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org.wildfly.naming.client.remote.RemoteContext Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source.
* Copyright 2017 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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.wildfly.naming.client.remote;
import java.io.IOException;
import java.net.URI;
import java.util.Arrays;
import java.util.Hashtable;
import java.util.IdentityHashMap;
import javax.naming.Binding;
import javax.naming.CommunicationException;
import javax.naming.CompositeName;
import javax.naming.Context;
import javax.naming.InvalidNameException;
import javax.naming.Name;
import javax.naming.NameClassPair;
import javax.naming.NameNotFoundException;
import javax.naming.NamingException;
import org.jboss.remoting3.Connection;
import org.jboss.remoting3.ConnectionPeerIdentity;
import org.jboss.remoting3.Endpoint;
import org.wildfly.naming.client.AbstractFederatingContext;
import org.wildfly.naming.client.CloseableNamingEnumeration;
import org.wildfly.naming.client.ExhaustedDestinationsException;
import org.wildfly.naming.client.NamingOperation;
import org.wildfly.naming.client.ProviderEnvironment;
import org.wildfly.naming.client.RetryContext;
import org.wildfly.naming.client._private.Messages;
import org.wildfly.naming.client.store.RelativeFederatingContext;
import org.wildfly.naming.client.util.FastHashtable;
import org.wildfly.naming.client.util.NamingUtils;
import org.xnio.IoFuture;
import org.xnio.OptionMap;
/**
* The remote-server root context.
*
* @author David M. Lloyd
*/
final class RemoteContext extends AbstractFederatingContext {
private static final int MAX_NOT_FOUND_RETRY = 8;
private final RemoteNamingProvider provider;
private final String scheme;
RemoteContext(final RemoteNamingProvider provider, final String scheme, final Hashtable env) throws CommunicationException {
super(FastHashtable.of(env));
this.provider = provider;
this.scheme = scheme;
}
RemoteClientTransport getRemoteTransport(ConnectionPeerIdentity peerIdentity) throws NamingException {
final Endpoint endpoint = provider.getEndpoint();
if (endpoint == null) {
throw Messages.log.noRemotingEndpoint();
}
try {
final Connection connection = peerIdentity.getConnection();
final IoFuture future = RemoteClientTransport.SERVICE_HANDLE.getClientService(connection, OptionMap.EMPTY);
try {
return future.getInterruptibly();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
future.cancel();
throw Messages.log.operationInterrupted();
}
} catch (IOException e) {
if (e.getCause() instanceof NamingException) {
throw (NamingException) e.getCause();
}
throw Messages.log.connectFailed(e);
}
}
private boolean canRetry(ProviderEnvironment environment) {
return environment.getProviderUris().size() > 1;
}
private R performWithRetry(NamingOperation function, ProviderEnvironment environment, RetryContext context, Name name, T param) throws NamingException {
// Directly pass-through single provider executions
if (context == null) {
return provider.performExceptionAction(function, context, name, param);
}
for (int notFound = 0;;) {
try {
R result = provider.performExceptionAction(function, context, name, param);
environment.dropFromBlocklist(context.currentDestination());
return result;
} catch (NameNotFoundException e) {
if (notFound++ > MAX_NOT_FOUND_RETRY) {
Messages.log.tracef("Maximum name not found attempts exceeded,");
throw e;
}
URI location = context.currentDestination();
Messages.log.tracef("Provider (%s) did not have name \"%s\" (or a portion), retrying other nodes", location, name);
// Always throw NameNotFoundException, unless we find it on another host
context.addExplicitFailure(e);
context.addTransientFail(location);
} catch (ExhaustedDestinationsException e) {
throw e;
} catch (CommunicationException t) {
URI location = context.currentDestination();
Messages.log.tracef(t, "Communication error while contacting %s", location);
updateBlocklist(environment, context, t);
context.addFailure(injectDestination(t, location));
} catch (NamingException e) {
// All other naming exceptions are legit errors
environment.dropFromBlocklist(context.currentDestination());
throw e;
} catch (Throwable t) {
// Don't blocklist generic throwables since it may indicate a client bug
URI location = context.currentDestination();
Messages.log.tracef(t, "Unexpected throwable while contacting %s", location);
context.addTransientFail(location);
context.addFailure(injectDestination(t, location));
}
}
}
private static Throwable injectDestination(Throwable t, URI destination) {
StackTraceElement[] stackTrace = new StackTraceElement[5];
System.arraycopy(t.getStackTrace(), 0, stackTrace, 1, 4);
stackTrace[0] = new StackTraceElement("", "..use of destination...", destination.toString(), -1);
t.setStackTrace(stackTrace);
IdentityHashMap encountered = new IdentityHashMap<>(3);
encountered.put(t, t);
Throwable cause = t.getCause();
while (cause != null && encountered.get(cause) == null) {
encountered.put(cause, cause);
cause.setStackTrace(Arrays.copyOfRange(cause.getStackTrace(), 0, 5));
cause = cause.getCause();
}
return t;
}
private void updateBlocklist(ProviderEnvironment environment, RetryContext context, Throwable t) {
URI location = context.currentDestination();
Messages.log.tracef(t, "Provider (%s) failed, blocklisting and retrying", location);
environment.updateBlocklist(location);
}
Name getRealName(Name name) throws InvalidNameException {
// this could go away after WFNC-20
if (scheme == null) {
return name;
}
if (name.isEmpty()) {
return new CompositeName(scheme + ":");
}
final String part0 = name.get(0);
final Name clone = (Name) name.clone();
clone.remove(0);
clone.add(0, scheme + ":" + part0);
return clone;
}
protected Object lookupNative(final Name name) throws NamingException {
Name realName = getRealName(name);
if (realName.isEmpty()) {
return new RemoteContext(provider, scheme, getEnvironment());
}
ProviderEnvironment environment = provider.getProviderEnvironment();
final RetryContext context = canRetry(environment) ? new RetryContext() : null;
return performWithRetry((context_, name_, ignored) -> {
final ConnectionPeerIdentity peerIdentity = provider.getPeerIdentityForNamingUsingRetry(context_);
return getRemoteTransport(peerIdentity).lookup(this, name_, peerIdentity, false);
}, environment, context, realName, null);
}
protected Object lookupLinkNative(final Name name) throws NamingException {
Name realName = getRealName(name);
if (realName.isEmpty()) {
return new RemoteContext(provider, scheme, getEnvironment());
}
ProviderEnvironment environment = provider.getProviderEnvironment();
final RetryContext context = canRetry(environment) ? new RetryContext() : null;
return performWithRetry((context_, name_, ignored) -> {
final ConnectionPeerIdentity peerIdentity = provider.getPeerIdentityForNamingUsingRetry(context_);
return getRemoteTransport(peerIdentity).lookup(this, name_, peerIdentity, true);
}, environment, context, realName, null);
}
protected void bindNative(final Name name, final Object obj) throws NamingException {
Name realName = getRealName(name);
ProviderEnvironment environment = provider.getProviderEnvironment();
final RetryContext context = canRetry(environment) ? new RetryContext() : null;
performWithRetry((context_, name_, obj_) -> {
final ConnectionPeerIdentity peerIdentity = provider.getPeerIdentityForNamingUsingRetry(context_);
getRemoteTransport(peerIdentity).bind(name_, obj_, peerIdentity, false);
return null;
}, environment, context, realName, obj);
}
protected void rebindNative(final Name name, final Object obj) throws NamingException {
Name realName = getRealName(name);
ProviderEnvironment environment = provider.getProviderEnvironment();
final RetryContext context = canRetry(environment) ? new RetryContext() : null;
performWithRetry((context_, name_, obj_) -> {
final ConnectionPeerIdentity peerIdentity = provider.getPeerIdentityForNamingUsingRetry(context_);
getRemoteTransport(peerIdentity).bind(name_, obj_, peerIdentity, true);
return null;
}, environment, context, realName, obj);
}
protected void unbindNative(final Name name) throws NamingException {
Name realName = getRealName(name);
ProviderEnvironment environment = provider.getProviderEnvironment();
final RetryContext context = canRetry(environment) ? new RetryContext() : null;
performWithRetry((context_, name_, ignored) -> {
final ConnectionPeerIdentity peerIdentity = provider.getPeerIdentityForNamingUsingRetry(context_);
getRemoteTransport(peerIdentity).unbind(name_, peerIdentity);
return null;
}, environment, context, realName, null);
}
protected void renameNative(final Name oldName, final Name newName) throws NamingException {
Name realOldName = getRealName(oldName);
Name realNewName = getRealName(newName);
ProviderEnvironment environment = provider.getProviderEnvironment();
final RetryContext context = canRetry(environment) ? new RetryContext() : null;
performWithRetry((context_, oldName_, newName_) -> {
final ConnectionPeerIdentity peerIdentity = provider.getPeerIdentityForNamingUsingRetry(context_);
getRemoteTransport(peerIdentity).rename(oldName_, newName_, peerIdentity);
return null;
}, environment, context, realOldName, realNewName);
}
protected CloseableNamingEnumeration listNative(final Name name) throws NamingException {
Name realName = getRealName(name);
ProviderEnvironment environment = provider.getProviderEnvironment();
final RetryContext context = canRetry(environment) ? new RetryContext() : null;
return performWithRetry((context_, name_, ignored) -> {
final ConnectionPeerIdentity peerIdentity = provider.getPeerIdentityForNamingUsingRetry(context_);
return getRemoteTransport(peerIdentity).list(name_, peerIdentity);
}, environment, context, realName, null);
}
protected CloseableNamingEnumeration listBindingsNative(final Name name) throws NamingException {
Name realName = getRealName(name);
ProviderEnvironment environment = provider.getProviderEnvironment();
final RetryContext context = canRetry(environment) ? new RetryContext() : null;
return performWithRetry((context_, name_, ignored) -> {
final ConnectionPeerIdentity peerIdentity = provider.getPeerIdentityForNamingUsingRetry(context_);
return getRemoteTransport(peerIdentity).listBindings(name_, this, peerIdentity);
}, environment, context, realName, null);
}
protected void destroySubcontextNative(final Name name) throws NamingException {
Name realName = getRealName(name);
ProviderEnvironment environment = provider.getProviderEnvironment();
final RetryContext context = canRetry(environment) ? new RetryContext() : null;
performWithRetry((context_, name_, ignored) -> {
final ConnectionPeerIdentity peerIdentity = provider.getPeerIdentityForNamingUsingRetry(context_);
getRemoteTransport(peerIdentity).destroySubcontext(name_, peerIdentity);
return null;
}, environment, context, realName, null);
}
protected Context createSubcontextNative(final Name name) throws NamingException {
Name realName = getRealName(name);
ProviderEnvironment environment = provider.getProviderEnvironment();
final RetryContext context = canRetry(environment) ? new RetryContext() : null;
return performWithRetry((context_, name_, ignored) -> {
final ConnectionPeerIdentity peerIdentity = provider.getPeerIdentityForNamingUsingRetry(context_);
final CompositeName compositeName = NamingUtils.toCompositeName(name_);
getRemoteTransport(peerIdentity).createSubcontext(compositeName, peerIdentity);
return new RelativeFederatingContext(getEnvironment(), this, compositeName);
}, environment, context, realName, null);
}
public void close() {
// no operation
}
public String getNameInNamespace() throws NamingException {
return "";
}
}
