com.palantir.atlasdb.http.v2.UnknownRemoteDebuggingProxy Maven / Gradle / Ivy

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/*
 * (c) Copyright 2022 Palantir Technologies Inc. All rights reserved.
 *
 * 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 com.palantir.atlasdb.http.v2;

import com.google.common.reflect.AbstractInvocationHandler;
import com.google.common.util.concurrent.RateLimiter;
import com.palantir.conjure.java.api.errors.UnknownRemoteException;
import com.palantir.logsafe.SafeArg;
import com.palantir.logsafe.logger.SafeLogger;
import com.palantir.logsafe.logger.SafeLoggerFactory;
import com.palantir.refreshable.Refreshable;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

@SuppressWarnings("ProxyNonConstantType")
public final class UnknownRemoteDebuggingProxy extends AbstractInvocationHandler {
    private static final SafeLogger log = SafeLoggerFactory.get(UnknownRemoteDebuggingProxy.class);
    private final Refreshable> safeLoggableRefreshable;
    private final RateLimiter rateLimiter;
    private final V delegate;

    private UnknownRemoteDebuggingProxy(Refreshable> safeLoggableRefreshable, V delegate) {
        this.safeLoggableRefreshable = safeLoggableRefreshable;
        this.delegate = delegate;
        this.rateLimiter = RateLimiter.create(0.05);
    }

    @Override
    protected Object handleInvocation(Object proxy, Method method, Object[] args) throws Throwable {
        try {
            return method.invoke(delegate, args);
        } catch (InvocationTargetException e) {
            Throwable cause = e.getCause();
            if (cause instanceof UnknownRemoteException && rateLimiter.tryAcquire()) {
                log.warn(
                        "Encountered UnknownRemoteException; logging current state of refreshable",
                        safeLoggableRefreshable.get(),
                        cause);
            }
            throw cause;
        }
    }

    public static  U newProxyInstance(
            Class interfaceClass, Refreshable> safeLoggableRefreshable, U delegate) {
        UnknownRemoteDebuggingProxy proxy = new UnknownRemoteDebuggingProxy<>(safeLoggableRefreshable, delegate);

        return (U) Proxy.newProxyInstance(interfaceClass.getClassLoader(), new Class[] {interfaceClass}, proxy);
    }
}