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Bare minimum core library needed to sending metrics to SignalFx from Java clients

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//
//  ========================================================================
//  Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package com.signalfx.shaded.jetty.websocket.common.events.annotated;

import java.io.InputStream;
import java.io.Reader;
import java.lang.reflect.Method;

import com.signalfx.shaded.jetty.websocket.api.Session;

/**
 * Simple CallableMethod that manages the optional {@link Session} argument
 */
public class OptionalSessionCallableMethod extends CallableMethod
{
    private final boolean wantsSession;
    private final boolean streaming;

    public OptionalSessionCallableMethod(Class pojo, Method method)
    {
        super(pojo, method);

        boolean foundConnection = false;
        boolean foundStreaming = false;

        if (paramTypes != null)
        {
            for (Class paramType : paramTypes)
            {
                if (Session.class.isAssignableFrom(paramType))
                {
                    foundConnection = true;
                }
                if (Reader.class.isAssignableFrom(paramType) || InputStream.class.isAssignableFrom(paramType))
                {
                    foundStreaming = true;
                }
            }
        }

        this.wantsSession = foundConnection;
        this.streaming = foundStreaming;
    }

    public void call(Object obj, Session connection, Object... args)
    {
        if (wantsSession)
        {
            Object[] fullArgs = new Object[args.length + 1];
            fullArgs[0] = connection;
            System.arraycopy(args, 0, fullArgs, 1, args.length);
            call(obj, fullArgs);
        }
        else
        {
            call(obj, args);
        }
    }

    public boolean isSessionAware()
    {
        return wantsSession;
    }

    public boolean isStreaming()
    {
        return streaming;
    }

    @Override
    public String toString()
    {
        return String.format("%s[pojo=%s,method=%s,wantsSession=%b,streaming=%s]",
            this.getClass().getSimpleName(),
            pojo.getName(),
            method.toGenericString(),
            wantsSession,
            streaming);
    }
}