com.telenordigital.sms.smpp.OutboundPduHandler Maven / Gradle / Ivy

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A smpp client library implementing SMPP specification from https://smpp.org.

There is a newer version: 1.18

package com.telenordigital.sms.smpp;

/*-
 * #%L
 * sms-smpp
 * %%
 * Copyright (C) 2022 Telenor Digital
 * %%
 * 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.
 * #L%
 */

import com.telenordigital.sms.smpp.pdu.ResponsePdu;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToMessageCodec;
import java.lang.invoke.MethodHandles;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

class OutboundPduHandler extends MessageToMessageCodec> {

  private static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());

  private final int windowSize;
  private final int timeoutSeconds;

  private final Map> window = new LinkedHashMap<>();
  private CompletableFuture drainingFuture;

  OutboundPduHandler(final int windowSize, final int timeoutSeconds) {
    if (windowSize < 1) {
      throw new IllegalArgumentException("Window size must be > 0");
    }

    this.windowSize = windowSize;
    this.timeoutSeconds = timeoutSeconds;
  }

  private void removeExpired(final ChannelHandlerContext ctx) {
    window
        .entrySet()
        .removeIf(
            entry -> {
              final var rr = entry.getValue();
              final var age = System.currentTimeMillis() - rr.startedTimeMillis();

              if (age > timeoutSeconds * 1_000L) {
                LOG.warn("Entry expired: {}", entry);
                rr.completeExceptionally(
                    ctx, "Request expired. No response received in " + timeoutSeconds + "s");
                return true;
              }

              return false;
            });
  }

  int getOpenWindowSlots() {
    // this method will be called on a different thread. it is used only for monitoring purpose
    return windowSize - window.size();
  }

  @Override
  protected void encode(
      final ChannelHandlerContext ctx,
      final RequestResponse msg,
      final List