#18744

pending completion

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Revert "Release v1.57.0 (#10417)" (#10419)

This reverts commit d23e39e64.

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/../core/src/main/java/io/grpc/internal/DelayedClientTransport.java

/*
 * Copyright 2015 The gRPC Authors
 *
 * 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 io.grpc.internal;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;
import io.grpc.CallOptions;
import io.grpc.ClientStreamTracer;
import io.grpc.Context;
import io.grpc.InternalChannelz.SocketStats;
import io.grpc.InternalLogId;
import io.grpc.LoadBalancer.PickResult;
import io.grpc.LoadBalancer.PickSubchannelArgs;
import io.grpc.LoadBalancer.SubchannelPicker;
import io.grpc.Metadata;
import io.grpc.MethodDescriptor;
import io.grpc.Status;
import io.grpc.SynchronizationContext;
import io.grpc.internal.ClientStreamListener.RpcProgress;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.concurrent.Executor;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.GuardedBy;

/**
 * A client transport that queues requests before a real transport is available. When {@link
 * #reprocess} is called, this class applies the provided {@link SubchannelPicker} to pick a
 * transport for each pending stream.
 *
 * <p>This transport owns every stream that it has created until a real transport has been picked
 * for that stream, at which point the ownership of the stream is transferred to the real transport,
 * thus the delayed transport stops owning the stream.
 */
final class DelayedClientTransport implements ManagedClientTransport {
  // lazily allocated, since it is infrequently used.
  private final InternalLogId logId =
      InternalLogId.allocate(DelayedClientTransport.class, /*details=*/ null);

  private final Object lock = new Object();

  private final Executor defaultAppExecutor;
  private final SynchronizationContext syncContext;

  private Runnable reportTransportInUse;
  private Runnable reportTransportNotInUse;
  private Runnable reportTransportTerminated;
  private Listener listener;

  @Nonnull
  @GuardedBy("lock")
  private Collection<PendingStream> pendingStreams = new LinkedHashSet<>();

  /**
   * When {@code shutdownStatus != null && !hasPendingStreams()}, then the transport is considered
   * terminated.
   */
  @GuardedBy("lock")
  private Status shutdownStatus;

  /**
   * The last picker that {@link #reprocess} has used. May be set to null when the channel has moved
   * to idle.
   */
  @GuardedBy("lock")
  @Nullable
  private SubchannelPicker lastPicker;

  @GuardedBy("lock")
  private long lastPickerVersion;

  /**
   * Creates a new delayed transport.
   *
   * @param defaultAppExecutor pending streams will create real streams and run bufferred operations
   *        in an application executor, which will be this executor, unless there is on provided in
   *        {@link CallOptions}.
   * @param syncContext all listener callbacks of the delayed transport will be run from this
   *        SynchronizationContext.
   */
  DelayedClientTransport(Executor defaultAppExecutor, SynchronizationContext syncContext) {
    this.defaultAppExecutor = defaultAppExecutor;
    this.syncContext = syncContext;
  }

  @Override
  public final Runnable start(final Listener listener) {
    this.listener = listener;
    reportTransportInUse = new Runnable() {
        @Override
        public void run() {
          listener.transportInUse(true);
        }
      };
    reportTransportNotInUse = new Runnable() {
        @Override
        public void run() {
          listener.transportInUse(false);
        }
      };
    reportTransportTerminated = new Runnable() {
        @Override
        public void run() {
          listener.transportTerminated();
        }
      };
    return null;
  }

  /**
   * If a {@link SubchannelPicker} is being, or has been provided via {@link #reprocess}, the last
   * picker will be consulted.
   *
   * <p>Otherwise, if the delayed transport is not shutdown, then a {@link PendingStream} is
   * returned; if the transport is shutdown, then a {@link FailingClientStream} is returned.
   */
  @Override
  public final ClientStream newStream(
      MethodDescriptor<?, ?> method, Metadata headers, CallOptions callOptions,
      ClientStreamTracer[] tracers) {
    try {
      PickSubchannelArgs args = new PickSubchannelArgsImpl(method, headers, callOptions);
      SubchannelPicker picker = null;
      long pickerVersion = -1;
      while (true) {
        synchronized (lock) {
          if (shutdownStatus != null) {
            return new FailingClientStream(shutdownStatus, tracers);
          }
          if (lastPicker == null) {
            return createPendingStream(args, tracers);
          }
          // Check for second time through the loop, and whether anything changed
          if (picker != null && pickerVersion == lastPickerVersion) {
            return createPendingStream(args, tracers);
          }
          picker = lastPicker;
          pickerVersion = lastPickerVersion;
        }
        PickResult pickResult = picker.pickSubchannel(args);
        ClientTransport transport = GrpcUtil.getTransportFromPickResult(pickResult,
            callOptions.isWaitForReady());
        if (transport != null) {
          return transport.newStream(
              args.getMethodDescriptor(), args.getHeaders(), args.getCallOptions(),
              tracers);
        }
        // This picker's conclusion is "buffer".  If there hasn't been a newer picker set (possible
        // race with reprocess()), we will buffer it.  Otherwise, will try with the new picker.
      }
    } finally {
      syncContext.drain();
    }
  }

  /**
   * Caller must call {@code syncContext.drain()} outside of lock because this method may
   * schedule tasks on syncContext.
   */
  @GuardedBy("lock")
  private PendingStream createPendingStream(
      PickSubchannelArgs args, ClientStreamTracer[] tracers) {
    PendingStream pendingStream = new PendingStream(args, tracers);
    pendingStreams.add(pendingStream);
    if (getPendingStreamsCount() == 1) {
      syncContext.executeLater(reportTransportInUse);
    }
    for (ClientStreamTracer streamTracer : tracers) {
      streamTracer.createPendingStream();
    }
    return pendingStream;
  }

  @Override
  public final void ping(final PingCallback callback, Executor executor) {
    throw new UnsupportedOperationException("This method is not expected to be called");
  }

  @Override
  public ListenableFuture<SocketStats> getStats() {
    SettableFuture<SocketStats> ret = SettableFuture.create();
    ret.set(null);
    return ret;
  }

  /**
   * Prevents creating any new streams.  Buffered streams are not failed and may still proceed
   * when {@link #reprocess} is called.  The delayed transport will be terminated when there is no
   * more buffered streams.
   */
  @Override
  public final void shutdown(final Status status) {
    synchronized (lock) {
      if (shutdownStatus != null) {
        return;
      }
      shutdownStatus = status;
      syncContext.executeLater(new Runnable() {
          @Override
          public void run() {
            listener.transportShutdown(status);
          }
        });
      if (!hasPendingStreams() && reportTransportTerminated != null) {
        syncContext.executeLater(reportTransportTerminated);
        reportTransportTerminated = null;
      }
    }
    syncContext.drain();
  }

  /**
   * Shuts down this transport and cancels all streams that it owns, hence immediately terminates
   * this transport.
   */
  @Override
  public final void shutdownNow(Status status) {
    shutdown(status);
    Collection<PendingStream> savedPendingStreams;
    Runnable savedReportTransportTerminated;
    synchronized (lock) {
      savedPendingStreams = pendingStreams;
      savedReportTransportTerminated = reportTransportTerminated;
      reportTransportTerminated = null;
      if (!pendingStreams.isEmpty()) {
        pendingStreams = Collections.emptyList();
      }
    }
    if (savedReportTransportTerminated != null) {
      for (PendingStream stream : savedPendingStreams) {
        Runnable runnable = stream.setStream(
            new FailingClientStream(status, RpcProgress.REFUSED, stream.tracers));
        if (runnable != null) {
          // Drain in-line instead of using an executor as failing stream just throws everything
          // away. This is essentially the same behavior as DelayedStream.cancel() but can be done
          // before stream.start().
          runnable.run();
        }
      }
      syncContext.execute(savedReportTransportTerminated);
    }
    // If savedReportTransportTerminated == null, transportTerminated() has already been called in
    // shutdown().
  }

  public final boolean hasPendingStreams() {
    synchronized (lock) {
      return !pendingStreams.isEmpty();
    }
  }

  @VisibleForTesting
  final int getPendingStreamsCount() {
    synchronized (lock) {
      return pendingStreams.size();
    }
  }

  /**
   * Use the picker to try picking a transport for every pending stream, proceed the stream if the
   * pick is successful, otherwise keep it pending.
   *
   * <p>This method may be called concurrently with {@code newStream()}, and it's safe.  All pending
   * streams will be served by the latest picker (if a same picker is given more than once, they are
   * considered different pickers) as soon as possible.
   *
   * <p>This method <strong>must not</strong> be called concurrently with itself.
   */
  final void reprocess(@Nullable SubchannelPicker picker) {
    ArrayList<PendingStream> toProcess;
    synchronized (lock) {
      lastPicker = picker;
      lastPickerVersion++;
      if (picker == null || !hasPendingStreams()) {
        return;
      }
      toProcess = new ArrayList<>(pendingStreams);
    }
    ArrayList<PendingStream> toRemove = new ArrayList<>();

    for (final PendingStream stream : toProcess) {
      PickResult pickResult = picker.pickSubchannel(stream.args);
      CallOptions callOptions = stream.args.getCallOptions();
      final ClientTransport transport = GrpcUtil.getTransportFromPickResult(pickResult,
          callOptions.isWaitForReady());
      if (transport != null) {
        Executor executor = defaultAppExecutor;
        // createRealStream may be expensive. It will start real streams on the transport. If
        // there are pending requests, they will be serialized too, which may be expensive. Since
        // we are now on transport thread, we need to offload the work to an executor.
        if (callOptions.getExecutor() != null) {
          executor = callOptions.getExecutor();
        }
        Runnable runnable = stream.createRealStream(transport);
        if (runnable != null) {
          executor.execute(runnable);
        }
        toRemove.add(stream);
      }  // else: stay pending
    }

    synchronized (lock) {
      // Between this synchronized and the previous one:
      //   - Streams may have been cancelled, which may turn pendingStreams into emptiness.
      //   - shutdown() may be called, which may turn pendingStreams into null.
      if (!hasPendingStreams()) {
        return;
      }
      pendingStreams.removeAll(toRemove);
      // Because delayed transport is long-lived, we take this opportunity to down-size the
      // hashmap.
      if (pendingStreams.isEmpty()) {
        pendingStreams = new LinkedHashSet<>();
      }
      if (!hasPendingStreams()) {
        // There may be a brief gap between delayed transport clearing in-use state, and first real
        // transport starting streams and setting in-use state.  During the gap the whole channel's
        // in-use state may be false. However, it shouldn't cause spurious switching to idleness
        // (which would shutdown the transports and LoadBalancer) because the gap should be shorter
        // than IDLE_MODE_DEFAULT_TIMEOUT_MILLIS (1 second).
        syncContext.executeLater(reportTransportNotInUse);
        if (shutdownStatus != null && reportTransportTerminated != null) {
          syncContext.executeLater(reportTransportTerminated);
          reportTransportTerminated = null;
        }
      }
    }
    syncContext.drain();
  }

  @Override
  public InternalLogId getLogId() {
    return logId;
  }

  private class PendingStream extends DelayedStream {
    private final PickSubchannelArgs args;
    private final Context context = Context.current();
    private final ClientStreamTracer[] tracers;

    private PendingStream(PickSubchannelArgs args, ClientStreamTracer[] tracers) {
      this.args = args;
      this.tracers = tracers;
    }

    /** Runnable may be null. */
    private Runnable createRealStream(ClientTransport transport) {
      ClientStream realStream;
      Context origContext = context.attach();
      try {
        realStream = transport.newStream(
            args.getMethodDescriptor(), args.getHeaders(), args.getCallOptions(),
            tracers);
      } finally {
        context.detach(origContext);
      }
      return setStream(realStream);
    }

    @Override
    public void cancel(Status reason) {
      super.cancel(reason);
      synchronized (lock) {
        if (reportTransportTerminated != null) {
          boolean justRemovedAnElement = pendingStreams.remove(this);
          if (!hasPendingStreams() && justRemovedAnElement) {
            syncContext.executeLater(reportTransportNotInUse);
            if (shutdownStatus != null) {
              syncContext.executeLater(reportTransportTerminated);
              reportTransportTerminated = null;
            }
          }
        }
      }
      syncContext.drain();
    }

    @Override
    protected void onEarlyCancellation(Status reason) {
      for (ClientStreamTracer tracer : tracers) {
        tracer.streamClosed(reason);
      }
    }

    @Override
    public void appendTimeoutInsight(InsightBuilder insight) {
      if (args.getCallOptions().isWaitForReady()) {
        insight.append("wait_for_ready");
      }
      super.appendTimeoutInsight(insight);
    }
  }
}

1	/*
2	* Copyright 2015 The gRPC Authors
3	*
4	* Licensed under the Apache License, Version 2.0 (the "License");
5	* you may not use this file except in compliance with the License.
6	* You may obtain a copy of the License at
7	*
8	* http://www.apache.org/licenses/LICENSE-2.0
9	*
10	* Unless required by applicable law or agreed to in writing, software
11	* distributed under the License is distributed on an "AS IS" BASIS,
12	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13	* See the License for the specific language governing permissions and
14	* limitations under the License.
15	*/
16
17	package io.grpc.internal;
18
19	import com.google.common.annotations.VisibleForTesting;
20	import com.google.common.util.concurrent.ListenableFuture;
21	import com.google.common.util.concurrent.SettableFuture;
22	import io.grpc.CallOptions;
23	import io.grpc.ClientStreamTracer;
24	import io.grpc.Context;
25	import io.grpc.InternalChannelz.SocketStats;
26	import io.grpc.InternalLogId;
27	import io.grpc.LoadBalancer.PickResult;
28	import io.grpc.LoadBalancer.PickSubchannelArgs;
29	import io.grpc.LoadBalancer.SubchannelPicker;
30	import io.grpc.Metadata;
31	import io.grpc.MethodDescriptor;
32	import io.grpc.Status;
33	import io.grpc.SynchronizationContext;
34	import io.grpc.internal.ClientStreamListener.RpcProgress;
35	import java.util.ArrayList;
36	import java.util.Collection;
37	import java.util.Collections;
38	import java.util.LinkedHashSet;
39	import java.util.concurrent.Executor;
40	import javax.annotation.Nonnull;
41	import javax.annotation.Nullable;
42	import javax.annotation.concurrent.GuardedBy;
43
44	/**
45	* A client transport that queues requests before a real transport is available. When {@link
46	* #reprocess} is called, this class applies the provided {@link SubchannelPicker} to pick a
47	* transport for each pending stream.
48	*
49	* <p>This transport owns every stream that it has created until a real transport has been picked
50	* for that stream, at which point the ownership of the stream is transferred to the real transport,
51	* thus the delayed transport stops owning the stream.
52	*/
53	final class DelayedClientTransport implements ManagedClientTransport {
54	// lazily allocated, since it is infrequently used.
55	private final InternalLogId logId =	1✔
56	InternalLogId.allocate(DelayedClientTransport.class, /details=/ null);	1✔
57
58	private final Object lock = new Object();	1✔
59
60	private final Executor defaultAppExecutor;
61	private final SynchronizationContext syncContext;
62
63	private Runnable reportTransportInUse;
64	private Runnable reportTransportNotInUse;
65	private Runnable reportTransportTerminated;
66	private Listener listener;
67
68	@Nonnull	1✔
69	@GuardedBy("lock")
70	private Collection<PendingStream> pendingStreams = new LinkedHashSet<>();
71
72	/**
73	* When {@code shutdownStatus != null && !hasPendingStreams()}, then the transport is considered
74	* terminated.
75	*/
76	@GuardedBy("lock")
77	private Status shutdownStatus;
78
79	/**
80	* The last picker that {@link #reprocess} has used. May be set to null when the channel has moved
81	* to idle.
82	*/
83	@GuardedBy("lock")
84	@Nullable
85	private SubchannelPicker lastPicker;
86
87	@GuardedBy("lock")
88	private long lastPickerVersion;
89
90	/**
91	* Creates a new delayed transport.
92	*
93	* @param defaultAppExecutor pending streams will create real streams and run bufferred operations
94	* in an application executor, which will be this executor, unless there is on provided in
95	* {@link CallOptions}.
96	* @param syncContext all listener callbacks of the delayed transport will be run from this
97	* SynchronizationContext.
98	*/
99	DelayedClientTransport(Executor defaultAppExecutor, SynchronizationContext syncContext) {	1✔
100	this.defaultAppExecutor = defaultAppExecutor;	1✔
101	this.syncContext = syncContext;	1✔
102	}	1✔
103
104	@Override
105	public final Runnable start(final Listener listener) {
106	this.listener = listener;	1✔
107	reportTransportInUse = new Runnable() {	1✔
108	@Override
109	public void run() {
110	listener.transportInUse(true);	1✔
111	}	1✔
112	};
113	reportTransportNotInUse = new Runnable() {	1✔
114	@Override
115	public void run() {
116	listener.transportInUse(false);	1✔
117	}	1✔
118	};
119	reportTransportTerminated = new Runnable() {	1✔
120	@Override
121	public void run() {
122	listener.transportTerminated();	1✔
123	}	1✔
124	};
125	return null;	1✔
126	}
127
128	/**
129	* If a {@link SubchannelPicker} is being, or has been provided via {@link #reprocess}, the last
130	* picker will be consulted.
131	*
132	* <p>Otherwise, if the delayed transport is not shutdown, then a {@link PendingStream} is
133	* returned; if the transport is shutdown, then a {@link FailingClientStream} is returned.
134	*/
135	@Override
136	public final ClientStream newStream(
137	MethodDescriptor<?, ?> method, Metadata headers, CallOptions callOptions,
138	ClientStreamTracer[] tracers) {
139	try {
140	PickSubchannelArgs args = new PickSubchannelArgsImpl(method, headers, callOptions);	1✔
141	SubchannelPicker picker = null;	1✔
142	long pickerVersion = -1;	1✔
143	while (true) {
144	synchronized (lock) {	1✔
145	if (shutdownStatus != null) {	1✔
146	return new FailingClientStream(shutdownStatus, tracers);	1✔
147	}
148	if (lastPicker == null) {	1✔
149	return createPendingStream(args, tracers);	1✔
150	}
151	// Check for second time through the loop, and whether anything changed
152	if (picker != null && pickerVersion == lastPickerVersion) {	1✔
153	return createPendingStream(args, tracers);	1✔
154	}
155	picker = lastPicker;	1✔
156	pickerVersion = lastPickerVersion;	1✔
157	}	1✔
158	PickResult pickResult = picker.pickSubchannel(args);	1✔
159	ClientTransport transport = GrpcUtil.getTransportFromPickResult(pickResult,	1✔
160	callOptions.isWaitForReady());	1✔
161	if (transport != null) {	1✔
162	return transport.newStream(	1✔
163	args.getMethodDescriptor(), args.getHeaders(), args.getCallOptions(),	1✔
164	tracers);
165	}
166	// This picker's conclusion is "buffer". If there hasn't been a newer picker set (possible
167	// race with reprocess()), we will buffer it. Otherwise, will try with the new picker.
168	}	1✔
169	} finally {
170	syncContext.drain();	1✔
171	}
172	}
173
174	/**
175	* Caller must call {@code syncContext.drain()} outside of lock because this method may
176	* schedule tasks on syncContext.
177	*/
178	@GuardedBy("lock")
179	private PendingStream createPendingStream(
180	PickSubchannelArgs args, ClientStreamTracer[] tracers) {
181	PendingStream pendingStream = new PendingStream(args, tracers);	1✔
182	pendingStreams.add(pendingStream);	1✔
183	if (getPendingStreamsCount() == 1) {	1✔
184	syncContext.executeLater(reportTransportInUse);	1✔
185	}
186	for (ClientStreamTracer streamTracer : tracers) {	1✔
187	streamTracer.createPendingStream();	1✔
188	}
189	return pendingStream;	1✔
190	}
191
192	@Override
193	public final void ping(final PingCallback callback, Executor executor) {
194	throw new UnsupportedOperationException("This method is not expected to be called");	×
195	}
196
197	@Override
198	public ListenableFuture<SocketStats> getStats() {
199	SettableFuture<SocketStats> ret = SettableFuture.create();	×
200	ret.set(null);	×
201	return ret;	×
202	}
203
204	/**
205	* Prevents creating any new streams. Buffered streams are not failed and may still proceed
206	* when {@link #reprocess} is called. The delayed transport will be terminated when there is no
207	* more buffered streams.
208	*/
209	@Override
210	public final void shutdown(final Status status) {
211	synchronized (lock) {	1✔
212	if (shutdownStatus != null) {	1✔
213	return;	1✔
214	}
215	shutdownStatus = status;	1✔
216	syncContext.executeLater(new Runnable() {	1✔
217	@Override
218	public void run() {
219	listener.transportShutdown(status);	1✔
220	}	1✔
221	});
222	if (!hasPendingStreams() && reportTransportTerminated != null) {	1✔
223	syncContext.executeLater(reportTransportTerminated);	1✔
224	reportTransportTerminated = null;	1✔
225	}
226	}	1✔
227	syncContext.drain();	1✔
228	}	1✔
229
230	/**
231	* Shuts down this transport and cancels all streams that it owns, hence immediately terminates
232	* this transport.
233	*/
234	@Override
235	public final void shutdownNow(Status status) {
236	shutdown(status);	1✔
237	Collection<PendingStream> savedPendingStreams;
238	Runnable savedReportTransportTerminated;
239	synchronized (lock) {	1✔
240	savedPendingStreams = pendingStreams;	1✔
241	savedReportTransportTerminated = reportTransportTerminated;	1✔
242	reportTransportTerminated = null;	1✔
243	if (!pendingStreams.isEmpty()) {	1✔
244	pendingStreams = Collections.emptyList();	1✔
245	}
246	}	1✔
247	if (savedReportTransportTerminated != null) {	1✔
248	for (PendingStream stream : savedPendingStreams) {	1✔
249	Runnable runnable = stream.setStream(	1✔
250	new FailingClientStream(status, RpcProgress.REFUSED, stream.tracers));	1✔
251	if (runnable != null) {	1✔
252	// Drain in-line instead of using an executor as failing stream just throws everything
253	// away. This is essentially the same behavior as DelayedStream.cancel() but can be done
254	// before stream.start().
255	runnable.run();	1✔
256	}
257	}	1✔
258	syncContext.execute(savedReportTransportTerminated);	1✔
259	}
260	// If savedReportTransportTerminated == null, transportTerminated() has already been called in
261	// shutdown().
262	}	1✔
263
264	public final boolean hasPendingStreams() {
265	synchronized (lock) {	1✔
266	return !pendingStreams.isEmpty();	1✔
267	}
268	}
269
270	@VisibleForTesting
271	final int getPendingStreamsCount() {
272	synchronized (lock) {	1✔
273	return pendingStreams.size();	1✔
274	}
275	}
276
277	/**
278	* Use the picker to try picking a transport for every pending stream, proceed the stream if the
279	* pick is successful, otherwise keep it pending.
280	*
281	* <p>This method may be called concurrently with {@code newStream()}, and it's safe. All pending
282	* streams will be served by the latest picker (if a same picker is given more than once, they are
283	* considered different pickers) as soon as possible.
284	*
285	* <p>This method <strong>must not</strong> be called concurrently with itself.
286	*/
287	final void reprocess(@Nullable SubchannelPicker picker) {
288	ArrayList<PendingStream> toProcess;
289	synchronized (lock) {	1✔
290	lastPicker = picker;	1✔
291	lastPickerVersion++;	1✔
292	if (picker == null \|\| !hasPendingStreams()) {	1✔
293	return;	1✔
294	}
295	toProcess = new ArrayList<>(pendingStreams);	1✔
296	}	1✔
297	ArrayList<PendingStream> toRemove = new ArrayList<>();	1✔
298
299	for (final PendingStream stream : toProcess) {	1✔
300	PickResult pickResult = picker.pickSubchannel(stream.args);	1✔
301	CallOptions callOptions = stream.args.getCallOptions();	1✔
302	final ClientTransport transport = GrpcUtil.getTransportFromPickResult(pickResult,	1✔
303	callOptions.isWaitForReady());	1✔
304	if (transport != null) {	1✔
305	Executor executor = defaultAppExecutor;	1✔
306	// createRealStream may be expensive. It will start real streams on the transport. If
307	// there are pending requests, they will be serialized too, which may be expensive. Since
308	// we are now on transport thread, we need to offload the work to an executor.
309	if (callOptions.getExecutor() != null) {	1✔
310	executor = callOptions.getExecutor();	1✔
311	}
312	Runnable runnable = stream.createRealStream(transport);	1✔
313	if (runnable != null) {	1✔
314	executor.execute(runnable);	1✔
315	}
316	toRemove.add(stream);	1✔
317	} // else: stay pending
318	}	1✔
319
320	synchronized (lock) {	1✔
321	// Between this synchronized and the previous one:
322	// - Streams may have been cancelled, which may turn pendingStreams into emptiness.
323	// - shutdown() may be called, which may turn pendingStreams into null.
324	if (!hasPendingStreams()) {	1✔
325	return;	×
326	}
327	pendingStreams.removeAll(toRemove);	1✔
328	// Because delayed transport is long-lived, we take this opportunity to down-size the
329	// hashmap.
330	if (pendingStreams.isEmpty()) {	1✔
331	pendingStreams = new LinkedHashSet<>();	1✔
332	}
333	if (!hasPendingStreams()) {	1✔
334	// There may be a brief gap between delayed transport clearing in-use state, and first real
335	// transport starting streams and setting in-use state. During the gap the whole channel's
336	// in-use state may be false. However, it shouldn't cause spurious switching to idleness
337	// (which would shutdown the transports and LoadBalancer) because the gap should be shorter
338	// than IDLE_MODE_DEFAULT_TIMEOUT_MILLIS (1 second).
339	syncContext.executeLater(reportTransportNotInUse);	1✔
340	if (shutdownStatus != null && reportTransportTerminated != null) {	1✔
341	syncContext.executeLater(reportTransportTerminated);	1✔
342	reportTransportTerminated = null;	1✔
343	}
344	}
345	}	1✔
346	syncContext.drain();	1✔
347	}	1✔
348
349	@Override
350	public InternalLogId getLogId() {
351	return logId;	×
352	}
353
354	private class PendingStream extends DelayedStream {
355	private final PickSubchannelArgs args;
356	private final Context context = Context.current();	1✔
357	private final ClientStreamTracer[] tracers;
358
359	private PendingStream(PickSubchannelArgs args, ClientStreamTracer[] tracers) {	1✔
360	this.args = args;	1✔
361	this.tracers = tracers;	1✔
362	}	1✔
363
364	/** Runnable may be null. */
365	private Runnable createRealStream(ClientTransport transport) {
366	ClientStream realStream;
367	Context origContext = context.attach();	1✔
368	try {
369	realStream = transport.newStream(	1✔
370	args.getMethodDescriptor(), args.getHeaders(), args.getCallOptions(),	1✔
371	tracers);
372	} finally {
373	context.detach(origContext);	1✔
374	}
375	return setStream(realStream);	1✔
376	}
377
378	@Override
379	public void cancel(Status reason) {
380	super.cancel(reason);	1✔
381	synchronized (lock) {	1✔
382	if (reportTransportTerminated != null) {	1✔
383	boolean justRemovedAnElement = pendingStreams.remove(this);	1✔
384	if (!hasPendingStreams() && justRemovedAnElement) {	1✔
385	syncContext.executeLater(reportTransportNotInUse);	1✔
386	if (shutdownStatus != null) {	1✔
387	syncContext.executeLater(reportTransportTerminated);	1✔
388	reportTransportTerminated = null;	1✔
389	}
390	}
391	}
392	}	1✔
393	syncContext.drain();	1✔
394	}	1✔
395
396	@Override
397	protected void onEarlyCancellation(Status reason) {
398	for (ClientStreamTracer tracer : tracers) {	1✔
399	tracer.streamClosed(reason);	1✔
400	}
401	}	1✔
402
403	@Override
404	public void appendTimeoutInsight(InsightBuilder insight) {
405	if (args.getCallOptions().isWaitForReady()) {	1✔
406	insight.append("wait_for_ready");	1✔
407	}
408	super.appendTimeoutInsight(insight);	1✔
409	}	1✔
410	}
411	}

grpc / grpc-java / #18744

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