21256

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Build # 21256

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cron

travis-ci

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dapengzhang0

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<a href="https://github.com/grpc/grpc-java/commit/0f572ae7f">bazel: Use https to download from Maven Central

This is a moral backport of
https://github.com/grpc/grpc-java/commit/</a><a class="double-link" href="https://github.com/grpc/grpc-java/commit/a4299eb6b">a4299eb6b</a>

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83.02

/core/src/main/java/io/grpc/internal/Http2Ping.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.base.Stopwatch;
import io.grpc.internal.ClientTransport.PingCallback;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.concurrent.Executor;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.concurrent.GuardedBy;

/**
 * Represents an outstanding PING operation on an HTTP/2 channel. This can be used by HTTP/2-based
 * transports to implement {@link ClientTransport#ping}.
 *
 * <p>A typical transport need only support one outstanding ping at a time. So, if a ping is
 * requested while an operation is already in progress, the given callback is notified when the
 * existing operation completes.
 */
public class Http2Ping {
  private static final Logger log = Logger.getLogger(Http2Ping.class.getName());

  /**
   * The PING frame includes 8 octets of payload data, e.g. 64 bits.
   */
  private final long data;

  /**
   * Used to measure elapsed time.
   */
  private final Stopwatch stopwatch;

  /**
   * The registered callbacks and the executor used to invoke them.
   */
  @GuardedBy("this") private Map<PingCallback, Executor> callbacks
      = new LinkedHashMap<>();

  /**
   * False until the operation completes, either successfully (other side sent acknowledgement) or
   * unsuccessfully.
   */
  @GuardedBy("this") private boolean completed;

  /**
   * If non-null, indicates the ping failed.
   */
  @GuardedBy("this") private Throwable failureCause;

  /**
   * The round-trip time for the ping, in nanoseconds. This value is only meaningful when
   * {@link #completed} is true and {@link #failureCause} is null.
   */
  @GuardedBy("this") private long roundTripTimeNanos;

  /**
   * Creates a new ping operation. The caller is responsible for sending a ping on an HTTP/2 channel
   * using the given payload. The caller is also responsible for starting the stopwatch when the
   * PING frame is sent.
   *
   * @param data the ping payload
   * @param stopwatch a stopwatch for measuring round-trip time
   */
  public Http2Ping(long data, Stopwatch stopwatch) {
    this.data = data;
    this.stopwatch = stopwatch;
  }

  /**
   * Registers a callback that is invoked when the ping operation completes. If this ping operation
   * is already completed, the callback is invoked immediately.
   *
   * @param callback the callback to invoke
   * @param executor the executor to use
   */
  public void addCallback(final ClientTransport.PingCallback callback, Executor executor) {
    Runnable runnable;
    synchronized (this) {
      if (!completed) {
        callbacks.put(callback, executor);
        return;
      }
      // otherwise, invoke callback immediately (but not while holding lock)
      runnable = this.failureCause != null ? asRunnable(callback, failureCause)
                                           : asRunnable(callback, roundTripTimeNanos);
    }
    doExecute(executor, runnable);
  }

  /**
   * Returns the expected ping payload for this outstanding operation.
   *
   * @return the expected payload for this outstanding ping
   */
  public long payload() {
    return data;
  }

  /**
   * Completes this operation successfully. The stopwatch given during construction is used to
   * measure the elapsed time. Registered callbacks are invoked and provided the measured elapsed
   * time.
   *
   * @return true if the operation is marked as complete; false if it was already complete
   */
  public boolean complete() {
    Map<ClientTransport.PingCallback, Executor> callbacks;
    long roundTripTimeNanos;
    synchronized (this) {
      if (completed) {
        return false;
      }
      completed = true;
      roundTripTimeNanos = this.roundTripTimeNanos = stopwatch.elapsed(TimeUnit.NANOSECONDS);
      callbacks = this.callbacks;
      this.callbacks = null;
    }
    for (Map.Entry<ClientTransport.PingCallback, Executor> entry : callbacks.entrySet()) {
      doExecute(entry.getValue(), asRunnable(entry.getKey(), roundTripTimeNanos));
    }
    return true;
  }

  /**
   * Completes this operation exceptionally. Registered callbacks are invoked and provided the
   * given throwable as the cause of failure.
   *
   * @param failureCause the cause of failure
   */
  public void failed(Throwable failureCause) {
    Map<ClientTransport.PingCallback, Executor> callbacks;
    synchronized (this) {
      if (completed) {
        return;
      }
      completed = true;
      this.failureCause = failureCause;
      callbacks = this.callbacks;
      this.callbacks = null;
    }
    for (Map.Entry<ClientTransport.PingCallback, Executor> entry : callbacks.entrySet()) {
      notifyFailed(entry.getKey(), entry.getValue(), failureCause);
    }
  }

  /**
   * Notifies the given callback that the ping operation failed.
   *
   * @param callback the callback
   * @param executor the executor used to invoke the callback
   * @param cause the cause of failure
   */
  public static void notifyFailed(PingCallback callback, Executor executor, Throwable cause) {
    doExecute(executor, asRunnable(callback, cause));
  }

  /**
   * Executes the given runnable. This prevents exceptions from propagating so that an exception
   * thrown by one callback won't prevent subsequent callbacks from being executed.
   */
  private static void doExecute(Executor executor, Runnable runnable) {
    try {
      executor.execute(runnable);
    } catch (Throwable th) {
      log.log(Level.SEVERE, "Failed to execute PingCallback", th);
    }
  }

  /**
   * Returns a runnable that, when run, invokes the given callback, providing the given round-trip
   * duration.
   */
  private static Runnable asRunnable(final ClientTransport.PingCallback callback,
                                     final long roundTripTimeNanos) {
    return new Runnable() {
      @Override
      public void run() {
        callback.onSuccess(roundTripTimeNanos);
      }
    };

  }

  /**
   * Returns a runnable that, when run, invokes the given callback, providing the given cause of
   * failure.
   */
  private static Runnable asRunnable(final ClientTransport.PingCallback callback,
                                     final Throwable failureCause) {
    return new Runnable() {
      @Override
      public void run() {
        callback.onFailure(failureCause);
      }
    };
  }
}

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.base.Stopwatch;
20	import io.grpc.internal.ClientTransport.PingCallback;
21	import java.util.LinkedHashMap;
22	import java.util.Map;
23	import java.util.concurrent.Executor;
24	import java.util.concurrent.TimeUnit;
25	import java.util.logging.Level;
26	import java.util.logging.Logger;
27	import javax.annotation.concurrent.GuardedBy;
28
29	/**
30	* Represents an outstanding PING operation on an HTTP/2 channel. This can be used by HTTP/2-based
31	* transports to implement {@link ClientTransport#ping}.
32	*
33	* <p>A typical transport need only support one outstanding ping at a time. So, if a ping is
34	* requested while an operation is already in progress, the given callback is notified when the
35	* existing operation completes.
36	*/
37	public class Http2Ping {
38	private static final Logger log = Logger.getLogger(Http2Ping.class.getName());	1✔
39
40	/**
41	* The PING frame includes 8 octets of payload data, e.g. 64 bits.
42	*/
43	private final long data;
44
45	/**
46	* Used to measure elapsed time.
47	*/
48	private final Stopwatch stopwatch;
49
50	/**
51	* The registered callbacks and the executor used to invoke them.
52	*/
53	@GuardedBy("this") private Map<PingCallback, Executor> callbacks	1✔
54	= new LinkedHashMap<>();
55
56	/**
57	* False until the operation completes, either successfully (other side sent acknowledgement) or
58	* unsuccessfully.
59	*/
60	@GuardedBy("this") private boolean completed;
61
62	/**
63	* If non-null, indicates the ping failed.
64	*/
65	@GuardedBy("this") private Throwable failureCause;
66
67	/**
68	* The round-trip time for the ping, in nanoseconds. This value is only meaningful when
69	* {@link #completed} is true and {@link #failureCause} is null.
70	*/
71	@GuardedBy("this") private long roundTripTimeNanos;
72
73	/**
74	* Creates a new ping operation. The caller is responsible for sending a ping on an HTTP/2 channel
75	* using the given payload. The caller is also responsible for starting the stopwatch when the
76	* PING frame is sent.
77	*
78	* @param data the ping payload
79	* @param stopwatch a stopwatch for measuring round-trip time
80	*/
81	public Http2Ping(long data, Stopwatch stopwatch) {	1✔
82	this.data = data;	1✔
83	this.stopwatch = stopwatch;	1✔
84	}	1✔
85
86	/**
87	* Registers a callback that is invoked when the ping operation completes. If this ping operation
88	* is already completed, the callback is invoked immediately.
89	*
90	* @param callback the callback to invoke
91	* @param executor the executor to use
92	*/
93	public void addCallback(final ClientTransport.PingCallback callback, Executor executor) {
94	Runnable runnable;
95	synchronized (this) {	1✔
96	if (!completed) {	1✔
97	callbacks.put(callback, executor);	1✔
98	return;	1✔
99	}
100	// otherwise, invoke callback immediately (but not while holding lock)
101	runnable = this.failureCause != null ? asRunnable(callback, failureCause)	×
102	: asRunnable(callback, roundTripTimeNanos);	×
103	}	×
104	doExecute(executor, runnable);	×
105	}	×
106
107	/**
108	* Returns the expected ping payload for this outstanding operation.
109	*
110	* @return the expected payload for this outstanding ping
111	*/
112	public long payload() {
113	return data;	1✔
114	}
115
116	/**
117	* Completes this operation successfully. The stopwatch given during construction is used to
118	* measure the elapsed time. Registered callbacks are invoked and provided the measured elapsed
119	* time.
120	*
121	* @return true if the operation is marked as complete; false if it was already complete
122	*/
123	public boolean complete() {
124	Map<ClientTransport.PingCallback, Executor> callbacks;
125	long roundTripTimeNanos;
126	synchronized (this) {	1✔
127	if (completed) {	1✔
128	return false;	×
129	}
130	completed = true;	1✔
131	roundTripTimeNanos = this.roundTripTimeNanos = stopwatch.elapsed(TimeUnit.NANOSECONDS);	1✔
132	callbacks = this.callbacks;	1✔
133	this.callbacks = null;	1✔
134	}	1✔
135	for (Map.Entry<ClientTransport.PingCallback, Executor> entry : callbacks.entrySet()) {	1✔
136	doExecute(entry.getValue(), asRunnable(entry.getKey(), roundTripTimeNanos));	1✔
137	}	1✔
138	return true;	1✔
139	}
140
141	/**
142	* Completes this operation exceptionally. Registered callbacks are invoked and provided the
143	* given throwable as the cause of failure.
144	*
145	* @param failureCause the cause of failure
146	*/
147	public void failed(Throwable failureCause) {
148	Map<ClientTransport.PingCallback, Executor> callbacks;
149	synchronized (this) {	1✔
150	if (completed) {	1✔
151	return;	×
152	}
153	completed = true;	1✔
154	this.failureCause = failureCause;	1✔
155	callbacks = this.callbacks;	1✔
156	this.callbacks = null;	1✔
157	}	1✔
158	for (Map.Entry<ClientTransport.PingCallback, Executor> entry : callbacks.entrySet()) {	1✔
159	notifyFailed(entry.getKey(), entry.getValue(), failureCause);	1✔
160	}	1✔
161	}	1✔
162
163	/**
164	* Notifies the given callback that the ping operation failed.
165	*
166	* @param callback the callback
167	* @param executor the executor used to invoke the callback
168	* @param cause the cause of failure
169	*/
170	public static void notifyFailed(PingCallback callback, Executor executor, Throwable cause) {
171	doExecute(executor, asRunnable(callback, cause));	1✔
172	}	1✔
173
174	/**
175	* Executes the given runnable. This prevents exceptions from propagating so that an exception
176	* thrown by one callback won't prevent subsequent callbacks from being executed.
177	*/
178	private static void doExecute(Executor executor, Runnable runnable) {
179	try {
180	executor.execute(runnable);	1✔
181	} catch (Throwable th) {	×
182	log.log(Level.SEVERE, "Failed to execute PingCallback", th);	×
183	}	1✔
184	}	1✔
185
186	/**
187	* Returns a runnable that, when run, invokes the given callback, providing the given round-trip
188	* duration.
189	*/
190	private static Runnable asRunnable(final ClientTransport.PingCallback callback,
191	final long roundTripTimeNanos) {
192	return new Runnable() {	1✔
193	@Override
194	public void run() {
195	callback.onSuccess(roundTripTimeNanos);	1✔
196	}	1✔
197	};
198
199	}
200
201	/**
202	* Returns a runnable that, when run, invokes the given callback, providing the given cause of
203	* failure.
204	*/
205	private static Runnable asRunnable(final ClientTransport.PingCallback callback,
206	final Throwable failureCause) {
207	return new Runnable() {	1✔
208	@Override
209	public void run() {
210	callback.onFailure(failureCause);	1✔
211	}	1✔
212	};
213	}
214	}

grpc / grpc-java / 21256

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