1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
/*
* Copyright 2010-2012 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, Inc. or its affiliates. All rights reserved.
*
* 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.amazon.carbonado.capability;
import java.io.Serializable;
import java.util.Collection;
import com.amazon.carbonado.Cursor;
import com.amazon.carbonado.Repository;
import com.amazon.carbonado.RepositoryException;
/**
* Defines a remote procedure which can be executed by {@link
* RemoteProcedureCapability}. Any data within the procedure instance is
* serialized to the remote host, and possibly the class definition
* too. Execution might have security restrictions applied.
*
* <p>The RemoteProcedure instance is Serializable, and so any serializable
* parameters can be passed with it. Storables and extra data can be sent
* through the {@link Request} object. Any data returned by procedure
* implementation must be sent through the {@link Reply} object.
*
* @param <R> reply object type
* @param <D> request data object type
* @author Brian S O'Neill
*/
public interface RemoteProcedure<R, D> extends Serializable {
/**
* Request handler for remote procedure implementation.
*
* @param repo repository as seen by host that procedure is running from
* @param request non-null request object
* @return false if request is still active when this method returns;
* request must eventually be explicitly finished
*/
boolean handleRequest(Repository repo, Request<R, D> request) throws RepositoryException;
/**
* Client-side call into a remote procedure. To avoid leaking resources,
* the finish method must be invoked or all reply data be fully read. If an
* exception is thrown by a method defined in this interface, resources are
* automatically released.
*
* @param <R> reply object type
* @param <D> request data object type
* @see RemoteProcedureCapability#beginCall
*/
public static interface Call<R, D> {
/**
* Send data to the remote procedure.
*
* @return this Call instance
* @throws IllegalArgumentException if data is null
* @throws IllegalStateException if a call has been executed
*/
Call<R, D> send(D data) throws RepositoryException;
/**
* Send all data from the given iterable to the remote procedure.
*
* @return this Call instance
* @throws IllegalArgumentException if data is null
* @throws IllegalStateException if a call has been executed
*/
Call<R, D> sendAll(Iterable<? extends D> iterable) throws RepositoryException;
/**
* Send all data from the given cursor to the remote procedure.
*
* @return this Call instance
* @throws IllegalArgumentException if data is null
* @throws IllegalStateException if a call has been executed
*/
Call<R, D> sendAll(Cursor<? extends D> cursor) throws RepositoryException;
/**
* Reset the internal object stream of the call, allowing cached
* objects to get freed.
*
* @return this Call instance
* @throws IllegalStateException if a call has been executed
*/
Call<R, D> reset() throws RepositoryException;
/**
* Flushes all the data sent so far. Flush is invoked automatically
* when call is executed.
*/
void flush() throws RepositoryException;
/**
* Executes the call and receive a reply. Calling this method does not
* block, but methods on the returned Cursor may block waiting for
* data.
*
* @throws IllegalStateException if a call has been executed
*/
Cursor<R> fetchReply() throws RepositoryException;
/**
* Executes the call without expecting a reply. Method blocks waiting
* for procedure to finish.
*
* @throws IllegalStateException if a call has been executed
*/
void execute() throws RepositoryException;
/**
* Executes the call without expecting a reply. Method does not block
* waiting for procedure to finish. Asynchronous execution is not
* allowed if the current thread is in a transaction. This is because
* transaction ownership becomes ambiguous.
*
* @throws IllegalStateException if a call has been executed or if
* current thread is in a transaction
*/
void executeAsync() throws RepositoryException;
}
/**
* Request into a remote procedure, as seen by procedure implementation. To
* avoid leaking resources, the request or reply object must always be
* finished. If an exception is thrown by a method defined in this
* interface, resources are automatically released.
*
* @param <R> reply object type
* @param <D> request data object type
*/
public static interface Request<R, D> {
/**
* Receive data from caller.
*
* @return null if no more data
*/
D receive() throws RepositoryException;
/**
* Receive all remaining data from caller.
*
* @param c collection to receive data
* @return amount received
*/
int receiveInto(Collection<? super D> c) throws RepositoryException;
/**
* Begin a reply after receiving all data. If no data is expected,
* reply can be made without calling receive.
*
* @throws IllegalStateException if reply was already begun, or if
* request is finished, or if more data must be received
*/
Reply<R> beginReply() throws RepositoryException;
/**
* Reply and immediately finish, without sending any data to caller.
*
* @throws IllegalStateException if a reply was already begun or if
* more data must be received
*/
void finish() throws RepositoryException;
}
/**
* Reply from remote procedure implementation. To avoid leaking resources,
* the finish method must always be invoked. If an exception is thrown by a
* method defined in this interface, resources are automatically released.
*
* @param <R> reply object type
*/
public static interface Reply<R> {
/**
* Send reply data to the caller.
*
* @return this Reply instance
* @throws IllegalStateException if reply is finished
*/
Reply<R> send(R data) throws RepositoryException;
/**
* Reply with all data from the given iterable to the caller.
*
* @return this Reply instance
* @throws IllegalStateException if reply is finished
*/
Reply<R> sendAll(Iterable<? extends R> iterable) throws RepositoryException;
/**
* Reply with all data from the given cursor to the caller.
*
* @return this Reply instance
* @throws IllegalStateException if reply is finished
*/
Reply<R> sendAll(Cursor<? extends R> cursor) throws RepositoryException;
/**
* Reset the internal object stream of the reply, allowing cached
* objects to get freed.
*
* @return this Reply instance
* @throws IllegalStateException if reply is finished
*/
Reply<R> reset() throws RepositoryException;
/**
* Flushes all the data sent so far. Flush is invoked automatically
* when reply is finished.
*/
void flush() throws RepositoryException;
/**
* Finish the reply.
*/
void finish() throws RepositoryException;
}
}
|
