Map requestContext =
CastUtils.cast((Map)context.get(Client.REQUEST_CONTEXT));
if (requestContext != null) {
requestContext.put(Message.ENDPOINT_ADDRESS,
getEndpoint().getEndpointInfo().getAddress());
requestContext.put("javax.xml.ws.service.endpoint.address",
getEndpoint().getEndpointInfo().getAddress());
}
}
/**
* Used to wrap an Exchange for usage as a Map key. The raw Exchange
* is not a suitable key type, as the hashCode is computed from its
* current contents, which may obviously change over the lifetime of
* an invocation.
*/
protected static class InvocationKey {
private Exchange exchange;
InvocationKey(Exchange ex) {
exchange = ex;
}
@Override
public int hashCode() {
return System.identityHashCode(exchange);
}
@Override
public boolean equals(Object o) {
return o instanceof InvocationKey
&& exchange == ((InvocationKey)o).exchange;
}
}
/**
* Records the context of an invocation.
*/
protected class InvocationContext {
private Endpoint originalEndpoint;
private String originalAddress;
private BindingOperationInfo bindingOperationInfo;
private Object[] params;
private Map context;
private List alternateEndpoints;
private List alternateAddresses;
InvocationContext(Endpoint endpoint,
BindingOperationInfo boi,
Object[] prms,
Map ctx) {
originalEndpoint = endpoint;
originalAddress = endpoint.getEndpointInfo().getAddress();
bindingOperationInfo = boi;
params = prms;
context = ctx;
}
Endpoint retrieveOriginalEndpoint(Endpoint endpoint) {
if (endpoint != originalEndpoint) {
getLogger().log(Level.INFO,
"REVERT_TO_ORIGINAL_TARGET",
endpoint.getEndpointInfo().getName());
}
if (!endpoint.getEndpointInfo().getAddress().equals(originalAddress)) {
endpoint.getEndpointInfo().setAddress(originalAddress);
getLogger().log(Level.INFO,
"REVERT_TO_ORIGINAL_ADDRESS",
endpoint.getEndpointInfo().getAddress());
}
return originalEndpoint;
}
BindingOperationInfo getBindingOperationInfo() {
return bindingOperationInfo;
}
Object[] getParams() {
return params;
}
Map getContext() {
return context;
}
List getAlternateEndpoints() {
return alternateEndpoints;
}
List getAlternateAddresses() {
return alternateAddresses;
}
void setAlternateEndpoints(List alternates) {
alternateEndpoints = alternates;
}
void setAlternateAddresses(List alternates) {
alternateAddresses = alternates;
}
boolean hasAlternates() {
return !(alternateEndpoints == null && alternateAddresses == null);
}
}
}
