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/*
* 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;
import static org.wildfly.naming.client.ProviderEnvironment.TIME_MASK;
import java.lang.reflect.UndeclaredThrowableException;
import java.net.URI;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ThreadLocalRandom;
import java.util.function.BiFunction;
import javax.naming.Name;
import javax.naming.NamingException;
import org.wildfly.common.function.ExceptionBiFunction;
import org.wildfly.naming.client._private.Messages;
import org.wildfly.security.auth.client.PeerIdentity;
/**
* A provider for a single naming scheme. Each implementation of a naming provider has different characteristics.
*
* @author David M. Lloyd
*/
public interface NamingProvider extends AutoCloseable {
/**
* Get the provider environment.
*
* @return the provider environment (must not be {@code null})
*/
ProviderEnvironment getProviderEnvironment();
/**
* Get a peer identity to use for context operations. The identity may be fixed or it may vary, depending on the context configuration.
* If the provider has multiple locations, a location is randomly selected.
*
* @return the peer identity to use (must not be {@code null})
* @throws NamingException if connecting, authenticating, or re-authenticating the peer failed
*/
default PeerIdentity getPeerIdentityForNaming() throws NamingException {
return getPeerIdentityForNamingUsingRetry(null);
}
/**
* Get a peer identity to use for context operations, retrying on failure.
* The identity may be fixed or it may vary, depending on the context
* configuration. If the provider has multiple locations, a location is
* randomly selected. If the retry context is null, a retry will not occur.
*
* @param context the retry context for storing state required when retrying
* @return the peer identity to use (must not be {@code null})
* @throws NamingException if connecting, authenticating, or
* re-authenticating the peer failed
*/
default PeerIdentity getPeerIdentityForNamingUsingRetry(RetryContext context) throws NamingException {
final ProviderEnvironment environment = getProviderEnvironment();
final ConcurrentMap blackList = environment.getBlackList();
List locations = environment.getProviderUris();
if (context != null && (blackList.size() > 0 || context.transientFailCount() > 0)) {
long time = System.currentTimeMillis();
List updated = new ArrayList<>(locations.size());
for (URI location : locations) {
Long timeout = blackList.get(location);
if ((timeout == null || time >= (timeout & TIME_MASK)) && !context.hasTransientlyFailed(location)) {
updated.add(location);
}
}
locations = updated;
}
URI location = null;
if (locations.size() < 1) {
throwNoMoreDestinationsException(context);
} else if (locations.size() == 1) {
location = locations.get(0);
} else {
location = locations.get(ThreadLocalRandom.current().nextInt(locations.size()));
}
if (context != null) {
context.setCurrentDestination(location);
}
return getPeerIdentityForNaming(location);
}
/**
* Throws either an ExhaustedDestinationsException
* utilizing the information passed in the specified
* RetryContext, or an explicit exception mandated by the
* context.
*
* @param context the current retry context of this invocation
* @throws ExhaustedDestinationsException if no explicit exception is specified
* @throws NamingException if explicity required
* @throws RuntimeException if explicity required
*/
default void throwNoMoreDestinationsException(RetryContext context) throws NamingException {
if (context == null) {
throw Messages.log.noMoreDestinations();
}
if (context.hasExplicitFailure()) {
Throwable throwable = context.getFailures().get(0);
try {
throw throwable;
} catch (NamingException | RuntimeException | Error e) {
throw e;
} catch (Throwable t) {
throw new UndeclaredThrowableException(t);
}
}
final ProviderEnvironment env = getProviderEnvironment();
int blacklisted = env.getBlackList().size();
int transientlyFailed = context.transientFailCount();
ExhaustedDestinationsException exception = Messages.log.noMoreDestinations(blacklisted, transientlyFailed);
for (Throwable failure : context.getFailures()) {
exception.addSuppressed(failure);
}
// Remove this call
StackTraceElement[] stackTrace = exception.getStackTrace();
exception.setStackTrace(Arrays.copyOfRange(stackTrace, 1, stackTrace.length - 1));
throw exception;
}
/**
* Get the peer identity to use for context operations for the specified location. The identity may be fixed or it may vary, depending on the context configuration.
* The location should be from the list returned by {@link ProviderEnvironment#getProviderUris()}.
*
* @param location a location from {@link ProviderEnvironment#getProviderUris()} (must not be {@code null})
* @return the peer identity to use (must not be {@code null})
* @throws NamingException if connecting, authenticating, or re-authenticating the peer failed
*/
PeerIdentity getPeerIdentityForNaming(URI location) throws NamingException;
/**
* Get the current naming provider being used for the current deserialization operation.
*
* @return the current naming provider, or {@code null} if no provider-related deserialization is occurring
*/
static NamingProvider getCurrentNamingProvider() {
return CurrentNamingProvider.getCurrent();
}
/**
* Perform an action under the current naming provider.
*
* @param function the function to apply (must not be {@code null})
* @param arg1 the first argument
* @param arg2 the second argument
* @param the first argument type
* @param the second argument type
* @param the function return type
* @return the function return value
*/
default R performAction(BiFunction function, T arg1, U arg2) {
final NamingProvider old = CurrentNamingProvider.getAndSetCurrent(this);
try {
return function.apply(arg1, arg2);
} finally {
CurrentNamingProvider.setCurrent(old);
}
}
/**
* Perform an action under the current naming provider.
*
* @param function the function to apply (must not be {@code null})
* @param arg1 the first argument
* @param arg2 the second argument
* @param the first argument type
* @param the second argument type
* @param the function return type
* @param the function exception type
* @return the function return value
* @throws E if the function throws an exception of the given type
*/
default R performExceptionAction(ExceptionBiFunction function, T arg1, U arg2) throws E {
final NamingProvider old = CurrentNamingProvider.getAndSetCurrent(this);
try {
return function.apply(arg1, arg2);
} finally {
CurrentNamingProvider.setCurrent(old);
}
}
/**
* Perform an action under the current naming provider.
*
* @param function the function to apply (must not be {@code null})
* @param the first argument type
* @param the function return type
* @return the function return value
*/
default R performExceptionAction(NamingOperation function, RetryContext contextOrNull, Name name, T param) throws NamingException {
final NamingProvider old = CurrentNamingProvider.getAndSetCurrent(this);
try {
return function.apply(contextOrNull, name, param);
} finally {
CurrentNamingProvider.setCurrent(old);
}
}
/**
* Close the provider. This method is called when the corresponding {@code InitialContext} is closed. This method
* should be idempotent.
*
* @throws NamingException if an error occurred while closing this provider
*/
default void close() throws NamingException {
}
}
