com.uber.jaeger.senders.ThriftSender.java Source code

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Here is the source code for com.uber.jaeger.senders.ThriftSender.java

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/*
 * Copyright (c) 2016, Uber Technologies, Inc
 *
 * 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.uber.jaeger.senders;

import com.uber.jaeger.Span;
import com.uber.jaeger.exceptions.SenderException;
import com.uber.jaeger.reporters.protocols.JaegerThriftSpanConverter;
import com.uber.jaeger.reporters.protocols.ThriftUdpTransport;
import com.uber.jaeger.thriftjava.Process;
import java.util.ArrayList;
import java.util.List;
import lombok.ToString;
import org.apache.thrift.TBase;
import org.apache.thrift.TException;
import org.apache.thrift.protocol.TProtocolFactory;
import org.apache.thrift.transport.AutoExpandingBufferWriteTransport;

@ToString(exclude = { "spanBuffer", "memoryTransport" })
public abstract class ThriftSender implements Sender {
    static final int EMIT_BATCH_OVERHEAD = 33;

    private Process process;
    private int processBytesSize;
    private List<com.uber.jaeger.thriftjava.Span> spanBuffer;
    private int byteBufferSize;
    private AutoExpandingBufferWriteTransport memoryTransport;

    protected final TProtocolFactory protocolFactory;
    private final int maxSpanBytes;

    public ThriftSender(TProtocolFactory protocolFactory, int maxPacketSize) {
        this.protocolFactory = protocolFactory;

        if (maxPacketSize == 0) {
            maxPacketSize = ThriftUdpTransport.MAX_PACKET_SIZE;
        }

        memoryTransport = new AutoExpandingBufferWriteTransport(maxPacketSize, 2);
        maxSpanBytes = maxPacketSize - EMIT_BATCH_OVERHEAD;
        spanBuffer = new ArrayList<com.uber.jaeger.thriftjava.Span>();
    }

    public abstract void send(Process process, List<com.uber.jaeger.thriftjava.Span> spans) throws TException;

    @Override
    public int append(Span span) throws SenderException {
        if (process == null) {
            process = new Process(span.getTracer().getServiceName());
            process.setTags(JaegerThriftSpanConverter.buildTags(span.getTracer().tags()));
            processBytesSize = getSizeOfSerializedThrift(process);
            byteBufferSize += processBytesSize;
        }

        com.uber.jaeger.thriftjava.Span thriftSpan = JaegerThriftSpanConverter.convertSpan(span);
        int spanSize = getSizeOfSerializedThrift(thriftSpan);
        if (spanSize > maxSpanBytes) {
            throw new SenderException(
                    String.format("ThriftSender received a span that was too large, size = %d, max = %d", spanSize,
                            maxSpanBytes),
                    null, 1);
        }

        byteBufferSize += spanSize;
        if (byteBufferSize <= maxSpanBytes) {
            spanBuffer.add(thriftSpan);
            if (byteBufferSize < maxSpanBytes) {
                return 0;
            }
            return flush();
        }

        int n;
        try {
            n = flush();
        } catch (SenderException e) {
            // +1 for the span not submitted in the buffer above
            throw new SenderException(e.getMessage(), e.getCause(), e.getDroppedSpanCount() + 1);
        }

        spanBuffer.add(thriftSpan);
        byteBufferSize = processBytesSize + spanSize;
        return n;
    }

    @Override
    public int flush() throws SenderException {
        if (spanBuffer.isEmpty()) {
            return 0;
        }

        int n = spanBuffer.size();
        try {
            send(process, spanBuffer);
        } catch (TException e) {
            throw new SenderException("Failed to flush spans.", e, n);
        } finally {
            spanBuffer.clear();
            byteBufferSize = processBytesSize;
        }
        return n;
    }

    @Override
    public int close() throws SenderException {
        return flush();
    }

    int getSizeOfSerializedThrift(TBase thriftBase) throws SenderException {
        memoryTransport.reset();
        try {
            thriftBase.write(protocolFactory.getProtocol(memoryTransport));
        } catch (TException e) {
            throw new SenderException("ThriftSender failed writing to memory buffer.", e, 1);
        }
        return memoryTransport.getPos();
    }
}